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Full Discussion: Cluster 6.1 storage move
Operating Systems AIX Cluster 6.1 storage move Post 302949019 by bakunin on Monday 6th of July 2015 05:38:34 AM
Old 07-06-2015
Quote:
Originally Posted by snchaudhari2
The plan that our architect implemented in summary is :
shutdown the source servers,
replicate the old luns with new luns,
remove the old luns and allocate new luns.
Bring the servers up.
The problem with this plan is:

1. the new LUNs will have different WWNs and therefore the volume group information of the system will not be consistent. Basically you will have to build the cluster resources anew.

2. You need a (complete) downtime to do this as your storage guy planned. What i described will need no downtime at all. To reconfigure all the VGs and RGs plan at least 1-2 hours (30 min to actually do it, 30-90 min in contingency) and you will not know if everything went well until you do an "extended verification and synchronisation". (Technically speaking, you will be creating new VGs, which just happen to have the same name as the old ones and you will build new ressource groups from them, which happen to have the same name as the old ones.)

I hope this helps.

bakunin
 

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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)
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