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80 lines
2.6 KiB
Groff
80 lines
2.6 KiB
Groff
.TH VGCREATE 8 "LVM TOOLS" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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vgcreate \- create a volume group
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.SH SYNOPSIS
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.B vgcreate
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.RB [ \-A | \-\-autobackup " {" y | n }]
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.RB [ \-d | \-\-debug ]
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.RB [ \-h | \-\-help ]
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.RB [ \-l | \-\-maxlogicalvolumes
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.IR MaxLogicalVolumes ]
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.RB [ -p | \-\-maxphysicalvolumes
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.IR MaxPhysicalVolumes ]
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.RB [ \-s | \-\-physicalextentsize
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.IR PhysicalExtentSize [ \fBkKmMgGtT\fR ]]
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.RB [ \-v | \-\-verbose ]
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.RB [ \-\-version ]
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.I VolumeGroupName PhysicalVolumePath
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.RI [ PhysicalVolumePath ...]
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.SH DESCRIPTION
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.B vgcreate
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creates a new volume group called
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.I VolumeGroupName
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using the block special device
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.IR PhysicalVolumePath
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previously configured for LVM with
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.BR pvcreate (8).
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.SH OPTIONS
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See \fBlvm\fP for common options.
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.TP
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.BR \-A ", " \-\-autobackup " {" y | n }
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Controls automatic backup of VG metadata after the change (see
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.BR vgcfgbackup (8)).
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Default is yes.
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.TP
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.BR \-l ", " \-\-maxlogicalvolumes " " \fIMaxLogicalVolumes\fR
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Sets the maximum possible logical volume count.
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More logical volumes can't be created in this volume group.
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Absolute maximum is 256.
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.TP
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.BR \-p ", " \-\-maxphysicalvolumes " " \fIMaxPhysicalVolumes\fR
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Sets the maximum possible physical volume count.
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More physical volumes can't be included in this volume group.
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Absolute maximum is 256.
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.TP
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.BR \-s ", " \-\-physicalextentsize " " \fIPhysicalExtentSize\fR[\fBkKmMgGtT\fR]
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Sets the physical extent size on physical volumes of this volume group.
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A size suffix (k for kilobytes up to t for terabytes) is optional, megabytes
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is the default if no suffix is present. Values can be from 8 KB to 16 GB in
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powers of 2. The default of 4 MB causes maximum LV sizes of ~256GB because as
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many as ~64k extents are supported per LV. In case larger maximum LV sizes are
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needed (later), you need to set the PE size to a larger value as well. Later
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changes of the PE size in an existing VG are not supported.
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.SH EXAMPLES
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To create a volume group named
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.B test_vg
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using physical volumes
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.BR /dev/hdk1 ", " /dev/hdl1 ", and " /dev/hdm1
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with default physical extent size of 4MB:
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.nf
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\ vgcreate test_vg /dev/sd[k-m]1
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.fi
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To limit kernel memory usage, there is a limit of 65536 physical extents
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(PE) per logical volume, so the PE size determines the maximum logical volume
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size. The default PE size of 4MB limits a single logical volume to 256GB (see
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the -s option to raise that limit).
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There is also (as of Linux 2.4) a kernel limitation of 2TB per block device.
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.SH SEE ALSO
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.BR lvm (8),
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.BR pvdisplay (8),
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.BR pvcreate (8),
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.BR vgdisplay (8),
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.BR vgextend (8),
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.BR vgreduce (8),
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.BR lvcreate (8),
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.BR lvdisplay (8),
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.BR lvextend (8),
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.BR lvreduce (8)
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