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Full Discussion: SAN storage and speed
Operating Systems AIX SAN storage and speed Post 302266067 by shockneck on Tuesday 9th of December 2008 10:20:36 AM
Old 12-09-2008
Speed is influenced mainly by the number of physical disks used and the SAN storage's RAID level. Type of VG influences speed too but as backups consists often of large archives this probably won't make a big difference.
Splitting the storage in several smaller VG could be usefull in case you need to backup/restore those VG themselves but as you said the storage is meant as sort of dump site for other backups you could neglect this aspect.
With SAN disks of 1TB size each I'd use one Standard VG with multiple LVs. If the SAN disks are on the same physical disks create your LV/FS regardless of the LV's allocation policy. If the disks come from different SAN-VG/Ranks/whatever (i.e. different phys. disks), create the LV with an inter policy of maximum. (Always try to use all physical disks, avoid creating hotspots.)
 

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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 2.02.95(2) (2012-03-06) VGREDUCE(8)
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