Re: disk subsystem performance question

James Howerton wrote:
>
> John,
>
> We have the Hitachi 5800 series with RAID 5. The sales guys also said
> their system is
> "soooo fast we need not worry about such minor details". Don't believe
> them!!! Write speed is "SLOW". After we added bare drives for redo log
> files, archive logs, & conrtol files it made a dramatic difference in DB
> performance. Hitachi & some Sa's don't want to set up RAID 1+0 because
> it makes more work for them than a RAID 5 install.

Within the last month our development box was switched from RAID-1 to RAID-5 because additional disk capacity was required. The big data load job almost doubled in time from 150 minutes to 270 minutes due to the double writes incurred by RAID-5 overhead.

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Author: Charlie Mengler
  INET: charliem_at_mwh.com

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