Re: Tuning, RAID5, and fragmentation and DBWR

dana mn wrote:

> Thanks Dave, Don, and Patrice.
>
> It's hardware RAID, a Compaq GS140 machine, and Oracle on VMS [not my
> choice of OS/hardware]. Limited to one large RAID5 volume.
>
> I'd like to make the most of what's there, because for political
> reasons nothing else will change.
>
> Does it make any sense to increase the number of database writer
> processes on a system with nothing but RAID5 space? Looks like there's
> a bit of slowdown on checkpoints.
>
> Thanks.
>
> - Dana
>
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Good question - I have not worked with a single volume, however, I try to help myself a tad by making fewer redo members than I have disks. Of course I generally use 3 to 5 members per volume and always less than the number of drives per volume. I also generally allow the checkpoints to execute based on redo activity rather timed.

I don't know if this will help your circumstance or not - hopefully.

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