2009/7/8 Win Htin <[email protected]>: > Hi folks, > > Thanks to Tom's help, I have Dynamic Multipathing up and running for > my boot disks. > > My next question is, how can I configure the boot disk to stay on the > controller that I specify? Currently, the Storage Array (IBM DS4700, > Active/Active controllers) starts complaining the logical drive is not
Hello, DS4K doesn't work in active / active configuration. A LUN is assigned to a given controller. If you access the LUN through the other controller, this forces a take-over of the LUN by the other controller on the DS4K side. A frequent (like in a round-robin multipathing policy) change of LUN ownership is a sure-fire way to trash your storage performance (DS4K is going to spend most of it time changing LUN ownership instead of serving data). Logical drive not on a preferred path and a switch-over to the non-preferred path after you try to switch paths seems to indicate SAN problem. To me it looks like DS4K not able to communicate with the server through the preferred path. Regards, Paweł _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
