Re: Sun T4 Storage Arrray and BAARF

Ian,

Another drawback of the raidf* that you have to keep in mind, is performance penalty if one of the disks fails. If you don't replace failed disk very fast you can get unpredictable performance penalty, because each read can (will) hit all the disks in the array. Also think about performance of the array during resilvering (after you will replace failed disk). In my opinion the biggest disadvantage of the raidf* arrays is because you will get very big response times during raid failure and immediately after it (until the raid will be fixed/resilvered). Please remember that one of the goals of using raid arrays is to protect data from disk failures, so you have to be prepared for a failure to happen.

But as in every technology, the is no silver bullets and technology expert has to know all the bad and good sides of the technology, to design and implement optimal solution to the problem.

On 8/4/05, MacGregor, Ian A. <ian_at_slac.stanford.edu> wrote:
> RAID 5 has worked well for us. The one notable exception is large hash joins which may do a large number of direct writes to temporary segments.
>
> What are others with T4's doing?
>
> Ian MacGregor
> Stanford Linear Accelerator Center
>
> Ian MacGregor
> Stanford Linear Accelerator Center
> ian_at_slac.stanford.edu
> --
> http://www.freelists.org/webpage/oracle-l
>

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  Edgar
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