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SubjectRe: [patch] multipath RAID personality, 2.4.10-pre9
On Tue, Sep 18, 2001 at 08:39:46PM +0100, Adrian Bridgett wrote:
> On Mon, Sep 17, 2001 at 01:16:56 +0200 (+0000), Ingo Molnar wrote:
> [snip]
> > > [...] Also, it is my understanding that with some multipath hardware,
> > > if you read from the "backup" path it will kill access to the primary
> > > path (this can be used when more than one system access shared disk
> > > for failover). As a result, we should always read from the "primary"
> > > path for each disk unless there is an error.
> >
> > yes, and this is being done currently, only the primary path is used.
> Do you have plans to change this? I know that the SDD software for AIX load
> balances between paths (and I think EMC's Powerpaths do for AIX too), DMP
> (from Veritas) for Solaris doesn't.

I have been working with the version of this code included in RH 7.1.
I have code that does round robin routing. I'm working on cleaning it
up and plan to post shortly.

Brian Beattie
IBM Linux Technology Center - MPIO/SAN
503.578.5899 Des2-3C-5
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