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-family/index.html 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