Migrating LUNs to new storage array Post: 303038873

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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

09-16-2019

Moderator

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:-

Added the new LUNs to the VG
Mirrored the LVs (no sync) and confirmed the layout was correct (not spread to old disks etc.)
Ran a syncvg and left if. Any problems, we would drop the new leaving the old intact.

When it had completed, we:-

Removed the mirror from the old/original disk
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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LEARN ABOUT CENTOS

scsi-rescan

RESCAN-SCSI-BUS.SH(1)						   User Commands					     RESCAN-SCSI-BUS.SH(1)

NAME

       rescan-scsi-bus.sh - script for adding and removing SCSI devices without rebooting

SYNOPSIS

       rescan-scsi-bus.sh [options] [host [host ...]]

OPTIONS

       -a, --alltargets
	      scan all targets, not just currently existing [default: disabled]

       -d     enable debug			 [default: 0]

       -l     activates scanning for LUNs 0--7	 [default: 0]

       -L NUM activates scanning for LUNs 0--NUM [default: 0]

       -w, --wide
	      scan for target device IDs 0--15	 [default: 0--7]

       -c     enables scanning of channels 0 1	 [default: 0 / all detected ones]

       -r, --remove
	      enables removing of devices	 [default: disabled]

       -f, --flush
	      flush failed multipath devices	 [default: disabled]

       -i, --issue-lip
	      issue a FibreChannel LIP reset	 [default: disabled]

       -u, --update
	      look for existing disks that have been remapped

       -s, --resize
	      look for resized disks and reload associated multipath devices, if applicable

       --forcerescan
	      rescan existing devices

       --forceremove
	      remove and readd every device (DANGEROUS)

       --nooptscan
	      don't stop looking for LUNs is 0 is not found

       --color
	      use coloured prefixes OLD/NEW/DEL

       --hosts=LIST
	      scan only host(s) in LIST

       --channels=LIST
	      scan only channel(s) in LIST

       --ids=LIST
	      scan only target ID(s) in LIST

       --luns=LIST
	      scan only lun(s) in LIST

       --sync, --nosync
	      issue a sync / no sync [default: sync if remove]

       --attachpq3
	      tell kernel to attach sg to LUN 0 that reports PQ=3

       --reportlun2
	      tell kernel to try REPORT_LUN even on SCSI2 devices

       --largelun
	      tell kernel to support LUNs > 7 even on SCSI2 devs

       --sparselun
	      tell kernel to support sparse LUN numbering

	      Host numbers may thus be specified either directly on cmd line (deprecated) or or with the --hosts=LIST parameter (recommended).

       LIST: A[-B][,C[-D]]... is a comma separated list of single values and ranges (No spaces allowed.)

SEE ALSO

       rescan-scsi-bus.sh Homepage: http://www.garloff.de/kurt/linux/#rescan-scsi

       sg3_utils Homepage: http://sg.danny.cz/sg

rescan-scsi-bus.sh 1.57 					    leden 2014						     RESCAN-SCSI-BUS.SH(1)