PS: Is my problem hard loop ID's or LUN's? Could I achieve what I need either way or is it one or thew other? On Tue, 26 Sep 2006 07:44:00 -0400, Kovacs, Corey J. wrote: > One more thing, when using more than one path (basically anyu san setup) the > > device > mappings will wrap around for every path, so for two paths... single hba, > dual controller.. > > > three disks will look like this... > > disk1=/dev/sda > disk2=/dev/sdb > disk3=/dev/sdc > disk1=/dev/sdd > disk2=/dev/sde > disk3=/dev/sde > > and four like this.. > > disk1=/dev/sda > disk2=/dev/sdb > disk3=/dev/sdc > disk4=/dev/sdd > disk1=/dev/sde > disk2=/dev/sde > disk3=/dev/sdf > disk4=/dev/sdg > > > Or for dual hba, dual controller (4 paths) > > > disk1=/dev/sda > disk2=/dev/sdb > disk3=/dev/sdc > disk4=/dev/sdd > disk1=/dev/sde > disk2=/dev/sde > disk3=/dev/sdf > disk4=/dev/sdg > disk1=/dev/sdh > disk2=/dev/sdi > disk3=/dev/sdj > disk4=/dev/sdk > disk1=/dev/sdl > disk2=/dev/sdm > disk3=/dev/sdn > disk4=/dev/sdo > > etc... > > Cheers > > With the Qlogic drivers in failover mode, you'll get this.. > > disk1=/dev/sda > disk2=/dev/sdb > disk3=/dev/sdc > disk4=/dev/sdd > > even though there are multiple paths > > > Corey > > -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Kovacs, Corey J. > Sent: Tuesday, September 26, 2006 7:38 AM > To: isplist@xxxxxxxxxxxx; linux clustering > Subject: RE: General FC Question > > You don't say which FC cards you are using but if it's qlogic, then the > driver can be set to combine the devices. Basically whats happened is that > your machine is picking up the alternate path to the device, which is a > perfectly valid thing to do, it's just not what you need at this point. It > may be as simple as your > > secondary controller actually has the lun you are trying to access. To work > around yo might just be able to reset the seconday controller and force the > primary to take over the LUN. This happens quite a bit depending on your > setup. The Qlogic drivers, when setup for failover, will coelesce the > devices > into a single device by the WWID of the LUN. If that's not an option, then > try the multipath tools support in > RHEL4.2 > or above. You won't be using the /dev/sd{a,b,c,...} devices, rather it'll be > /dev/mpath/mpath0 etc, or whatever you set them to instead. > > Even without failover, the latest Qlogic drivers will make both paths active > so that you never end up with a dead path upon boot up. > > > Hope this helps. > > > Corey > > -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of isplist@xxxxxxxxxxxx > Sent: Monday, September 25, 2006 11:18 AM > To: linux-cluster > Subject: General FC Question > > After adding storage, my cluster comes up with different /dev/sda, /dev/sdb, > etc settings. My initial device now comes up as sdc when it used to be sda. > > Is there some way of allowing GFS to see the storage in some way that it can > know which device is which when I add a new one or remove one, etc? > > Hard loop ID's on the FC side I think but is there anything on the GFS side? > > Mike > > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
