Joshua D. Drake wrote:
> Brad Nicholson wrote:
>
>> I'm investigating a potential IO issue. We're running 7.4 on AIX
>> 5.1. During periods of high activity (reads, writes, and vacuums),
>> we are seeing iostat reporting 100% disk usage. I have a feeling
>> that the iostat numbers are misleading. I can make iostat usage jump
>> from less than 10% to greater than 95% by running a single vacuum
>> against a moderate sized table (no noticeable change in the other
>> activity).
>>
> Well that isn't surprising. Vacuum is brutal especially on 7.4 as that
> is pre background writer. What type of IO do you have available (RAID,
> SCSI?)
>
Data LUN is RAID 10, wal LUN is RAID 1.
--
Brad Nicholson 416-673-4106 bnichols@ca.afilias.info
Database Administrator, Afilias Canada Corp.