On Tue, Sep 18, 2001 at 08:39:46PM +0100, Adrian Bridgett wrote:
> 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.
>
> In fact that brings up another point - which path do you use by default? If
> you have the SAN situation where you have a farm of servers each with two FC
> cards two two FC switches and then to two ports on a storage array, you
> don't want everything going to the first switch. Just picking one path to
> use at random would be preferable (unless you want to swap every other
> servers cables around).
I think the multipath driver would benefit from something like the
different modes in the new network bonding driver:
* round robin
* active backup policy
* XOR
(Not sure if XOR would be needed for md?)
I think some other ideas can be stolen from the bonding driver as well,
as the problem is very simular - e.g. the concept of low level drivers
(optionally) delivering status information, so md don't have to try and
fail to detect a link is down, and the timeout settings.
-- Ragnar Kjørstad Big Storage - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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