RE: Upgrading to RAID 5

["Alex Moore" <alexm@xxxxxxxxxxxxxxxx>]

Building parity is done via DST (dedicated service tools - normally a CE 
function).  Once built, recovery can be performed
concurrent.  You might find that less time would be spent by reloading your 
system.  At V4R3 on a 620 configuring and protecting
five 6607s in a new parity set took literally minutes.  Recovering protection 
on one disk of a 10 disk parity set took two hours
concurrent with users.

Mirroring is definitely a step above raid 5.  Lost a cache card recently and 
lost all data on my system causing a scratch reload.
No cache involved with mirroring.

Alex A. Moore ~ CIO
Ellis Hosiery Mills, Inc.
alexm@ellishosiery.com <mailto:alexm@ellishosiery.com>

> Can anyone tell me how the actual upgrade will work - will the machine
> re-allocate the storage over the new dasd arms & create the parity
> information during IPL, or is there anything else that needs to be done?
> Any ideas as to how long this will take if so?
> Also, would it be better to do a reclaim storage before or after the upgrade
> (or both)?
>
> Lastly, i have heard that it would be better to mirror the load source, and
> raid the rest.  Any views on this listers?

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