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Top Forums UNIX for Advanced & Expert Users Is there a tutorial on how to create RAID 1 on top of lvm? Post 302123256 by porter on Sunday 24th of June 2007 10:27:33 PM
Old 06-24-2007
That's the wrong way round to build RAID.

The idea behind RAID is that it can survive disk failure. If you have a disk failure LVM may be trashed first so it can't find the segments that make up the parts of the volume. If RAID is directly on a disk and a few tracks get trashed, RAID can still step over those and recover data either side.
 

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

NAME
pvresize - resize a disk or partition in use by LVM2 SYNOPSIS
pvresize [-d|--debug] [-h|--help] [-t|--test] [-v|--verbose] [--setphysicalvolumesizesize] PhysicalVolume [PhysicalVolume...] DESCRIPTION
pvresize resizes PhysicalVolume which may already be in a volume group and have active logical volumes allocated on it. OPTIONS
See lvm(8) for common options. --setphysicalvolumesize size Overrides the automatically-detected size of the PV. Use with care, or prior to reducing the physical size of the device. EXAMPLES
Expand the PV on /dev/sda1 after enlarging the partition with fdisk: pvresize /dev/sda1 Shrink the PV on /dev/sda1 prior to shrinking the partition with fdisk (ensure that the PV size is appropriate for your intended new parti- tion size): pvresize --setphysicalvolumesize 40G /dev/sda1 RESTRICTIONS
pvresize will refuse to shrink PhysicalVolume if it has allocated extents after where its new end would be. In the future, it should relo- cate these elsewhere in the volume group if there is sufficient free space, like pvmove does. pvresize won't currently work correctly on LVM1 volumes or PVs with extra metadata areas. SEE ALSO
lvm(8), pvmove(8), lvresize(8), fdisk(8) Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) PVRESIZE(8)
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