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lvm
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Using the AIX splitvg command.
Just the other day, I needed to use the AIX splitvg command in order to copy some data from one system to another. I thought I’d share the experience here. The splitvg command can split a single mirror copy of a fully mirrored volume group into a separate “snapshot” volume group. From the man page: The original volume group VGname will stop using the disks that are now part of the snapshot volume group SnapVGname. Both volume groups will keep track of the writes within the volume group so that when the snapshot volume group is rejoined with the... [More]
Tags: aix lvm |
Working with AIX scalable volume groups.
Scalable volume groups first appeared in AIX 5.3. They allow
a maximum of 1024 physical volumes and 4096 logical volumes per volume group.
This is pretty cool for large systems. In the ‘old days’ we could end up in
situations where we’d reached the maximum PV count (32 or 128) for a VG and
have to create a new VG to work around the issue. I use scalable VGs for all my new large AIX system builds. The following command will create a scalable VG (named svg ) on hdisk4. You’ll notice that MAX
PVs is set to 1024 and MAX LVs is set to 256.... [More]
Tags: gibson aix vg manager lvm pv chris chvg hdisk max physical lv scalable groups group mkvg logical volume |
Working with AIX scalable volume groups - Part 2 - converting to scalable.
Following on
from my previous post, on working with scalable VGs. https://www.ibm.com/developerworks/mydeveloperworks/blogs/cgaix/entry/working_with_aix_scalable_volume_groups1?lang=en You may find
yourself in a situation where you’d like to convert a VG to scalable. For example,
you might start off with a normal VG i.e. one that can support a maximum of 256
LVs and 32 PVs. # mkvg -s
512M -y myvg hdisk5 myvg # lsvg myvg VOLUME
GROUP: myvg VG IDENTIFIER: 00f6027300004c0000000133aa24d1f6 VG
STATE:... [More]
Tags: aix lvm chvg pv gibson convert -g mkvg manager hdisk scalable chris conversion group groups volume max vg physical lv logical |
