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Subject:	Re: Does MPE support HAFO on FWD SCSI controllers?
From:	Goetz Neumann <[log in to unmask]>
Reply To:	Goetz Neumann <[log in to unmask]>
Date:	Tue, 20 Jul 2004 03:05:22 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (27 lines)

 Thomas M. Root wrote:

>  A more recent read of the HAFO manual leads me to believe
> that HAFO will work with SCSI controllers provided that the disk array can
> be configured to present each logical drive on two SCSI channels using the
> same SCSI ID on each controller.  Can anyone tell me if this is correct?

Yes, this is correct.

The caveat here is to make sure you are not overloading your
HVD SCSI channels with IO, or HAFO might make 'false positive'
path 'switch' decisions because of IO timeouts.

If you get the most recent version of HAFO patches for
7.0 or 7.5, you can disable timeouts as a trigger for
failover events ( in case you are getting false positive
failovers ).  It is not recommended to disable timeouts,
until you are sure you would otherwise see lots of 'false
alarms'.

HTH,

Goetz

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