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12602 - Balancing data with new disks
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Balancing data with new disks
Hi,Thank you for your comments.
Juan
> -----Mensaje original-----
> De: Jim Doll [mailto:jdollZperrigo.com]
> Enviado el: jueves, 15 de enero de 2004 15:21
> Para: DoNotReply@consolut.eu
> Asunto: Re: Balancing data with new disks
>
> We had a High-Availability system that was missing a drive. We
replaced
> it and added it on the fly. We DIDN'T use the "add & balance"
option--we
> added it, then balanced it based on capacity. I watched it run: it
took
> a little off each of the other drives and added it to the new one
until
> they were all equally used up. After that, though, we had different
> periods during the day where the new drive raised an alarm in Ops
> Navigator: it would be over 90% busy, while the other drives were
running
> at 5-10% busy. We tried to balance by usage and still ended up with
the
> same problem. We never learned why we had the difficulty--if the
original
> balancing just happened to take parts of the same file off other
drives or
> some other thing.
>
> Once we refreshed our H/A system from a production backup, the problem
> went away.
>
> If you have the time, I'd vote for option #3.
>
> Jim Doll, Perrigo
>
> >>> jmirZcamper.es 01/15/04 07:20AM >>>
> Hi all,
>
>
>
> This weekend we are installing 20 new disks in our AS400 and we would
> like to balance all data in order to improve the performance.
>
> We think that we have 3 different ways to balance the data:
>
>
>
> 1.- Capacity balance. All data will be shared between disks depending
on
> the capacity. However, we think that is possible that all data of a
> table will be in a single disk.
>
> 2.- Usage balance. All data will be shared depending on a set of
> statistics. Using this system we could obtain a small disk full of
data
> while the new big disks will be rather empty.
>
> 3.- Apply a backup and restore of the R3<SID>DATA library. In this
case
> all the data will be shared among the disks in a most equilibrate way,
> where the data of all the tables will be shared in different disks.
>
>
>
> Is it true?. Do you know other ways to balance the data? Is the 3rd
> solution the best one?. What will you do in our case? (The database is
> 400 GB)
>
>
>
> Thanks for your comments.
>
>
>
> Best regards,
>
> Juan Mir
>
>
>
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
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