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12599 - Balancing data with new disks
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Balancing data with new disks
We had a High-Availability system that was missing a drive. We replaced it andadded 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
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