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Re: RAID 0 not as fast as expected

  • From: "Craig A. James" <cjames(at)modgraph-usa(dot)com>
  • To: Alan Hodgson <ahodgson(at)simkin(dot)ca>
  • Cc: pgsql-performance(at)postgresql(dot)org
  • Subject: Re: RAID 0 not as fast as expected
  • Date: Thu, 14 Sep 2006 14:35:00 -0700
  • Message-id: <4509CB04(dot)4020605(at)modgraph-usa(dot)com>
Alan Hodgson wrote:
On Thursday 14 September 2006 11:05, "Craig A. James" <cjames(at)modgraph-usa(dot)com> wrote: 
I'm experiment with RAID, looking for an inexpensive way to boost
performance.  I bought 4 Seagate 7200.9 120 GB SATA drives and two SIIG
dual-port SATA cards.  (NB: I don't plan to run RAID 0 in production,
probably RAID 10, so no need to comment on the failure rate of RAID 0.)



Are those PCI cards?  If yes, it's just a bus bandwidth limit.


Ok, that makes sense.

  One SATA disk = 52 MB/sec
  4-disk RAID0  = 106 MB/sec
PCI at 33 MHz x 32 bits (4 bytes) = 132 MB/sec. 

I guess getting to 80% of the theoretical speed is as much as I should expect.

Thanks,
Craig
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