Raidtest/3Ware 6000 Throughput

[Don O'Neil]

I would have thought I would at least see the raw single drive throughput,
plus maybe a bit more. I've benched these drives independantly at 20+
MB/second... Is the 3ware card really slowing things down that much with the
RAID-5 overhead?

What "real HW RAID-5" controller would you suggest? I'd like to stick with
IDE/ATA since I have a bunch of drives already.

Am I maybe CPU bound, or have another issue? 

-----Original Message-----
From: owner-freebsd-questions at freebsd.org
[mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Chuck Swiger
Sent: Thursday, March 16, 2006 5:43 AM
To: Don O'Neil
Cc: freebsd-questions at freebsd.org
Subject: Re: Raidtest/3Ware 6000 Throughput

Don O'Neil wrote:
[ ... ]
> Does this seem accurate? Should I only be seeing 4.7 MB/second 
> throughput or is raidtest just not a good way to measure peak throughput?
> 
> Any thoughts would be appreciated.

It does not astonish me that you get 5 MB/s on a RAID-5 config, although if
you used SCSI and/or a real HW RAID-5 controller with significant cache (ie,
64+ MB) that would help the performance by quite a bit.

Use RAID-5 for read-only or read-mostly situations and you'll be better off;
use RAID-10 for write-heavy filesystems instead.

--
-Chuck
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