Re: RAID and Oracle

We have used RAID level 5 and 6 for several years

RAID 5 does have a write penalty because of the CRC and double writes

So what you need to consider is how much writing you do vs reading on most systems the reads are about 90 % of all disk I/O and this is ok for RAID 5

Also most controllers have hardware I/O caching for reads and writes. We have 32 meg of memory on our level 5

If you are doing a lot of down loads from a mainframe then you should consider RAID level 6

kfein wrote:
>
> tsv_at_flash.net (Tim Vannaman ) wrote:
> [snip]
> >Better watch it, RAID-5 and Oracle do not mix very well. The Oracle
> >instructor
> >at the performance and tuning class advised against using them.
> >
> >Tim.
> Tim,
> other than the instructors comment, is there any other documentation or
> information available to me about ORACLE7 and RAID? Is this a specific
> hardware/controller issue? Even Oracle's "SIZER" application for NT/Proliant
> recommends RAID5 for data and cotrol files and RAID1 for system.
>
> Thanks in advance,
> kevin
> --
> ******************************************************************************
> * K. E. Fein "To thy own opinions be true.. *
> * 520/747-9900x4424 *
> * kef_at_tucsonpo.jewelway.com ...those expressed herein are but mine" *
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  Received on Wed Dec 18 1996 - 00:00:00 CST