mirror of https://github.com/schoebel/mars
571 lines
20 KiB
Plaintext
571 lines
20 KiB
Plaintext
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\begin{verbatim}
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Thorough documentation is in mars-manual.pdf. Please use the PDF manual
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as authoritative reference! Here is only a short summary of the most
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important sub-commands / options:
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marsadm [<global_options>] <command> [<resource_name> | all | <args> ]
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marsadm [<global_options>] view[-<macroname>] [<resource_name> | all ]
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<global_option> =
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--force
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Skip safety checks.
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Use this only when you really know what you are doing!
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Warning! This is dangerous! First try --dry-run.
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Not combinable with 'all'.
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--dry-run
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Don't modify the symlink tree, but tell what would be done.
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Use this before starting potentially harmful actions such as
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'delete-resource'.
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--verbose
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Increase speakyness of some commands.
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--logger=/path/to/usr/bin/logger
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Use an alternative syslog messenger.
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When empty, disable syslogging.
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--max-deletions=<number>
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When your network or your firewall rules are defective over a
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longer time, too many deletion links may accumulate at
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/mars/todo-global/delete-* and sibling locations.
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This limit is preventing overflow of the filesystem as well
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as overloading the worker threads.
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--thresh-logfiles=<number>
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--thresh-logsize=<number>
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Prevention of too many small logfiles when secondaries are not
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catching up. When more than thresh-logfiles are already present,
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the next one is only created when the last one has at least
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size thresh-logsize (in units of GB).
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--timeout=<seconds>
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Abort safety checks after timeout with an error.
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When giving 'all' as resource agument, this works for each
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resource independently.
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--window=<seconds>
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Treat other cluster nodes as healthy when some communcation has
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occured during the given time window.
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--threshold=<bytes>
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Some macros like 'fetch-threshold-reached' use this for determining
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their sloppyness.
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--host=<hostname>
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Act as if the command was running on cluster node <hostname>.
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Warning! This is dangerous! First try --dry-run
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--backup-dir=</absolute_path>
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Only for experts.
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Used by several special commands like merge-cluster, split-cluster
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etc for creating backups of important data.
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--ip=<ip>
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Override the IP address stored in the symlink tree, as well as
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the default IP determined from the list of network interfaces.
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Usually you will need this only at 'create-cluster' or
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'join-cluster' for resolving ambiguities.
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--ssh-port=<port_nr>
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Override the default ssh port (22) for ssh and rsync.
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Useful for running {join,merge}-cluster on non-standard ssh ports.
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--ssh-opts="<ssh_commandline_options>"
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Override the default ssh commandline options. Also used for rsync.
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--macro=<text>
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Handy for testing short macro evaluations at the command line.
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<command> =
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attach
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usage: attach <resource_name>
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Attaches the local disk (backing block device) to the resource.
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The disk must have been previously configured at
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{create,join}-resource.
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When designated as a primary, /dev/mars/$res will also appear.
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This does not change the state of {fetch,replay}.
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For a complete local startup of the resource, use 'marsadm up'.
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cat
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usage: cat <path>
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Print internal debug output in human readable form.
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Numerical timestamps and numerical error codes are replaced
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by more readable means.
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Example: marsadm cat /mars/5.total.status
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connect
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usage: connect <resource_name>
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See resume-fetch-local.
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connect-global
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usage: connect-global <resource_name>
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Like resume-fetch-local, but affects all resource members
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in the cluster (remotely).
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connect-local
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usage: connect-local <resource_name>
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See resume-fetch-local.
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create-cluster
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usage: create-cluster (no parameters)
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This must be called exactly once when creating a new cluster.
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Don't call this again! Use join-cluster on the secondary nodes.
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Please read the PDF manual for details.
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create-resource
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usage: create-resource <resource_name> </dev/lv/mydata>
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(further syntax variants are described in the PDF manual).
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Create a new resource out of a pre-existing disk (backing
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block device) /dev/lv/mydata (or similar).
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The current node will start in primary role, thus
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/dev/mars/<resource_name> will appear after a short time, initially
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showing the same contents as the underlying disk /dev/lv/mydata.
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It is good practice to name the resource <resource_name> and the
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disk name identical.
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cron
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usage: cron (no parameters)
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Do all necessary regular housekeeping tasks.
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This is equivalent to log-rotate all; sleep 5; log-delete-all all.
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delete-resource
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usage: delete-resource <resource_name>
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CAUTION! This is dangerous when the network is somehow
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interrupted, or when damaged nodes are later re-surrected
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in any way.
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Precondition: the resource must no longer have any members
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(see leave-resource).
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This is only needed when you _insist_ on re-using a damaged
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resource for re-creating a new one with exactly the same
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old <resource_name>.
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HINT: best practice is to not use this, but just create a _new_
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resource with a new <resource_name> out of your local disks.
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Please read the PDF manual on potential consequences.
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detach
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usage: detach <resource_name>
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Detaches the local disk (backing block device) from the
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MARS resource.
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Caution! you may read data from the local disk afterwards,
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but ensure that no data is written to it!
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Otherwise, you are likely to produce harmful inconsistencies.
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When running in primary role, /dev/mars/$res will also disappear.
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This does not change the state of {fetch,replay}.
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For a complete local shutdown of the resource, use 'marsadm down'.
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disconnect
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usage: disconnect <resource_name>
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See pause-fetch-local.
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disconnect-global
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usage: disconnect-global <resource_name>
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Like pause-fetch-local, but affects all resource members
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in the cluster (remotely).
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disconnect-local
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usage: disconnect-local <resource_name>
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See pause-fetch-local.
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down
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usage: down <resource_name>
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Shortcut for detach + pause-sync + pause-fetch + pause-replay.
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get-emergency-limit
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usage: get-emergency-limit <resource_name>
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Counterpart of set-emergency-limit (per-resource emergency limit)
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get-sync-limit-value
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usage: get-sync-limit-value (no parameters)
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For retrieval of the value set by set-sync-limit-value.
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get-systemd-unit
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usage: get-systemd-unit <resource_name>
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Show the system units (for start and stop), or empty when unset.
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invalidate
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usage: invalidate <resource_name>
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Only useful on a secondary node.
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Forces MARS to consider the local replica disk as being
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inconsistent, and therefore starting a fast full-sync from
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the currently designated primary node (which must exist;
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therefore avoid the 'secondary' command).
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This is usually needed for resolving emergency mode.
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When having k=2 replicas, this can be also used for
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quick-and-simple split-brain resolution.
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In other cases, or when the split-brain is not resolved by
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this command, please use the 'leave-resource' / 'join-resource'
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method as described in the PDF manual (in the right order as
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described there).
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join-cluster
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usage: join-cluster <hostname_of_primary>
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Establishes a new cluster membership.
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This must be called once on any new cluster member.
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This is a prerequisite for join-resource.
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join-resource
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usage: join-resource <resource_name> </dev/lv/mydata>
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(further syntax variants are described in the PDF manual).
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The resource <resource_name> must have been already created on
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another cluster node, and the network must be healthy.
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The contents of the local replica disk /dev/lv/mydata will be
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overwritten by the initial fast full sync from the currently
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designated primary node.
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After the initial full sync has finished, the current host will
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act in secondary role.
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For details on size constraints etc, refer to the PDF manual.
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leave-cluster
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usage: leave-cluster (no parameters)
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This can be used for final deconstruction of a cluster member.
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Prior to this, all resources must have been left
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via leave-resource.
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Notice: this will never destroy the cluster UID on the /mars/
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filesystem.
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Please read the PDF manual for details.
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leave-resource
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usage: leave-resource <resource_name>
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Precondition: the local host must be in secondary role.
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Stop being a member of the resource, and thus stop all
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replication activities. The status of the underlying disk
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will remain in its current state (whatever it is).
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log-delete
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usage: log-delete <resource_name>
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When possible, globally delete all old transaction logfiles which
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are known to be superflous, i.e. all secondaries no longer need
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to replay them.
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This must be regularly called by a cron job or similar, in order
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to prevent overflow of the /mars/ directory.
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For regular maintainance cron jobs, please prefer 'marsadm cron'.
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For details and best practices, please refer to the PDF manual.
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log-delete-all
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usage: log-delete-all <resource_name>
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Alias for log-delete
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log-delete-one
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usage: log-delete-one <resource_name>
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When possible, globally delete at most one old transaction logfile
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which is known to be superfluous, i.e. all secondaries no longer
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need to replay it.
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Hint: use this only for testing and manual inspection.
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For regular maintainance cron jobs, please prefer cron
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or log-delete-all.
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log-purge-all
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usage: log-purge-all <resource_name>
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This is potentially dangerous.
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Use this only if you are really desperate in trying to resolve a
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split brain. Use this only after reading the PDF manual!
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log-rotate
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usage: log-rotate <resource_name>
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Only useful at the primary side.
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Start writing transaction logs into a new transaction logfile.
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This should be regularly called by a cron job or similar.
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For regular maintainance cron jobs, please prefer 'marsadm cron'.
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For details and best practices, please refer to the PDF manual.
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lowlevel-delete-host
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usage: lowlevel-delete-host <resource_name>
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Delete cluster member.
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lowlevel-ls-host-ips
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usage: lowlevel-ls-host-ips <resource_name>
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List cluster member names and IP addresses.
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lowlevel-set-host-ip
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usage: lowlevel-set-host-ip <resource_name>
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Set IP for host.
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merge-cluster
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usage: merge-cluster <hostname_of_other_cluster>
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Precondition: the resource names of both clusters must be disjoint.
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Create the union of two clusters, consisting of the
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union of all machines, and the union of all resources.
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The members of each resource are _not_ changed by this.
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This is useful for creating a big "virtual LVM cluster" where
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resources can be almost arbitrarily migrated between machines via
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later join-resource / leave-resource operations.
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merge-cluster-check
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usage: merge-cluster-check <hostname_of_other_cluster>
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Check whether the resources of both clusters are disjoint.
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Useful for checking in advance whether merge-cluster would be
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possible.
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merge-cluster-list
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usage: merge-cluster-list
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Determine the local list of resources.
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Useful for checking or analysis of merge-cluster disjointness by hand.
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pause-fetch
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usage: pause-fetch <resource_name>
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See pause-fetch-local.
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pause-fetch-global
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usage: pause-fetch-global <resource_name>
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Like pause-fetch-local, but affects all resource members
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in the cluster (remotely).
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pause-fetch-local
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usage: pause-fetch-local <resource_name>
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Stop fetching transaction logfiles from the current
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designated primary.
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This is independent from any {pause,resume}-replay operations.
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Only useful on a secondary node.
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pause-replay
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usage: pause-replay <resource_name>
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See pause-replay-local.
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pause-replay-global
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usage: pause-replay-global <resource_name>
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Like pause-replay-local, but affects all resource members
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in the cluster (remotely).
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pause-replay-local
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usage: pause-replay-local <resource_name>
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Stop replaying transaction logfiles for now.
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This is independent from any {pause,resume}-fetch operations.
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This may be used for freezing the state of your replica for some
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time, if you have enough space on /mars/.
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Only useful on a secondary node.
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pause-sync
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usage: pause-sync <resource_name>
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See pause-sync-local.
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pause-sync-global
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usage: pause-sync-global <resource_name>
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Like pause-sync-local, but affects all resource members
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in the cluster (remotely).
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pause-sync-local
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usage: pause-sync-local <resource_name>
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Pause the initial data sync at current stage.
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This has only an effect if a sync is actually running (i.e.
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there is something to be actually synced).
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Don't pause too long, because the local replica will remain
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inconsistent during the pause.
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Use this only for limited reduction of system load.
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Only useful on a secondary node.
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primary
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usage: primary <resource_name>
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Promote the resource into primary role.
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This is necessary for /dev/mars/$res to appear on the local host.
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Notice: by concept there can be only _one_ designated primary
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in a cluster at the same time.
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The role change is automatically distributed to the other nodes
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in the cluster, provided that the network is healthy.
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The old primary node will _automatically_ go
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into secondary role first. This is different from DRBD!
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With MARS, you don't need an intermediate 'secondary' command
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for switching roles.
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It is usually better to _directly_ switch the primary roles
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between both hosts.
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When --force is not given, a planned handover is started:
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the local host will only become actually primary _after_ the
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old primary is gone, and all old transaction logs have been
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fetched and replayed at the new designated priamry.
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When --force is given, no handover is attempted. A a consequence,
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a split brain situation is likely to emerge.
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Thus, use --force only after an ordinary handover attempt has
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failed, and when you don't care about the split brain.
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For more details, please refer to the PDF manual.
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resize
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usage: resize <resource_name>
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Prerequisite: all underlying disks (usually /dev/vg/$res) must
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have been already increased, e.g. at the LVM layer (cf. lvresize).
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Causes MARS to re-examine all sizing constraints on all members of
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the resource, and increase the global logical size of the resource
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accordingly.
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Shrinking is currently not yet implemented.
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When successful, /dev/mars/$res at the primary will be increased
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in size. In addition, all secondaries will start an incremental
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fast full-sync to get the enlarged parts from the primary.
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resume-fetch
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usage: resume-fetch <resource_name>
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See resume-fetch-local.
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resume-fetch-global
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usage: resume-fetch-global <resource_name>
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Like resume-fetch-local, but affects all resource members
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in the cluster (remotely).
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resume-fetch-local
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usage: resume-fetch-local <resource_name>
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Start fetching transaction logfiles from the current
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designated primary node, if there is one.
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This is independent from any {pause,resume}-replay operations.
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Only useful on a secondary node.
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resume-replay
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usage: resume-replay <resource_name>
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See resume-replay-local.
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resume-replay-global
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usage: resume-replay-global <resource_name>
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Like resume-replay-local, but affects all resource members
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in the cluster (remotely).
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resume-replay-local
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usage: resume-replay-local <resource_name>
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Restart replaying transaction logfiles, when there is some
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data left.
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This is independent from any {pause,resume}-fetch operations.
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This should be used for unfreezing the state of your local replica.
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Only useful on a secondary node.
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resume-sync
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usage: resume-sync <resource_name>
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See resume-sync-local.
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resume-sync-global
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usage: resume-sync-global <resource_name>
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Like resume-sync-local, but affects all resource members
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in the cluster (remotely).
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resume-sync-local
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usage: resume-sync-local <resource_name>
|
||
|
Resume any initial / incremental data sync at the stage where it
|
||
|
had been interrupted by pause-sync.
|
||
|
Only useful on a secondary node.
|
||
|
|
||
|
secondary
|
||
|
usage: secondary <resource_name>
|
||
|
Promote all cluster members into secondary role, globally.
|
||
|
In contrast to DRBD, this is not needed as an intermediate step
|
||
|
for planned handover between an old and a new primary node.
|
||
|
The only reasonable usage is before the last leave-resource of the
|
||
|
last cluster member, immediately before leave-cluster is executed
|
||
|
for final deconstruction of the cluster.
|
||
|
In all other cases, please prefer 'primary' for direct handover
|
||
|
between cluster nodes.
|
||
|
Notice: 'secondary' sets the global designated primary node
|
||
|
to '(none)' which in turn prevents the execution of 'invalidate'
|
||
|
or 'join-resource' or 'resize' anywhere in the cluster.
|
||
|
Therefore, don't unnecessarily give 'secondary'!
|
||
|
|
||
|
set-emergency-limit
|
||
|
usage: set-emergency-limit <resource_name> <value>
|
||
|
Set a per-resource emergency limit for disk space in /mars.
|
||
|
See PDF manual for details.
|
||
|
|
||
|
set-sync-limit-value
|
||
|
usage: set-sync-limit-value <new_value>
|
||
|
Set the maximum number of resources which should by syncing
|
||
|
concurrently.
|
||
|
|
||
|
set-systemd-unit
|
||
|
usage: set-systemd-unit <resource_name> <start_unit_name> [<stop_unit_name>]
|
||
|
This activates the systemd template engine of marsadm.
|
||
|
Please read mars-manual.pdf on this.
|
||
|
When <stop_unit_name> is omitted, it will be treated equal to
|
||
|
<start_unit_name>.
|
||
|
|
||
|
split-cluster
|
||
|
usage: split-cluster (no parameters)
|
||
|
NOT OFFICIALLY SUPPORTED - ONLY FOR EXPERTS.
|
||
|
RTFS = Read The Fucking Sourcecode.
|
||
|
Use this only if you know what you are doing.
|
||
|
|
||
|
up
|
||
|
usage: up <resource_name>
|
||
|
Shortcut for attach + resume-sync + resume-fetch + resume-replay.
|
||
|
|
||
|
wait-cluster
|
||
|
usage: wait-resource [<resource_name>]
|
||
|
Waits until a ping-pong communication has succeeded in the
|
||
|
whole cluster (or only the members of <resource_name>).
|
||
|
NOTICE: this is extremely useful for avoiding races when scripting
|
||
|
in a cluster.
|
||
|
|
||
|
wait-connect
|
||
|
usage: wait-connect [<resource_name>]
|
||
|
See wait-cluster.
|
||
|
|
||
|
wait-resource
|
||
|
usage: wait-resource <resource_name>
|
||
|
[[attach|fetch|replay|sync][-on|-off]]
|
||
|
Wait until the given condition is met on the resource, locally.
|
||
|
|
||
|
wait-umount
|
||
|
usage: wait-umount <resource_name>
|
||
|
Wait until /dev/mars/<resource_name> has disappeared in the
|
||
|
cluster (even remotely).
|
||
|
Useful on both primary and secondary nodes.
|
||
|
|
||
|
<resource_name> = name of resource or "all" for all resources
|
||
|
|
||
|
|
||
|
<macroname> = <complex_macroname> | <primitive_macroname>
|
||
|
|
||
|
<complex_macroname> =
|
||
|
1and1
|
||
|
comminfo
|
||
|
commstate
|
||
|
cstate
|
||
|
default
|
||
|
default-global
|
||
|
diskstate
|
||
|
diskstate-1and1
|
||
|
dstate
|
||
|
fetch-line
|
||
|
fetch-line-1and1
|
||
|
flags
|
||
|
flags-1and1
|
||
|
outdated-flags
|
||
|
outdated-flags-1and1
|
||
|
primarynode
|
||
|
primarynode-1and1
|
||
|
replay-line
|
||
|
replay-line-1and1
|
||
|
replinfo
|
||
|
replinfo-1and1
|
||
|
replstate
|
||
|
replstate-1and1
|
||
|
resource-errors
|
||
|
resource-errors-1and1
|
||
|
role
|
||
|
role-1and1
|
||
|
state
|
||
|
status
|
||
|
sync-line
|
||
|
sync-line-1and1
|
||
|
syncinfo
|
||
|
syncinfo-1and1
|
||
|
todo-role
|
||
|
|
||
|
|
||
|
<primitive_macroname> =
|
||
|
deletable-size
|
||
|
device-opened
|
||
|
errno-text
|
||
|
Convert errno numbers (positive or negative) into human readable text.
|
||
|
get-log-status
|
||
|
get-resource-{fat,err,wrn}{,-count}
|
||
|
get-{disk,device}
|
||
|
is-{alive}
|
||
|
is-{split-brain,consistent,emergency}
|
||
|
occupied-size
|
||
|
present-{disk,device}
|
||
|
(deprecated, use *-present instead)
|
||
|
replay-basenr
|
||
|
replay-code
|
||
|
When negative, this indidates that a replay/recovery error has occurred.
|
||
|
rest-space
|
||
|
summary-vector
|
||
|
systemd-unit
|
||
|
tree
|
||
|
uuid
|
||
|
wait-{is,todo}-{attach,sync,fetch,replay,primary}-{on,off}
|
||
|
{alive,fetch,replay,work}-{timestamp,age,lag}
|
||
|
{all,the}-{pretty-,}{global-,}{{err,wrn,inf}-,}msg
|
||
|
{cluster,resource}-members
|
||
|
{disk,device}-present
|
||
|
{disk,resource,device}-size
|
||
|
{fetch,replay,work}-{lognr,logcount}
|
||
|
{get,actual}-primary
|
||
|
{is,todo}-{attach,sync,fetch,replay,primary}
|
||
|
{my,all}-resources
|
||
|
{sync,fetch,replay,work,syncpos}-{size,pos}
|
||
|
{sync,fetch,replay,work}-{rest,{almost-,threshold-,}reached,percent,permille,vector}
|
||
|
{sync,fetch,replay}-{rate,remain}
|
||
|
{time,real-time}
|
||
|
\end{verbatim}
|