|
>>>Andrew Miehs <andrew@2sheds.de> 02/01/06 8:52 am >>> Hi Doug, Thanks for the quick answer - Setup is as follows * 1 port on Server HBA connected to a switch * port 1 from controller A on D240 connected to switch * port 1 from controller B on D240 connected to switch * LUN1 (disk) default active over controllerA * LUN2 (disk) default active over controllerB What confuses me is NOT that fact that I see both disks twice, (so four devices in total) sdc, sdc, sdd, sde BUT that I can only access two of these - via the 'active' controller on the storage system. If I access the 'second path' via the 'other' controller to a disk, I get io errors... Is this normal? I was expecting that all controllers offer all disks equally, and am a bit confused about this 'default active' setting... I has hoping to avoid compiling the RDAC driver from engenio as it is 'configured' for RedHat or Suse, and I now have to go through the Makefile to fix it - hopefully this should be pretty easy... Their RDAC driver seems to use 'MPP' for the failover - whatever this is.... I guess I will work that out in the next couple of hours! Thanks for any suggestions, Andrew On Feb 1, 2006, at 2:39 PM, Doug Griswold wrote: >You will see at least 2 devices for every one drive depending on >your san configuration. Multipath tools or mdadm can combine these >to make one multipath device. The qlogic driver will do this for >you as well. From what I have seen if you want support from the >storage company you should connect the way they specify in their docs. > -- To UNSUBSCRIBE, email to debian-isp-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
I'm not a san expert but Ibelieve that there are different types of SAN Architectures. I am familiar with active/active which means it works like you are thinking I believe there is an active/passive or something similiar which means the other lun is only available when the other path fails from the switch. I would verify this info on active/passive
|