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Top Forums UNIX for Advanced & Expert Users AIX + disk redundency input needed Post 6009 by rwb1959 on Tuesday 28th of August 2001 11:38:56 AM
Old 08-28-2001
disk redundancy

Using straight mirrors (RAID 1) or using
striping w/parity (RAID 5 i assume) is really
a tradoff of sorts. Yes you will get better
use of your disks using RAID 5 however recovery
from a disk failure takes longer and in general,
write performance will be degraded during
normal operation. RAID 1 gives you the best
failure recovery and redundancy but at a much
higher cost. Also, RAID 1 does not affect write
performance very much at all. If you've got
the bucks, and as you say, data loss is not
permitted, I'd stick with RAID 1.
 

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

NAME
vgreduce - reduce a volume group SYNOPSIS
vgreduce [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi- calVolumePath...] DESCRIPTION
vgreduce allows you to remove one or more unused physical volumes from a volume group. OPTIONS
See lvm for common options. -a, --all Removes all empty physical volumes if none are given on command line. --removemissing Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes normal operation of the volume group (new logical volumes may again be created, changed and so on). If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove them manually, you can run this option with --force to have vgreduce remove any partial LVs. Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those parts that lie on disks that are still present. If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti- vating your logical volumes with --partial as described in lvm (8). SEE ALSO
lvm(8), vgextend(8) Sistina Software UK LVM TOOLS 2.02.67(2) (2010-06-04) VGREDUCE(8)
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