Re: Upgrading to RAID 5

[Billy Rowe <billyrowe@xxxxxxx>]

Allen, Stuart wrote:
> 
> Hi,
> We are due to upgrade a system from 50gb (70% util) non-raided, to 82gb with
> raid 5.
> 
> 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?
> 

If you are going to do unload/reload from tape then yes your data will
be spread across all disks by the system,  If you are just adding new
drives then no the data will not be spread from your existing disks
across the new disks but if you are on V4R3 or higher I beleive you now
have a Disk Balance command.

If IBM is going to do the install, ask your CE for a install time
estimate.

I would wait and do the Reclaim storage after completion.

We have 1 AS/400 running V4R1 that has all drives raided including
Load/Source,
we have 4 other AS/400s on previous releases that have the Load/Source
mirrored just because you can't raid the load/source until V4R1.

hope this helps!!

billy

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