On Dec 1, 2011, at 7:52 AM, Lamar Owen wrote:
> On Wednesday, November 30, 2011 06:40:44 PM Ross Walker wrote:
>> I have heard of people setting their PERCs in pass-through mode and doing software RAID, or setting the drives up as a bunch of single disk RAID0 drives and doing software RAID, so I wouldn't rule it out.
>
> FWIW, I've done this in testing, and for a two-socket dual-core Dell PE 2850 we have here, the Linux software RAID was substantially faster than the PERC (U320 SCSI) built-in RAID. Speed was checked with bonnie++ while the box was normally loaded.
>
> In both cases, CentOS 5 was the OS installed.
>
> YMMV.
----
I think the actual controller might make a difference and also details such as whether/how much write back cache was available and also, which RAID level would likely be significant too. Almost guessing that you were talking about a PERC 3/Di.
Craig
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