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Operating Systems AIX Migrating LUNs to new storage array Post 303038873 by rbatte1 on Monday 16th of September 2019 07:57:15 AM
Old 09-16-2019
Just a thought (and trying to avoid downtime) can you not add the new LUNs into the VG and then migrate them with the server still live? I've done this very successfully and prevented needless hours of downtime (three weekends-worth)

The team I was helping to do this were very nervous and wanted the belt & braces approach so we:-
  1. Added the new LUNs to the VG
  2. Mirrored the LVs (no sync) and confirmed the layout was correct (not spread to old disks etc.)
  3. Ran a syncvg and left if. Any problems, we would drop the new leaving the old intact.
When it had completed, we:-
  1. Removed the mirror from the old/original disk
  2. Removed the original disks from the volume group
Like I say, this was done with the server online and processing. The volume manager deals with this very well, and whilst it takes a long time to synchronise, it's probably no worse than waiting for something else to migrate the data. It is also reversible up to the point you commit by removing the mirror copies on the old disks.

Why do you not want to have both SANs connected at the same time? The usual arrangement is to have the SAN connections passed through a switch rather than direct to the AIX host. Is there a reason that you could not just add the new SAN connections to these switches?



I hope this gives you an alternative,
Robin

Last edited by rbatte1; 09-16-2019 at 09:03 AM..
 

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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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