Thanks to those who took the time to reply, especially (in no particular
order):
Danny Petterson
Ruben Cortegoso
Tom Webster
Alan Davis
Bryan Lavelle at Compaq
Alan_at_nabeth.cxo.dec.com
The failover configuration I describe is called "multipathing" and is
supported under Tru64 5.X, but not the earlier version we're running here.
> ----------
> From: Kingsley Sawyers
> Sent: 07 November 2000 16:08
> To: 'tru64-unix-managers_at_ornl.gov'
> Subject: RAID reconfiguration
>
> System:
> Alphaserver 1200 running 4.0d
> Single KZPBA-CB SCSI host adaptor, feeding from
> 2x HSZ70 RAID controllers in pure failover configuration, controlling
> 42x SCSI spindles (mainly in RAID5 arrays, contained in ESA10000 cabinet)
>
> Issue:
> We intend to improve IO bandwidth by the installation of a second KZPBA.
>
> Queries:
> I'd like to reconfigure the RAID sets such that half have a preference for
> each HSZ70, each of which feeds into one KZPBA, but retain the failover.
> So, if either HSZ fails we fail back to all traffic through the other and
> its partner KZPBA, but don't lose the system.
> - Is this a legal/ supported system configuration?
> - Can the RAID set channel preferences be changed on the fly, to make half
> of them utilise the 'other' HSZ70 with its new KZPBA?
>
> I don't need to know how to do it necessarily, as our reseller will be
> supplying and fitting the hardware. But, they're pushing for us to buy
> two more HSZ70's ($$$'s!!) and I'm not convinced that this is necessary
> except to improve their sales figures.
>
> Thanks
>
> Kingsley Sawyers
> Oracle DBA
>
Received on Mon Nov 20 2000 - 09:33:21 NZDT