On Monday 24 September 2007 13:19:14 Jan-Frode Myklebust wrote: > On 2007-09-24, Nuno Fernandes <[EMAIL PROTECTED]> wrote: > > I have 4 paths to each lun. > > > > (a) HBA1 ====== DS4x00 controller A ==== LUNx > > (b) HBA1 ~~~~~~ DS4x00 controller B ~~~~ LUNx > > (c) HBA2 ====== DS4x00 controller A ==== LUNx > > (d) HBA2 ~~~~~~ DS4x00 controller B ~~~~ LUNx > > With engenio/rdac that's what you have if you're lucky, but you might > just as well be unlucky and get: > > (a) HBA1 ====== DS4x00 controller A ==== LUNx > (b) HBA1 ====== DS4x00 controller B ==== LUNx > (c) HBA2 ~~~~~~ DS4x00 controller A ~~~~ LUNx > (d) HBA2 ~~~~~~ DS4x00 controller B ~~~~ LUNx
I've disabled AVT (Automatic Volume Transfer) in DS4700. I can't have two active paths to the same LUNx using both controllers. The only storage that does active-active controller with the same LUN is HP EVA (to my knowledge). I'm not using RDAC (rdac only works on RHEL4 or kernels below 2.6.11). I'm trying to use multipath-tools compiled with rdac support (multipath-tools-0.4.8). > > Then a failure on (a) sends a failover message to controller B over (b).. > > > When i cut off paths (a) and (c) it should send though paths (b) and (d) > > commands to failover the active controler of the LUNx from controller A > > to controller B. It that moment both paths (b) and (d) would be active > > and data should be accessible. > > How do you cut of (a) and (c), without affecting (b) and (d) ? I disconnect the cables that link that specific controller (the active one) to the fibre switches (brocade). The linux machine loses both links to the active controller. > > It's the same thing as EMC Clariion Active/Passive controller. > > I'm not familiar with EMC Clariion... but have hit this exact same > problem on IBM DS4800/RDAC. How did you solve it? :) Rgds Nuno Fernandes > > > -jf > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
