OT: external SATA RAID

Eric Swenson eric at reaction-eng.com
Tue May 11 18:23:02 CDT 2004


I've heard rumors that the next generation of external direct-attach
SerialATA-SCSI raid arrays will have ~120 Mbyte/sec performance, but
I've yet to see real benchmarks of them.

On Tue, 2004-05-11 at 17:05, Eberhard Moenkeberg wrote:
> Hi,
> 
> On Tue, 11 May 2004, Eric Swenson wrote:
> 
> > I can recommend ExcelMeridian to you- their service and support has been
> > absolutely stellar, to the point of overnight-shipping a new raid array
> > to me, twice, when the WD drives they were using had firmware issues.
> >
> > I'm not sure about those specific companies, but you'll want to upgrade
> > to a redhat beta channel kernel, such as 2.4.21-12.EL, to see any decent
> > speed on the scsi devices under RHEL - something about removing the scsi
> > no-affinity patch or something.  Doing so took the speed on my external
> > IDE-to-SCSI raid array from 14MB/s up to 60MB/s.
> >
> > $0.02
> 
> Let me add my two (euro) cents, too:
> 
> Have a look at the triplestore masscope (P-ATA) or masscope+ (S-ATA)
> arrays (www.triplestore.com).
> 
> At my guess, they are the smallest, most rugged designs and best
> performing creations of their classes.
> Almost 50% above all others, and - curios - the cheapest and less "space
> eating" devices in field.
> 
> ftp.gwdg.de (a PE2650) has the whole data part on one single masscope
> array on one scsi channel, and during the release of knoppix-3.4 last
> week (which took about 1/3 of the traffic), this equipment was able to
> saturate the 622 MBit/sec internet connection with ease.
> This is not a result of a simple "read ahead" test situation, but of
> about 1000 or more concurrent I/O processes.
> 
> bonnie++ results of different generations and configurations of the
> masscope arrays are under
> http://ftp.gwdg.de/pub/linux/people/emoenke/ide-raid/.
> 
> Cheers -e




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