>>>Andrew Miehs <firstname.lastname@example.org> 02/01/06 8:52 am >>>
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
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
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,
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.
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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