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120 lines
3.2 KiB
Groff
120 lines
3.2 KiB
Groff
.TH "CEPHFS" "8" "September 22, 2011" "dev" "Ceph"
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.SH NAME
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cephfs \- ceph file system options utility
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.\" Man page generated from reStructeredText.
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.
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.SH SYNOPSIS
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.nf
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\fBcephfs\fP [ \fIpath\fP \fIcommand\fP \fIoptions\fP ]
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.fi
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.sp
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.SH DESCRIPTION
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.sp
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\fBcephfs\fP is a control utility for accessing and manipulating file
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layout and location data in the Ceph distributed file system.
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.sp
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Choose one of the following three commands:
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.INDENT 0.0
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.IP \(bu 2
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\fBshow_layout\fP View the layout information on a file or directory
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.IP \(bu 2
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\fBset_layout\fP Set the layout information on a file or directory
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.IP \(bu 2
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\fBshow_location\fP View the location information on a file
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.UNINDENT
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.SH OPTIONS
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.sp
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Your applicable options differ depending on whether you are setting or viewing layout/location.
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.SS Viewing options:
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.INDENT 0.0
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.TP
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.B \-l \-\-offset
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Specify an offset for which to retrieve location data
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.UNINDENT
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.SS Setting options:
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.INDENT 0.0
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.TP
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.B \-u \-\-stripe_unit
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Set the size of each stripe
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-c \-\-stripe_count
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Set the number of stripes per object
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-s \-\-object_size
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Set the size of the objects to stripe across
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-p \-\-pool
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Set the pool (by numeric value, not name!) to use
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-o \-\-osd
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Set the preferred OSD to use as the primary
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.UNINDENT
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.SH LIMITATIONS
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.sp
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When setting layout data, the specified stripe unit and stripe count
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must multiply to the size of an object. Any parameters you don\(aqt set
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explicitly are left at the system defaults.
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.sp
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Obviously setting the layout of a file and a directory means different
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things. Setting the layout of a file specifies exactly how to place
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the individual file. This must be done before writing \fIany\fP data to
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it. Truncating a file does not allow you to change the layout either.
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.sp
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Setting the layout of a directory sets the "default layout", which is
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used to set the file layouts on any files subsequently created in the
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directory (or any subdirectory). Pre\-existing files do not have their
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layouts changed.
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.sp
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You\(aqll notice that the layout information allows you to specify a
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preferred OSD for placement. This is allowed but is not recommended
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since it can dramatically unbalance your storage cluster\(aqs space
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utilization.
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.SH AVAILABILITY
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.sp
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\fBcephfs\fP is part of the Ceph distributed file system. Please refer
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to the Ceph wiki at \fI\%http://ceph.newdream.net/wiki\fP for more
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information.
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.SH SEE ALSO
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.sp
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\fBceph\fP(8)
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.SH COPYRIGHT
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2011, New Dream Network
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.\" Generated by docutils manpage writer.
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.\"
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