Power HA 7 repository disk unmirrored?


 
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Operating Systems AIX Power HA 7 repository disk unmirrored?
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Old 09-27-2011
Power HA 7 repository disk unmirrored?

hi guys,

I don't like the new concept of the power ha 7 cluster with the repository disk and the internal solidb, I really would like to mirror this disk, but the "IBM PowerHA SystemMirror 7.1 for AIX" redbook says, normal lvm operations should not be performed on this disk.
even mirroring the vg wont use much, because the hdisk device is configured directly to power ha, and not the vg.

well the cluster will run without the repository, and a new one can be specified, but with a downtime I guess, but that's not what I want for my clusters. no changes to the cluster can be made without it, even such as start/stop I guess.

everything is mirrored, a downtime of a whole storage side was no problem till now.
any thoughts on this? has anyone experienced the behaviour of a cluster in this situation?
of course I will test this on my own too, but I have no test system yet

cheers funksen
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LVCONVERT(8)						      System Manager's Manual						      LVCONVERT(8)

NAME
lvconvert - convert a logical volume from linear to mirror or snapshot SYNOPSIS
lvconvert -m|--mirrors Mirrors [--mirrorlog {disk|core}] [--corelog] [-R|--regionsize MirrorLogRegionSize] [-A|--alloc AllocationPolicy] [-b|--background] [-i|--interval Seconds] [-h|-?|--help] [-v|--verbose] [--version] LogicalVolume[Path] [PhysicalVolume[Path]...] lvconvert -s|--snapshot [-c|--chunksize ChunkSize] [-h|-?|--help] [-v|--verbose] [-Z|--zero y|n] [--version] OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path] DESCRIPTION
lvconvert will change a linear logical volume to a mirror logical volume or to a snapshot of linear volume and vice versa. It is also used to add and remove disk logs from mirror devices. OPTIONS
See lvm for common options. Exactly one of --mirrors or --snapshot arguments required. -m, --mirrors Mirrors Specifies the degree of the mirror you wish to create. For example, "-m 1" would convert the original logical volume to a mirror volume with 2-sides; that is, a linear volume plus one copy. --mirrorlog {disk|core} Specifies the type of log to use. The default is disk, which is persistent and requires a small amount of storage space, usually on a separate device from the data being mirrored. Core may be useful for short-lived mirrors: It means the mirror is regenerated by copying the data from the first device again every time the device is activated - perhaps, for example, after every reboot. --corelog The optional argument "--corelog" is the same as specifying "--mirrorlog core". -R, --regionsize MirrorLogRegionSize A mirror is divided into regions of this size (in MB), and the mirror log uses this granularity to track which regions are in sync. -b, --background Run the daemon in the background. -i, --interval Seconds Report progress as a percentage at regular intervals. -s, --snapshot Create a snapshot from existing logical volume using another existing logical volume as its origin. -c, --chunksize ChunkSize Power of 2 chunk size for the snapshot logical volume between 4k and 512k. -Z, --zero y|n Controls zeroing of the first KB of data in the snapshot. If the volume is read-only the snapshot will not be zeroed. Examples "lvconvert -m1 vg00/lvol1" converts the linear logical volume "vg00/lvol1" to a two-way mirror logical volume. "lvconvert --mirrorlog core vg00/lvol1" converts a mirror with a disk log to a mirror with an in-memory log. "lvconvert --mirrorlog disk vg00/lvol1" converts a mirror with an in-memory log to a mirror with a disk log. "lvconvert -m0 vg00/lvol1" converts a mirror logical volume to a linear logical volume. "lvconvert -s vg00/lvol1 vg00/lvol2" converts logical volume "vg00/lvol2" to snapshot of original volume "vg00/lvol1" SEE ALSO
lvm(8), vgcreate(8), lvremove(8), lvrename(8), lvextend(8), lvreduce(8), lvdisplay(8), lvscan(8) Red Hat, Inc LVM TOOLS 2.02.44-cvs (02-17-09) LVCONVERT(8)