Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs Post: 302968033

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Operating Systems AIX Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs Post 302968033 by maraixadm on Thursday 3rd of March 2016 11:08:21 AM

03-03-2016

Registered User

Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs

need to confirm:
we have a system with two VIOs each serving a partition on a local disk to a client LPAR. That client LPAR has them both in a VG which is mirrored (exact). So each disk has a copy of the client LV that the client VG supports. This is the setup that was bequeathed to us by the vendors who set up the system originally, and which we've replicated to further systems.

I'm doing an upgrade cycle on the VIOs. If I reboot one of them after installing the upgrade, I would like

the other VIO to continue serving its instance of the mirrored LV - don't see a reason to anticipate trouble with this
when the rebooted VIO comes back, I expect the client LVM to deal with incongruities between the two copies of the mirrored LV appropriately.

#2 is my concern. What I read about mirror write consistency is that active MWC records writes in the MWC log and reaps that when the VG is varied back on, while passive MWC records that an LV has been opened, and forces a syncvg.

I'm trying to dig up how that applies when I shut down one VIO and thus make one of the client PVs supporting the mirrored client LV disappear for a while, then turn it back on and have it reappear in the mirrored VG. MWC is set to on/active for the mirrored LV.

Should I not worry because this is the correct configuration and this is what it was designed to support ?

Conversely, should I save myself the concern and drive risk to 0 by shutting down the client LPAR ? We have a maintenance window to work with; on the other hand it seems to me this is the kind of scenario that VIO redundancy was meant to address, so I shouldn't have to shut down client LPARs.

TIA...

---------- Post updated 03-03-16 at 11:08 ---------- Previous update was 03-02-16 at 18:09 ----------

well, it worked fine - no bobbles in the filesys

still interested in any views you may have of the above, tx

maraixadm

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volrootmir

volrootmir(8)						      System Manager's Manual						     volrootmir(8)

NAME

       volrootmir - Mirror areas necessary for booting to a new disk

SYNOPSIS

       /usr/sbin/volrootmir [-a] [nconfig=count] target_disk [swap=target_partition]

OPTIONS

       Specifies that all volumes on the system disk be mirrored, not just the root and swap volumes, rootvol and swapvol.

DESCRIPTION

       The volrootmir script causes a mirror copy of areas of the root disk involved in booting to be made on the specified target disk.

       When  used without the -a option, volrootmir adds mirrors of the root and swap volumes and allocates them on the new disk. In addition, all
       disk regions required for booting are set up and partitions for the new volume mirrors are created.

       When used with the -a option, volrootmir mirrors all in-use partitions on the system disk.

       To mirror a swap volume that is on a separate disk from the root volume, the swap attribute must be used to specify a separate  target  for
       the swap mirror.

       The  target  disk(s)  must be at least as large as the sum of the sizes of rootvol and swapvol. Also, the physical disk should not have any
       disk partition in use.

       This script can be called from the voldiskadm menus by choosing the Mirror volumes on a disk operation.

ATTRIBUTES

       Specifies the number of log copies and copies of the configuration database, for example,  nconfig=2.   Specifies  that	the  swap  volume,
       swapvol, be mirrored on a separate disk, as specified by target_partition.

EXAMPLES

       The following command mirrors the rootvol and swapvol volumes onto the target disk, dsk3. This command will fail if swapvol is on a differ-
       ent disk from rootvol.

	      # volrootmir dsk3 The following command mirrors rootvol, swapvol, and any other volumes on the root disk onto the target disk, dsk3.
	      This command will fail if swapvol is on a different disk from rootvol.

	      #  volrootmir -a dsk3 The following command mirrors rootvol on disk dsk3, swapvol onto partition dsk7d, and any other volumes on the
	      root disk onto disk dsk3. This command will fail if swapvol is on the same disk as rootvol.

	      # volrootmir -a dsk3 swap=dsk7d The following command mirrors rootvol onto disk dsk3 and swapvol onto partition dsk7d. This  command
	      will fail if swapvol is on the same disk as rootvol.

	      # volrootmir dsk3 swap=dsk7d

SEE ALSO

       volintro(8), voldiskadm(8)

																     volrootmir(8)