Hi,
I'm encuntering a relatively high iowait percentage
when my hot backups are running. The platform is Sun
(E420 2cpu running SunOS 5.7) with an A1000 disk array
(8 9Gb drives, hardware Raid-5). The array is one
volume and all DB components (redo, archive, data,
index, system, etc.) are on the
1. depends on the stripe width, data may be on one or many drives, parity
will always get written to all.
2. I believe your performance will be better; you have 6 drives for data,
and 4 for archive/redo. That equates to 12 drives over the previous 8.
However, you were using all eight for
Isn't it 3 drives for data, not 6, because of the
mirroring? I agree, mirroring the extra 4 (9Gb) drives
isn't necessary because this can be accomplished via
the DB config.
Veritas is also being used on the existing array and
the sys admin seems to think that we've got extra
overhead for that on
Hi Walter,
It looks like you're having a bottleneck on your
controller during a hot backup. This is a result of
(1) reading the data then (2) writing the data and
compressing the data within the same controller.
To answer your questions:
1. During RAID 5, all your disks are being written to
and
