when you add sym devices to a device group it will make sure that they are mapped to the same address on the FA.

what does this option do? where exactly this helps/benefits?

use -lun when you add devices to storage group.

can't think of anything else other than consistency when you run symdev show and look at device properties.

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.

Can you list out some benefits?

Thanks

Dino

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.

no problem...

Are you guys referring to LUN ID we ll get it by the below command?

symcfg -sid xxx list -dir 8G -p 0 -addr -avail

or LUN ID we see inside a masking view for each device?

Thanks

Dinesh