This totally depends on the chipset manufacturer. A $50 Adaptec SATA card isn't going to burn a hole in the case. Our Opteron file-server box is running a 320GB Barracuda RAID 5 on a 64-bit 3ware controller. It smokes every Adaptec SCSI RAID I have on site with ~500MB/sec read throughput and near 300MB/sec write over FTP on a 100MB full-duplex switch. For the best money/speed, SATA RAID is the way to go. For the overall best in speed, consider a multi-channel high-end SCSI system. Fiber is definitely the cleanest, but it's not cheap. A few thousand in drive hardware costing and you'll probably end up reviewing and comparing SATA again. :P But hey, if you've got the money, go full-blown 64-bit multi-channel SCSI. Keep in mind that when a 200GB drive dies on a SATA array, you're only out $150-200. Compare that with lower capacity 15K RPM SCSI drives running $400-$600.
Glen > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Claus Derlien > Sent: Tuesday, August 02, 2005 4:54 AM > To: [email protected] > Subject: RE: [U2] [OT?] SATA vs SCSI drives > > > first of all, i can't give definitive information only information about our > experience with the two different kind of > i/o subsystems. > > We have two identical servers cpu/os but on the test server we have SATA > drives in a no raid configuration > on the production server we have SCSI in raid 1+0 configuration, and the > speed in database operations is far better on > the SCSI system than on the SATA system... > When we test with multiple users and heavy batch run on the SATA system we > have experienced i/o freeze for up to 3 > seconds, on the SCSI system our users can't even detect a heavy batch run... > > I can't imagine you will ever get SCSI performance out of a SATA drive unless > you are on a single user system, > the primary benefits of a SCSI subsystem lies in its ability to command > tagging and sorting according to drive geometry, > thus enabling multible users read/write requests to be sorted for best usage > of the drive. > > Some of the sorting of i/o commands will be handled by the OS, but to be > fair, SCSI drivers have been under heavy > scrutiny for best performance for more than a decade, so SCSI drivers will > probably still be somewhat ahead of SATA drivers.. > > best regards from Denmark > > Claus Derlien > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] Behalf Of Ross Ferris > > Sent: Tuesday, August 02, 2005 3:48 AM > > To: [email protected] > > Subject: [U2] [OT?] SATA vs SCSI drives > > > > > > Somewhat off topic I know, but does anyone have any definitive > > information re these 2 technologies? > > > > Traditionally I've always used SCSI drives, as many years ago we > > discovered that although the specs if EIDE looked good on paper, in > > practice they were sub-optimal. > > > > Whilst I could do my own tests (have just installed a > > Windows/SATA box), > > I figure others here may have already done the investigation work. > > > > FWIW I'd just be looking at a little IBM x306 with RAID level > > 1 via the > > integrated RAID SATA - nothing too punishing, only around 50 users > > (anything more and I'd just feel safer with SCSI), and no > > external cache > > to the drive. > > > > Once more, on paper I see transfer rates of 1.5Gbs vs 320 on U320 SCSI > > drives, but slower RPMs on the SATA to the 15K SCSI's, so I'm guessing > > (know in my gut?) that SCSI makes sense, but ... Any comments from > > people who have kept more abreast of hardware than I have are welcome > > :-) > > > > > > Regards, > > > > > > Ross Ferris > > Stamina Software > > Visage - an Evolution in Software Development > > ------- > > u2-users mailing list > > [email protected] > > To unsubscribe please visit http://listserver.u2ug.org/ > > > > ************************************************************** > > ************** > > Denne mail er blevet scannet af http://www.virus112.com > > ************************************************************** > > ************** > > > > > > Frie Funktionfrer - faglig organisation og tvfrfaglig a-kasse - www.f-f.dk > > ************************************************************************************************************************** > ************* > Denne email og alle filer vedlagt som bilag kan indeholde fortroligt > materiale, der kun er beregnet for adressaten, > og maa ikke udleveres eller kopieres til uvedkommende. Har De ved en > fejltagelse modtaget denne email, bedes > De venligst omgaaende meddele os dette pr. telefon : 6313 8550. Paa forhaand > tak. > ************************************************************************************************************************** > ************* > This email and any files transmitted with it may contain confidential > information intended for the addressee(s) only. > The information is not to be surrendered or copied to unauthorised persons. > If you have received this > communication in error, please notify us immediately by telephone: +45 6313 > 8550. Thank you. > ************************************************************************************************************************** > ************* > ------- > u2-users mailing list > [email protected] > To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list [email protected] To unsubscribe please visit http://listserver.u2ug.org/
