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Full Discussion: urgent problems with ESS SAN, SDD upgrade on AIX 5.3 server
Operating Systems AIX urgent problems with ESS SAN, SDD upgrade on AIX 5.3 server Post 302114829 by Skyybugg on Wednesday 18th of April 2007 05:49:55 PM
Old 04-18-2007
I highly recommend you get a SAN Engineer that knows what they are doing. I f you have SAN support with IBM *CALL THEM*. they are smart enough not to take you beyond what they are capable.

I believe they let you have one support call at purchase that they will let you keep open for 30 days.

If don't have support pay the T&M to IBM. Even if it costs a couple thousand it may be worth it.

This is not much, but a SAN Engineer upgraded our ESS sdd and host attachment scripts over a year ago. The pool of disks were at that time viewable by all of 4 AIX systems, but the disks weren't carved on all 4 systems. At any rate, the vpath #s did change after our upgrade. From what I understood they where expected to change. The LUN IDs are what is important. Be careful.
 

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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)
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