Is there a way to add the "-consistent_lun" flag to an initiator group once it has been created? We did not know about this feature when we originally implemented VMAX, but now that we have configured 100+ production initiator groups, we are interested in turning this feature on for all of the currently configured groups.
I understood that enabling consistent_lun option on initiator groups will make sure it takes the same LUN address across all FA ports in that port group.
When the lun numbers are the same it makes it very clear from a host view that you are looking at the same device.
For cascaded IG's, (when creating them for clustered hosts / ESC etc.) you will get the same Lun across each SG in the child IG's. Otherwise you can get different physical hosts seeing the same devices, but with different LUNID... confusing.
We added this option in specifically for VMware environments when autoprovisioning came out. A few ESX versions back ESX required the LUN IDs to be the same across all paths in order for multipathing to work correctly. This isnt the case any more but there are some situations like RDMs and vMotion where they still need to be the same across hosts so this option is helpful in that regard. So enabling it on VMware clusters is still a best practice and like the others said makes management easier.
dynamox
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Posted August 30th, 2010 10:00
symaccess -sid 1234 -name test_IG -type initiator set consistent_lun on