Re: Disk Reconfigure Question

Newer controllers use a different sector size on disk drives as a
prerequisite for cache support (even if no RAID is used).
They will work with old (6530-style) formatting, but no benefit from cache
will be available.
So you will have to reformat the drives. Basically, removing disk from
configuration and adding it back should do the trick.
You can do it one disk at a time, and then reload will not be necessary.
But I would recommend to save system, reconfigure drives and then restore
everything back.
This probably will not be faster but resulting disk configuration will be
better balanced.

Best regards
    Alexey Pytel



Michael A Ross <michael.a.ross@usa.net> on 01/18/99 04:06:51 PM

Please respond to MIDRANGE-L@midrange.com

To:   MIDRANGE-L@midrange.com
cc:    (bcc: Alexei Pytel/Rochester/IBM)
Subject:  Disk Reconfigure Question





Hello All,

Thanks in advance for any help offered.

We are looking at reconfiguring the DASD on a V3R7 model 400 2131 AS/400.
The machine has 8 6605 drives and 8 6606 drives for a total of 14 gb(7
usasable after mirroring). The reason we are going to reconfigure the dasd
is that in order to mirror the dasd we are using a 6530 controller that has
no cache and is causing a performance problem.

We are going to either
     1) replace a 6530 controller with a higher speed controller(6522) and
leave the dasd mirrored
     2) unmirror the drives, remove the 6605 (1gb) drives from use,  move
all
the 6606 drives to the 918B IOP (disk controller with a cache).

My question is will we have to do a restore as a result of either option?

Thank you,

Michael

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