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Homework and Emergencies Emergency UNIX and Linux Support Is this how LVM snapshots work? Post 302511372 by pludi on Wednesday 6th of April 2011 04:58:03 PM
Old 04-06-2011
Quote:
Originally Posted by pludi
The size you're setting for the snapshot is the maximum amount of data the snapshot area can hold, meaning the maximum amount of data that may change before the snapshop becomes stale.
 

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LVRESIZE(8)						      System Manager's Manual						       LVRESIZE(8)

NAME
lvresize - resize a logical volume SYNOPSIS
lvresize [--alloc AllocationPolicy] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [-i|--stripes Stripes [-I|--stripesize StripeSize]] {-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE}] | -L|--size [+]LogicalVolumeSize[kKmMgGtT]} [-t|--test] [-v|--verbose] LogicalVol- umePath [PhysicalVolumePath...] DESCRIPTION
lvresize allows you to resize a logical volume. Be careful when reducing a logical volume's size, because data in the reduced part is lost!!! You should therefore ensure that any filesystem on the volume is shrunk first so that the extents that are to be removed are not in use. Resizing snapshot logical volumes (see lvcreate(8) for information about creating snapshots) is supported as well. But to change the number of copies in a mirrored logical volume use lvconvert(8). OPTIONS
See lvm for common options. -l, --extents [+|-]LogicalExtentsNumber[%{VG|LV|PVS|FREE}] Change or set the logical volume size in units of logical extents. With the + or - sign the value is added to or subtracted from the actual size of the logical volume and without it, the value is taken as an absolute one. The number can also be expressed as a percentage of the total space in the Volume Group with the suffix %VG, relative to the existing size of the Logical Volume with the suffix %LV, as a percentage of the remaining free space of the PhysicalVolumes on the command line with the suffix %PVS, or as a percentage of the remaining free space in the Volume Group with the suffix %FREE. -L, --size [+|-]LogicalVolumeSize[kKmMgGtTpPeE] Change or set the logical volume size in units of megabytes. A size suffix of M for megabytes, G for gigabytes, T for terabytes, P for petabytes or E for exabytes is optional. With the + or - sign the value is added to or subtracted from the actual size of the logical volume and without it, the value is taken as an absolute one. -i, --stripes Stripes Gives the number of stripes to use when extending a Logical Volume. Defaults to whatever the last segment of the Logical Volume uses. Not applicable to LVs using the original metadata LVM format, which must use a single value throughout. -I, --stripesize StripeSize Gives the number of kilobytes for the granularity of the stripes. Defaults to whatever the last segment of the Logical Volume uses. Not applicable to LVs using the original metadata LVM format, which must use a single value throughout. StripeSize must be 2^n (n = 2 to 9) SEE ALSO
lvm(8), lvconvert(8), lvcreate(8), lvreduce(8), lvchange(8) Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) LVRESIZE(8)
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