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Operating Systems AIX Inherited VIO server an LPARs Post 302493274 by rbatte1 on Wednesday 2nd of February 2011 09:31:44 AM
Old 02-02-2011
Inherited VIO server an LPARs

Lucky me, someone has installed a server and got it running with the best intentions, but leaving me a headache. Smilie

We have a simple p520 with 4 disks. 2x145Gb & 2x300Gb. The smaller disk pair have been built into a VIO mirrored rootvg, and quite right too.

The other two disks form a volume group each (VIO storage pools). The plan was to ensure that disk allocated to the LPARs would be made in pairs, one from each user-volume group so that we would be confident at the LPAR that the hdisk definitions presented would be from different real media. The problem I now have is that we are adding more real disk (another 16x300Gb in a separate CEC) and add more LPARs.

So, should I create more volume groups on the VIO server (storage pools) on a one-disk-one-pool rule, or should I approach this another way. What would be nice would be a way to present the LPAR with a single device made from a mirror at the VIO server and enforcing strictness on the VIO server to make sure that the mirrors are on different real disks.

I feel that if/when we have a disk failure, I'm going to have a huge mess of failed hdisks in the various LPARs we will have and a huge overhead in logging and maintaining disk separation for all these LPAR hdisks and mirrors making sure that LPAR mirrors do not inadvertently end up on the same real disk as the primary copy, albeit a different hdisk that the LPAR sees.

Big question/headache I know. Any suggestions? Smilie



Robin
Liverpool/Blackburn
UK
 

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vxpfto(1M)																vxpfto(1M)

NAME
vxpfto - set Powerfail Timeout (pfto) SYNOPSIS
vxpfto -g diskgroup -t timeout vxpfto [-g diskgroup] -t timeout volume_list vxpfto [-g diskgroup] -o pftostate={enabled|disabled} vxpfto [-g diskgroup] -o pftostate={enabled|disabled} volume_list DESCRIPTION
Powerfail Timeout is an attribute of a SCSI disk connected to an HP-UX host (see the pfto(7) man page). The vxpfto command sets the Power- fail Timeout interval on a set of Volume Manager disks, either all disks in a disk group, or all disks underlying the volumes listed. The first form of the command sets the same PFTO value for all the disks in the specified VxVM diskgroup. In the second form, all disks underlying the given list of volumes are selected, optionally restricted by the disk group specified with the -g option. If you specify a diskgroup, any volume in the list not belonging to the diskgroup is ignored. Use the -o pftostate option to disable or enable PFTO. By default, PFTO is enabled. You can enable PFTO either on all disks in a disk group, or on all disks underlying the volumes listed. If you invoke vxpfto without arguments, it displays a usage message. OPTIONS
-g diskgroup Specifies the disk group for the operation, either by disk group ID or by disk group name. -o pftostate={enabled|disabled} Enables or disables the use of PFTO for IO. -t timeout Specifies the PFTO value in seconds. The value must be zero or a positive integer. Zero represents the system default PFTO value. The default value depends on the disk driver controlling the disk device. volume_list A list of VxVM volume names. List items must be separated by white-space. EXIT CODES
vxpfto returns a zero if successful. If it encounters an error, vxpfto exits and displays a message on standard error. Defined exit codes are: 0 Success. 1 No PFTO value specified. 2 No diskgroup or volume list specified. 3 Illegal PFTO value specified. EXAMPLES
Set the PFTO value on all disks in disk group testdg to 100 seconds: vxpfto -t 100 -g testdg Set the PFTO value to 50 seconds on all disks underlying volume01 and volume02 in disk group testdg: vxpfto -t 50 -g testdg volume01 volume02 Set the PFTO value to 300 seconds on all disks underlying volume01 and volume02, even though they are not in the same disk group: vxpfto -t 300 volume01 volume02 Disable PFTO on all disks in disk group testdg: vxpfto -g testdg -o pftostate=disabled Enable PFTO on all disks underlying volume01 and volume02i in disk group testdg: vxpfto -g testdg -o pftostate=enabled volume01 volume02 SEE ALSO
vxdisk(1M), pfto(7) VxVM 5.0.31.1 24 Mar 2008 vxpfto(1M)
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