RE: Upgrading to RAID 5

["Allen, Stuart" <sallen@xxxxxxxxxxxx>]

Thanks Billy,

Will the data get spread slowly as it is written? - so i'll have 70% util on
12 disk arms, and almost 0 on the rest?
We're V4R2 - are there any other ways to balance the disk load as i don't
really want to splat the system & reload from tape!

Regards
Stuart


> -----Original Message-----
> From: Billy Rowe [SMTP:billyrowe@usa.net]
> Sent: Tuesday, May 11, 1999 4:48 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: Upgrading to RAID 5
> 
> Allen, Stuart wrote:
> 
> > 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)?
> 
> 
> 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.
> 
> hope this helps!!
> 
> billy
> 
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