 | | | RHEL + SAN feedback | RHEL + SAN feedback 2005-06-27 - By Tom Sightler
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On Mon, 2005-06-27 at 13:10 -0700, Tobias Speckbacher wrote:
> On Mon, 2005-06-27 at 15:03 -0500, Benji Spencer wrote:
> > Are you hoping to have failover paths to each disk? We have the EMC CX500
> > with RHEL3, though we aren't running 10g as the db (we are playing with
> > 9iR2 in a RAC configuration though). If you want failover for the paths,
> > you will need (to pay for) EMC's PowerPath.
>
> As i understand the QLogic driver supports failover (is that an option
> with EMC ? or do people default to powerpath). I would get PowerPath to
> accomplish loadbalancing though.
The Qlogic failover is not support with EMC Clariion.
You can actually make it work, but there are failure scenarios that it
won't cover because of the way that the EMC failover works. EMC only
supportes PowerPath for RHEL3 at this time.
For RHEL4 there doesn't yet appear to be an official multipath solution
from either Redhat or EMC yet. RHEL4 with U1 does include the new dm-
emc module which provides native support for EMC Clariion failover but I
don't yet see any documentation and it seems that multipathd is required
for proper support and this doesn't appear to be yet included with
RHEL4.
I've kludged it together on a box and played with it on one of our CX400
arrays and it seems to work, but if there was a problem I doubt Redhat,
EMC, or Oracle would touch it.
For and EMC Clariion the current best solution (and only supported one)
appears to be RHEL3 with PowerPath. Even then there are a lot of
caveats. Be sure to stay only on kernel versions supported by EMC, and
if you do have a problem expect Redhat to make you reproduce without
PowerPath loaded. It's really a total pain.
Fortunately, it mostly just works. We've been running Oracle on RHEL
with PowerPath, starting with RHEL 2.1, and for the last 18 months or so
on RHEL 3, and it's mostly just hummed along, but we have hit an issue
here or there, especially we we got trigger happy with kernel updates
and jumped the certifications.
Later,
Tom
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