Paras pradhan wrote:
Can anybody tell me if my multipath o/p is fine?
Hitachi support should be able to
I have a active/active setup and when I unplug the FC SAN cable on one of the ports of my HBA my host is being un responsive and need to reboot it.
Sounds like it is mis configured, doing some searches I found several references to the "/sbin/pp_hds_modular" command, which you may need, in this situation it's best to deal with your vendor support they should have instructions for supported MPIO configurations(whether or not linux device mapper is supported I don't know).
Also double/triple check that your array is truely active-active, from what I recall you had a really old HDS system, I don't recall many of them being active-active(in the sense that you can access the same volume over multiple controllers simultaneously vs having different volumes exported over different controllers).
For modular active-active I was in a presentation last year by HDS for their new AMS2k line up and they claimed that was the first modular active-active array(at least from them), others have had modular active-active for a few years now, they tried to claim they were the first despite that not being true.
http://www.hds.com/products/storage-systems/adaptable-modular-storage-2000-f...
For me if I yank a cable within a couple seconds the system recovers, my vendor provides extremely specific step-by-step instructions for configuring, including modifications to the multipath init script for proper operation(7 pages in a PDF just for MPIO configuration and examples).
nate