On Fri, Aug 19, 2005 at 03:20:52PM -0500, Dana Holland wrote: > Ed Wilts wrote: > >Are the FastT controllers active/passive or active/active? How are you > >doing your multipathing, if at all? > > They're active/active. We aren't sure what you mean by multipathing. With redundant controllers, you have 2 muliple paths to the same physical device. With active/active controllers, you see both paths at the same time and the disk is online to both. Not only do you have the 2 paths to the disk via the 2 controllers, you also have 2 paths via the dual HBAs so you have *four* paths to the same disk. Multipathing means that you've got some software that handles the redundant paths. This handles the case where one path goes down but you still need to access the data on the other path. It allows you to recover from either a failure of the HBA, switch, or controller. With RHEL 2.1, you don't have a lot of options for multipathing. My guess is you must have set up a software raid device using just the multipath option. Alternatively, some vendors have their own multipath implementations - EMC with PowerPath, HP with SecurePath, and even some HBA drivers handle certain controllers (e.g. qlogic with HP EVA). I don't know what IBM normally recommends. -- Ed Wilts, RHCE Mounds View, MN, USA mailto:ewilts@xxxxxxxxxx Member #1, Red Hat Community Ambassador Program -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
