On Tue, 2009-10-13 at 22:12 +0100, Dan Track wrote: > On Tue, Oct 13, 2009 at 5:22 PM, Dan Track <dan.track@xxxxxxxxx> wrote: > > Hi, > > > > I've got two SAS links to my San, I want to test failure/recovery by > > eleminating and device node. The easiest way is to manually unplug a > > controller link and see what happens. I'd like to know how I can do it > > via Linux, and then re-enable the device node? I have two device nodes > > /dev/sda and /dev/sdb. > > > > Thanks > > Dan > > > > Hi > > Does anyone have any thoughts on this. > > Thanks > Dan > If you're using device-mapper to combine the two paths into a single multipath device you should see a change in the output of the multipath -l/-ll commands when you unplug the cable (and if the unplugged path was the path that was previously carrying I/O there'll also be a change of path groups and I/O should begin flowing over the second path). As long as you have multipathd running the failed path should be re-added to the multipath map when it returns and depending on the failback settings in use will trigger another path group switch. Regards, Bryn. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
