Hardware RAID Level & Performance

[David R Bosso]

--On Thursday, February 17, 2005 10:56 PM +0100 Jure Pe ar 
<pegasus at nerv.eu.org> wrote:

> Because of that (and because I already have FC infrastructure in place)
> I'm mostly interested in standalone disk enclosures doing their own raid
> with cheap sata drives and big caches with batteries.
>

I just ran across these today:

<http://www.synetic.net/Synetic-Products/SyneRAID-Units/SyneRAID6-16-3U/SyneRAID6-SATA.htm>

No experience with them, but they're the best specs I've seen for SATA 
external RAID - decent processor and NCQ support.

We've had good luck with the LSI Megaraid 320-2X and 320-4X SCSI cards. 
The older, non "X" cards don't use the newer Intel xscale chips and really 
can't keep up for RAID-5 based on the testing I did.

I've seen pretty poor RAID-5 performance from an LSI SATA card, the 150-6. 
It uses one of the older Intel i960 based IOP chips.

-David
---
Cyrus Home Page: http://asg.web.cmu.edu/cyrus
Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html