Stephane Tessier wrote:
> I checked and we have a 128 megs battery backed cache on the raid
> controller...
>>we have space for more ram(we use 2 gigs on possibility of 3 gigs)
>>iowait is very high 98% --> look like postgresql wait for io access
>>raid5 -->raid0 if i'm right raid5 use 4 writes(parity,data, etc) for each
>>write on disk
>
> Just get battery backed cache on your RAID controller. RAID0 is way too
> unreliable for a production environment. One disk dies and all your
> data is just gone.
I'm the one who sent the e-mail about RAID 5's 4 writes, but I suggested
you look at RAID 10, not RAID 0.
--
James Thornton
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Internet Business Consultant, http://jamesthornton.com