12-28-2018
Hi dkmartin,
From the way you describe the layout, I'm going to assume that you're running something like SVC for the management of the LUN's. Are the AIX environment LPAR's or are they standalone machines, or something else of course.
Managing LUN's accross six individual SAN devices is very costly in resource, along with the planning headache when it comes to new system builds - well inless you have plenty of disk. I currently have two devices - a 1.5Pb VMax and a 250Gb VNX and that provides enough confusion.
Where ver possible our approach is to go for a single LUN, but we do have quite a number of systems with large numbers of luns (some are in excess of 200) on AIX, Solaris and RHEL. We do have some very old versions on VMware, but they are slowly being decommissioned.
So in reality I would if time permits look at load and I/O on a system by system basis, where the results indicate there would be a benefit - replicate the existing model. If the results show it would be OK, go for the single LUN, if you're using Metro or Global mirror you may have to delve a bit deeper and look at inter system bandwidth.
Regards
Gull04
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LEARN ABOUT DEBIAN
ql-dynamic-tgt-lun-disc
ql-dynamic-tgt-disc(8) System Administration ql-dynamic-tgt-disc(8)
NAME
ql-dynamic-tgt-lun-disc - Scans for newly added LUNs.
SYNOPSIS
ql-dynamic-tgt-lun-disc [OPTIONS]
DESCRIPTION
Dynamic TGT-LUN Discovery Utility
This utility scans for newly added LUNs. After adding new LUNs, you do not need to unload, then load the QLogic FC driver or reboot the
system
To begin scanning the LUNs issue following command:
# /usr/sbin/ql-dynamic-tgt-lun-disc
-al, --allow-lip
LIP is not issued by default, even if it is required for scanning new LUNs Setting this option, allows the utility to issue LIP.
-cl, --current-luns
Displays LUNS currently present
-e, --extended-scan
Use this option as "-e | --extended-scan". to rescan LUNs. This will identify any change in attributes of existing LUNs. This option
can be used in combination of scan/refresh or max luns
-h, --help, ?
Prints this help message
-i, --interactive
Use this option to use the menu driven program
-is, --iscsi
Use this option to operate on ISCSI HBAs, this option can be used in combination of any other supported option.
-m, --max-lun
To set the maximum LUNs to be scanned
-p, --proc
Use PROC file system for LUN scanning
-r, --refresh
To refresh, that is remove LUNs that are lost use the options "-r|--refresh". This will remove the LUNs which no more exist.
-s, --scan [ -r|--refresh ]
The QLogic LUN scan utility re-scans all the devices connected to the QLogic HBA
SEE ALSO
ql-lun-state-online(8), ql-hba-snapshot(8), ql-set-cmd-timeout(8)
Matthias Schmitz <matthias@sigxcpu.org> July 2009 ql-dynamic-tgt-disc(8)