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AIX
chvg -g on Concurrent VG
Post 302259860 by funksen on Wednesday 19th of November 2008 05:24:46 AM
11-19-2008
you are right, I asked about concurrent vg, just wanted to say that it's no problem on non concurrent vgs 
we were told that we should use 60gb luns and a lot of them, due to better performance on our old DS4800 storage
on our new DS8300 we tested the same lv striped on 2, 4, 8, and only one disk
there was almost no performance improvement with more luns, thats why I ordered luns up to 260gb for some systems, makes it much easier
and back to hacmp, I know that it is possible to run hacmp with non-concurrent vgs, and in case of takeover, the vg is varied offline on primary node and online on sec node,
takes a bit longer, but it's easier to handle the whole lvm management
any experience on this?
Quote:
yes, that happens usually when the hdisk slices from the SAN are too small. I remember a datacenter where the SAN guys allocated the SAN disks in 8GB chunks because "with smaller disks we are more flexible".... I.e. know your workload from the beginning. If your data doubles every 6 month or so start with few big disks/lun so that you neither hit the VG limits nor end up with hundreds of disks/luns (that might double when mirrored).
we were told that we should use 60gb luns and a lot of them, due to better performance on our old DS4800 storage
on our new DS8300 we tested the same lv striped on 2, 4, 8, and only one disk
there was almost no performance improvement with more luns, thats why I ordered luns up to 260gb for some systems, makes it much easier
and back to hacmp, I know that it is possible to run hacmp with non-concurrent vgs, and in case of takeover, the vg is varied offline on primary node and online on sec node,
takes a bit longer, but it's easier to handle the whole lvm management
any experience on this?
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LEARN ABOUT CENTOS
vgdisplay
VGDISPLAY(8) System Manager's Manual VGDISPLAY(8) NAME
vgdisplay - display attributes of volume groups SYNOPSIS
vgdisplay [-A|--activevolumegroups] [-c|--colon] [-s|--short] [-v|--verbose] [-d|--debug] [-h|--help] [--ignorelockingfailure] [--ignoreskippedcluster] [--nosuffix] [-P|--partial] [--units hHbBsSkKmMgGtTpPeE] [--version] [VolumeGroupName [VolumeGroupName...]] vgdisplay --columns|-C [--aligned] [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--ignoreskippedcluster] [--noheadings] [--nosuf- fix] [-o|--options [+]Field1[,Field2...]] [-O|--sort [+|-]Key1[,[+|-]Key2...]] [-P|--partial] [--separator Separator] [--unbuffered] [--units hHbBsSkKmMgGtTpPeE] [-v|--verbose] [--version] [VolumeGroupName [VolumeGroupName...]] DESCRIPTION
vgdisplay allows you to see the attributes of VolumeGroupName (or all volume groups if none is given) with it's physical and logical vol- umes and their sizes etc. vgs(8) is an alternative that provides the same information in the style of ps(1). OPTIONS
See lvm(8) for common options and vgs(8) for options given with --columns. -A, --activevolumegroups Only select the active volume groups. The volume group is considered active if at least one of its logical volumes is active. -c, --colon Generate colon separated output for easier parsing in scripts or programs. N.B. vgs(8) provides considerably more control over the output. The values are: 1 volume group name 2 volume group access 3 volume group status 4 internal volume group number 5 maximum number of logical volumes 6 current number of logical volumes 7 open count of all logical volumes in this volume group 8 maximum logical volume size 9 maximum number of physical volumes 10 current number of physical volumes 11 actual number of physical volumes 12 size of volume group in kilobytes 13 physical extent size 14 total number of physical extents for this volume group 15 allocated number of physical extents for this volume group 16 free number of physical extents for this volume group 17 uuid of volume group -s, --short Give a short listing showing the existence of volume groups. -v, --verbose Display verbose information containing long listings of physical and logical volumes. If given twice, also display verbose runtime information of vgdisplay's activities. --version Display version and exit successfully. --columns|-C Display output in columns, the equivalent of vgs(8). Options listed are the same as options given in vgs(8). SEE ALSO
lvm(8), vgs(8), pvcreate(8), vgcreate(8), lvcreate(8) Sistina Software UK LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26) VGDISPLAY(8)