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Re: SAN performance mystery

From: "John Vincent" <pgsql-performance(at)lusis(dot)org>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: SAN performance mystery
Date: 2006-06-19 12:59:48
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
> > I'd have to agree with you about the specific SAN/setup you're working
> > with there.  I certainly disagree that it's a general property of SAN's
> > though.  We've got a DS4300 with FC controllers and drives, hosts are
> > generally dual-controller load-balanced and it works quite decently.
> >
> How are you guys doing the load balancing? IIRC, the RDAC driver only does
> failover. Or are you using the OS level multipathing instead? While we were
> on the 4300 for our AIX boxes, we just created two big RAID5 LUNs and
> assigned one to each controller. With 2 HBAs and LVM stripping that was
> about the best we could get in terms of load balancing.
> Indeed, the EMC SANs are generally the high-priced ones too, so not
> > really sure what to tell you about the poor performance you're seeing
> > out of it.  Your IT folks and/or your EMC rep. should be able to resolve
> > that, really...
> The only exception I've heard to this is the Clarion AX150. We looked at
> one and we were warned off of it by some EMC gearheads.

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