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https://github.com/ceph/ceph
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51 lines
1.6 KiB
Groff
51 lines
1.6 KiB
Groff
.TH OSDMAPTOOL 8
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.SH NAME
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osdmaptool \- ceph osd cluster map manipulation tool
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.SH SYNOPSIS
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.B osdmaptool
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\fImapfilename\fP
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[\fB\-\-print\fR]
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[\fB\-\-createsimple \fInumosd\fR [\fB\-\-pgbits \fIbitsperosd\fR]]
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[\fB\-\-clobber\fR]
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.SH DESCRIPTION
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.B osdmaptool
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is a utility that lets you create, view, and manipulate OSD cluster maps from the
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Ceph distributed file system. Notably, it lets you extract the embedded CRUSH map
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or import a new CRUSH map.
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.SH OPTIONS
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.TP
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\fB\-\-print\fP
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will simply make the tool print a plaintext dump of the map, after any modifications are made.
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.TP
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\fB\-\-clobber\fP
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will allow
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.B osdmaptool
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to overwrite \fImapfilename\fP if changes are made.
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.TP
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\fB\-\-import-crush\fI mapfile\fP
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will load the CRUSH map from \fImapfile\fP and embed it in the OSD map.
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.TP
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\fB\-\-export-crush\fI mapfile\fP
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will extract the CRUSH map from the OSD map and write it to \fImapfile\fP.
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.TP
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\fB\-\-createsimple\fI numosd\fP [\fB\-\-pgbits \fIbitsperosd\fR]
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will create a relatively generic OSD map with the \fInumosd\fP devices. If \fB\-\-pgbits\fP
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is specified, the initial placement group counts will be set with \fIbitsperosd\fP bits per OSD.
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That is, the \fIpg_num\fP map attribute will be set to \fInumosd\fP shifted by \fIbitsperosd\fP.
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.SH EXAMPLE
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To create a simple map with 16 devices:
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.IP
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osdmaptool --createsimple 16 osdmap --clobber
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.PP
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To view the result:
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.IP
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osdmaptool --print osdmap
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.SH AVAILABILITY
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.B osdmaptool
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is part of the Ceph distributed file system. Please refer to the Ceph wiki at
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http://ceph.newdream.net/wiki for more information.
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.SH SEE ALSO
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.BR ceph (8),
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.BR crushtool (8),
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.BR mkcephfs (8)
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