TIA.
On Sat, 2002-10-05 at 19:09, Austin Gonyou wrote:
> The latest driver does not load balance with STK D178 array either.
>
> I've discovered why, but I'm not sure which direction to take with
> helping out to get better closure/resolution with this.
>
>
> The cause of the problem is that the QLogic driver doesn't to
> transparent LUN masking it seems. The reason this is a problem, is that
> when the LSI/StoragTEK controllers present their luns, AVT is enabled.
> This causes LUN "ghosting" down each path from the storage to the HBAs.
> This becomes a problem because when the Linux Driver is told to perform
> load balancing via static bindings, the LUNs are now out of order.
> (whether LUN ghosting is happening or not).
>
....
> Linux is not allowed to address LUNs out of sequence, so searching for
> further LUN numbers stops after 0, since 2 is the next one.
>
> Is there a way to resolve this, either at the driver level, IMHO the
> place it *should* happen. At the storage level, the place that it could
> also happen, or in the Kernel?
>
> For the time being, I'm using a temporary load balanced setup for
> performance reasons since we just extended our two primary loops from 1
> tray each, to 3 and 4 trays. Please advise ASAP, as in this
> configuration, we cannot fail-over.
>
> TIA
> --
> Austin Gonyou <austin@coremetrics.com>
> Systems Architect
> Coremetrics, Inc.
> Cel: 512-698-7250
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