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Operating Systems Linux Red Hat How to Migrate from Single Disk to Many? (RHEL 4.6) Post 302363463 by home4ktt on Tuesday 20th of October 2009 10:41:14 AM
Old 10-20-2009
The manual is a good reference and something that I have already looked at, thank you.

The question that it does not answer is 'what is the best configuration of disks for performance'; should "/" have it's own disk? Or "/var". How many disks should I put into a logical volume to get the best performance payoff per disk? I am not really limited by resources here so I am looking at the best performance regardless of the number of disks involved.

Getting the logical volumes configured should not be a problem but my next question is 'how do I migrate the data from the old disk to the new'? I didn't spot that in the manual ... perhaps I missed it?

Thanks.
 

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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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