On Wed, Oct 14, 2009 at 10:20 AM, Bryn M. Reeves <bmr@xxxxxxxxxx> wrote: > 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. > > Thanks for that Bryn. I'll do just that. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
