On Sun, 2003-01-26 at 07:37, Pigeon wrote: > On Sun, Jan 26, 2003 at 03:03:10AM -0600, Ron Johnson wrote: > > On Sat, 2003-01-25 at 21:42, Pigeon wrote: > > > On Sat, Jan 25, 2003 at 12:20:56AM -0800, Paul Johnson wrote: > > > > On Fri, Jan 24, 2003 at 10:21:12PM +0000, Pigeon wrote: > > [snip] > > > Now, I have a UDMA66 HD, which on buffered disk reads in hdparm -t > > > gives rates of about 28Mb/s, both with the onboard VIA controller and > > > a CMD680 PCI card. I also have a Quantum Viking 4.5 SCSI drive and > > > Initio INIC-950P (9100UW) SCSI card. This only gives me around 10Mb/s > > > in hdparm -t. Seems a bit slow to me. hdparm -T gives over 200Mb/s for > > > any drive. > > > > Well, 4.5GB SCSI drives are pretty old, and 10MB/s is SCSI-2's *exact* > > max speed, so maybe you're maxing out the Viking. > > I thought it was 10MHz transfer rate over a 16-bit bus (68-pin cable), > giving 20Mb/s. No? It does seem suspiciously close to the "quantum" of > SCSI speed though. Is there a decent utility that allows me to see > what transfer mode it's using, and tweak it, in the manner of hdparm > and UDMA settings? I've had a look at scsiinfo but it doesn't seem to > be able to tell me what speed the SCSI bus is being driven at.
SCSI-1 5MB/s (8 bit) SCSI-2 10MB/s (8 bit) Wide SCSI-2 20MB/s (16 bit) Besides, who ever maxes out a specification? Even if the disk is Wide SCSI2, to get 50% of theoretical maximum is nothing to sneeze at... > The card itself claims 40Mb/s synchronous; I had expected to get up to > 20Mb/s from the Viking. A faster and larger SCSI drive is next on my > wish list; it's good that SCSI gear is finally becoming available > without having to pay a fortune for it. Yeah, but the problem is that ATA/EIDE is getting better, too -- +---------------------------------------------------------------+ | Ron Johnson, Jr. mailto:[EMAIL PROTECTED] | | Jefferson, LA USA http://members.cox.net/ron.l.johnson | | | | "Fear the Penguin!!" | +---------------------------------------------------------------+ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
