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git-svn-id: https://ceph.svn.sf.net/svnroot/ceph@2100 29311d96-e01e-0410-9327-a35deaab8ce9
49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
OBJECT STORE ON BERKELEY DB
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---------------------------
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OSBDB is an implementation of an object store that uses Berkeley DB as
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the underlying storage. It is meant to be an alternative to EBOFS.
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BUILDING
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--------
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You will need to have Berkeley DB installed, including the developent
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packages. We've tested this with Berkeley DB 4.4.20 on Ubuntu 6.10.
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To compile OSBDB support, you need to pass the argument "want_bdb=yes"
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to "make." If you don't specify this, OSBDB and all its associated
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support is not included in the executables.
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RUNNING
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-------
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To use OSBDB in Ceph, simply pass the --bdbstore flag to programs. You
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don't need to create a "device" for OSBDB ahead of time; Berkeley DB
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will take care of creating the files. You also *cannot* use a raw
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device as your store -- it must be regular file.
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OSBDB additionally accepts the following flags:
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--bdbstore-btree Configures OSBDB to use the "Btree"
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database type for Berkeley DB. The default
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database type is "Hash".
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--bdbstore-hash-ffactor Sets the "fill factor" for the hash
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database type. Takes an integer argument.
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--bdbstore-hash-nelem Sets the "nelem" parameter for the hash
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database type. Takes an integer argument.
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--bdbstore-hash-pagesize Sets the page size for the hash database
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type. Takes an integer argument.
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--bdbstore-cachesize Sets the cache size. Takes an integer
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argument, which must be a power of two, and
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no less than 20 KiB.
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--bdbstore-transactional Enable (in-memory-only) transactions for
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all operations in the OSBDB store.
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--debug-bdbstore Set the debug level. Takes an integer
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argument.
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