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Operating Systems AIX Inherited VIO server an LPARs Post 302498186 by ross.mather on Sunday 20th of February 2011 07:39:09 AM
Old 02-20-2011
One or two VIO is largely a matter of what the Availability requirements of the server are. In general a Production environment should have dual VIO servers. In this config howeer I expect that the issue will be around the use of the Disk Adapters.

Each disk adapter can belong to exactly one LPAR (incl a VIO), so the existing arrangement probably only has one disk adapter - hence one VIO.

If you are buying a new CEC (or is it an I/O drawer? ) you will add at least one more Disk Adapter so you could go to twin VIO. That said its still recommended to mirror the rootvg even in that environment so now 4 disks would be taken up with VIO operating systems.

Even so you'd still be left with the headache of multiple LVs being allocated to each LPAR from each VIO server and the inevitable number of resyncs you'd need after a failure or reboot of a VIO.

The best solution in these kind of environments is to use a Fibre Channel SAN storage array that can then have LUNs connected to each LPAR via one or both VIO servers (depending how you implement it). In that way its the additional pathing that is redundant not the additional disk copy.

If you are going to stick with one VIO and all those new disks - try and get a RAID card so you can create a single RAID array with all the disks, that at least would ease the management of it as the RAID array will take care of keeping the 2 copies of data on separate disks. That said - the I/O performance of this environment will be very poor.

Quote:
I'm afraid there has been no training
This is criminal, drop me a PM and I may be able to point you in the right direction in the UK to close that skills gap.

cheers
Ross
 

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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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