Mirrorvg to different multiple disks Post: 302883864

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Operating Systems AIX Mirrorvg to different multiple disks Post 302883864 by bakunin on Thursday 16th of January 2014 11:54:03 AM

01-16-2014

Registered User

Quote:

Originally Posted by ibmtech

Answer to 2nd post
To the best of my knowledge HACMP is active/passive, never worked on PowerMirror7.1, and not sure if it has active/active feature.

HACMP (all versions, regardless of their name) have "rotating" and "cascading" resource groups.

"rotating" is active/passive: NodeA has RgA, NodeB is passive, you can switch this state, but the other node will be passive in this case.

"cascading" is active/active: NodeA has RgA, NodeB has RgB, if NodeB fails, nothing happens, if NodeA fails then NodeB will take over RgA and either shut down RgB or not.

The latter setup is for instance used in SAP setups, where you run production on one system and Test/Development on the other. Prod is HA, Test/Dev is not. Of course all this is possible with more than two nodes too, adding more complexity.

I hope this helps.

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LEARN ABOUT DEBIAN

vgreduce

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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