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March 2003, Week 4

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Subject:
Re: Model 20 Disk array
From:
Goetz Neumann <[log in to unmask]>
Reply To:
Goetz Neumann <[log in to unmask]>
Date:
Wed, 26 Mar 2003 02:17:26 -0600
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Gilles Schipper wrote after Tim Atwood:
[snip]

> HP-UX offers a capability known as controller failover. This feature is NOT
> available with the HP3000.

[snip]

> Automatic controller failover is NOT possible with MPE/iX.


> At 07:31 PM 2003-03-24, Atwood, Tim (DVM) wrote:
>
>>I will jump in and say "no". At least not in the same sense as HP-UX. MPE
>>does not recognize two different controllers pointing to the same set of
>>LUN's. MPE does not know how to handle accessing the same data through two
>>different paths.

[snip]

To provide a somewhat more correct picture, MPE _does_ offer such a
facility called HAFO (High Availability FailOver), IIRC since 6.5
Express 2.

It is true however that support of this is _currently_ limited to
direct F&W SCSI connected XP256 disk arrays only.  So it is not
supported (and AFAIK also does not work!) on any other (dual ported)
disk array product (which includes the array this thread is about).

HTH,
Goetz.

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