[linux-lvm] SAN Storage/mirror/lvm
cott at internetstaff.com
Mon Aug 9 17:19:53 UTC 2004
>I setup a similar system on a HDS-9570 but with only one
>card in each machine - 'assuming' that the failover in the
>driver would cope if a controller on the HDS failed (as
>opposed to a QLogic failure)
>This worked fine if I disconncected a path in the fabric but
>when we took a controller of line the failover failed.
>Since then I have used md multipath which has tested fine
I have a similar issue, two storage processors, two HBAs, and
redundant paths between them.
On the host, I see 4 SCSI devices, two valid, two invalid - I'm
guessing this is caused because only one storage processor exports
a particular LUN, so half the paths are invalid until a storage
processor fails over.
sdd - SP A Path 1
sde - SP B Path 1
sdf - SP A Path 2
sdg - SP B Path 2
I have a LUN currently on SP B, so I can use md multipath configured
with /dev/sde and /dev/sdg, and that seems to work.
However, two things:
1) How do I set this up to handle a failover to SP A?
2) Multipath only seems to work in failover mode, is there a way to
load balance across the two paths?
Anyone have any hints? :)
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