I'll second that. If you are not HA but believe that you're 24x7x365
you need to have a scheduled maintenance window (I'd say at least
quarterly) or you will soon be SOL.

A couple pieces of advice.

1.) I heard at a roadshow that the only SCSI DASD that will be
supported in the near future will be the 140 GB drives. I wouldn't be
buying anything else at this point.

2.) If you are truly 24x7x365 you don't want to break your RAID set
and install drives one at a time. Preferably just do an Option 21 save
and restore the whole thing back to a nice set of 4 140s. That should
give you the capacity to spare for a long time and would probably be
fastest and safest option. If cheap is your goal regardless of
performance, save off your largest libraries or a nice group, then
delete those libraries, add in two 140s, balance and restore.


Scott Ingvaldson
Senior IBM Support Specialist
Fiserv Midwest

-----Original Message-----
From: rob@xxxxxxxxx [mailto:rob@xxxxxxxxx]
Sent: Wednesday, July 02, 2008 12:46 PM
To: Midrange Systems Technical Discussion
Subject: Re: DASD swap on 810?

You didn't say if you were a 24x7x365 shop. If you then you'd better
have a HA solution like Mimix (if management really believes they are
24x7x365 they better put their money where their mouth is). Either way
I strongly recommend just doing the unload/reload. It may actually be
less time in the long run.

Rob Berendt
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755

Sent by: midrange-l-bounces@xxxxxxxxxxxx
07/02/2008 01:41 PM
Please respond to
Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>


DASD swap on 810?

We are in the high 80% range, and I am exploring options to replace the
current drives in our 9406/810. Currently, all 6 slots are occupied with
35GB (model 4326) disk units, under RAID parity protection. I'd like to
replace them with 70GB units.

I know we can break the RAID, offload a drive, and remove for a larger
unit. Can this be done while the system is active (i.e. not restricted
state or DST)? We've done concurrent maintenance for drive replacements,
but am unsure for this type of swap. Obviously we would do a full system
save before and after this operation.

How is the load source handled in this scenario?

Since we have so little free space, we would need to swap one drive,
then another. The third round we should be able to swap two drives, then
two more.

Advice and RTMs appreciated.

Loyd Goodbar

Business Systems

BorgWarner Shared Services


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