oups,

i changed for RAID 10(strip and mirror)....

-----Original Message-----
From: James Thornton [mailto:[EMAIL PROTECTED]
Sent: 2 aout, 2004 17:32
To: Stephane Tessier
Cc: 'Scott Marlowe'; [EMAIL PROTECTED];
[EMAIL PROTECTED]
Subject: Re: [PERFORM] my boss want to migrate to ORACLE


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
______________________________________________________
Internet Business Consultant, http://jamesthornton.com


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