Jo! A very happy me shouts out thanks to all the list. Special thanks to Lars who gave the final hint: On Sun, 24.07.2005-22:02:38 +0200, Lars Marowsky-Bree wrote: > On 2005-07-22T14:09:55, Philipp Niemann <niemann@xxxxxxxx> wrote: > > [snip] > > hardware_handler "1 emc" > > } > > For the Clariion 4500, you need to set the hardware_handler to > "3 emc 1 0" > > (The trespass command to transfer ownership of a LU from one > Service-Processor to the other is different from the FC4500 to the EMC > CX series. I've got to admit I've not tested the FC4500 yet, though.) > > You also want the pp_emc callout from the newer multipath-tools > package and use that as the priority callout, and group by priority. Actually I am using 'hardware_handler "3 emc 1 1"' in my config file now. Without the reservation bit honouring the failover didn't work. I also upgraded to multipath-tools-0.4.4 to get the pp_emc thingy. That gives me a configuration where I can trespass LUNs on the Array via the Management Suite and get them switched back by my linux box. The other way works too, so that a write operation on a SAN Filesystem continues to write even if I pull out the active cable. When I plug it back in place after some time, the system even switches back to the default path. Wow! Only scratch in the surface is that the devices come back in with new names, so former sde becomes sdo. Maybe persistent bindings might help. I got somewhat scared as the system issues _lots_ of IO Errors. But a filesystem check after IO Operation finished gave no problems whatsoever. So I guess it worked alright. Thanks again for your support, Philipp -- Philipp Niemann DIMDI Abteilung D / AG D4 Peripherie / UNIX-Systembetreuer Waisenhausgasse 36-38a Tel. : 0221/4724-281 50676 Koeln
