[dm-devel] Clariion CX600 automatic failback support

[Brian Long]

On Wed, 2005-10-26 at 15:37 -0400, Phil Lowden (plowden) wrote:
> I'm using LVM2 with device-mapper-multipath 0.4.5 on GA RHEL 4 update 2 
> release, kernel version 2.6.9-22.ELsmp.  Storage is 4 Clariion CX600
> LUNs, 
> 2 with a primary path on SP A and 2 on SP B.  HBAs are QLA3240 with
> firmware 3.03.15 IPX and the RedHat-distributed driver version
> 8.01.00b5-rh2.
> 
> When I disrupt one path by disabling a host or SP switch port,
> failover works great but failback doesn't happen automatically
> with the current config (below).  By this I mean
> when the connection to e.g. SP B is restored, all
> 4 LUNs stay trespassed to SP A.  Is this by design?
> Or is there support for automatic failback, i.e.
> I/O is paused and a trespass is issued to restore
> the 2 SP B LUNs to their primary paths?
> 
> Of course manual failback is possible, but without
> quiescing I/O I found I was able to munge my LVM2
> objects up quite nicely.  Manual failback with quiesced 
> I/O is fine.

No one has automatic failback working on Clarrion storage?

/Brian/
-- 
       Brian Long                      |         |           |
       IT Data Center Systems          |       .|||.       .|||.
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