lvcreate

NAME

lvcreate - create a logical volume in an existing volume group

SYNOPSIS

lvcreate [--addtag Tag] [--alloc AllocationPolicy] [-A/--autobackup y/n] [-C/--contiguous y/n] [-d/--debug] [-h/-?/--help] [-i/--stripes Stripes [-I/--stripesize StripeSize]] {-l/--extents LogicalExtentsNumber |
-L/--size LogicalVolumeSize[kKmMgGtT]} [-M/--persistent y/n] [--minor minor] [-n/--name LogicalVolumeName] [-p/--permission r/rw] [-r/--readahead ReadAheadSectors] [-R|--regionsize MirrorLogRegionSize] [-t/--test] [-v/--verbose] [-Z/--zero y/n] VolumeGroupName [PhysicalVolumePath...]

lvcreate {-l/--extents LogicalExtentsNumber |
-L/--size LogicalVolumeSize[kKmMgGtT]} [-c/--chunksize ChunkSize] -s/--snapshot -n/--name SnapshotLogicalVolumeName OriginalLogicalVolumePath

DESCRIPTION

lvcreate creates a new logical volume in a volume group ( see vgcreate(8), vgchange(8) ) by allocating logical extents from the free physical extent pool of that volume group. If there are not enough free physical extents then the volume group can be extended ( see vgextend(8) ) with other physical volumes or by reducing existing logical volumes of this volume group in size ( see lvreduce(8) ).
The second form supports the creation of snapshot logical volumes which keep the contents of the original logical volume for backup purposes.

OPTIONS

See lvm for common options.

-c, --chunksize ChunkSize
	Power of 2 chunk size for the snapshot logical volume between 4k and 512k.
-C, --contiguous y/n
	Sets or resets the contiguous allocation policy for logical volumes. Default is no contiguous allocation based on a next free principle.
-i, --stripes Stripes
	Gives the number of stripes. This is equal to the number of physical volumes to scatter the logical volume.
-I, --stripesize StripeSize
	Gives the number of kilobytes for the granularity of the stripes. StripeSize must be 2^n (n = 2 to 9) for metadata in LVM1 format. For metadata in LVM2 format, the stripe size may be a larger power of 2 but must not exceed the physical extent size.
-l, --extents LogicalExtentsNumber
	Gives the number of logical extents to allocate for the new logical volume.
-L, --size LogicalVolumeSize[kKmMgGtT]
	Gives the size to allocate for the new logical volume. A size suffix of K for kilobytes, M for megabytes, G for gigabytes or T for terabytes is optional. Default unit is megabytes.
--minor minor
	Set the minor number.
-M, --persistent y/n
	Set to y to make the minor number specified persistent.
-n, --name LogicalVolumeName
	The name for the new logical volume. Without this option a default names of "lvol#" will be generated where # is the LVM internal number of the logical volume.
-p, --permission r/w
	Set access permissions to read only or read and write. Default is read and write.
-r, --readahead ReadAheadSectors
	Set read ahead sector count of this logical volume to a value between 2 and 120. Ignored by device-mapper.
-R --regionsize MirrorLogRegionSize
	A mirror is divided into regions of this size (in KB), and the mirror log uses this granularity to track which regions are in sync.
-s, --snapshot
	Create a snapshot logical volume (or snapshot) for an existing, so called original logical volume (or origin). Snapshots provide a ’frozen image’ of the contents of the origin while the origin can still be updated. They enable consistent backups and online recovery of removed/overwritten data/files. The snapshot does not need the same amount of storage the origin has. In a typical scenario, 15-20% might be enough. In case the snapshot runs out of storage, use lvextend(8) to grow it. Shrinking a snapshot is supported by lvreduce(8) as well. Run lvdisplay(8) on the snapshot in order to check how much data is allocated to it.
-Z, --zero y/n
	Controls zeroing of the first KB of data in the new logical volume. Default is yes. Warning: trying to mount an unzeroed logical volume can cause the system to hang.

Examples

"lvcreate -i 3 -I 8 -L 100 vg00" tries to create a striped logical volume with 3 stripes, a stripesize of 8KB and a size of 100MB in the volume group named vg00. The logical volume name will be chosen by lvcreate.