Stephane Tessier wrote:

I checked and we have a 128 megs battery backed cache on the raid

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
Internet Business Consultant,

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