fwhite@bbn.com (Fred White) (06/12/91)
I've been able to glean the following measurements of disk speed on an 040 NeXT from back issues of comp.sys.next. I was wondering if anyone has the corresponding numbers for the Maxtor 8380S and 8780S and the Seagate ST1480? I'm trying to narrow down what disk to buy. Thanks! Disk Transfer rate (read) -------------------- -------------------- Micropolis 1588-15 1.2MB/s QUANTUM LP105S 926172 bytes/s FUJITSU M2263S-512 841499 bytes/s (SCSI-2 mode) FUJITSU M2263S-512 771374 bytes/s The benchmark: sylvester> sudo disk /dev/rsd0a disk name: QUANTUM LP105S 910109405 disk type: fixed_rw_scsi Disk utility disk> read starting block? 0 # sectors per transfer? 16 number of transfers? 1000 sector increment? 16 16384000 bytes in 17690 ms = 926172 bytes/s disk> quit Fred White Bolt, Beranek, and Newman, Inc. fwhite@bbn.com 150 CambridgePark Drive 617 873-3536 Cambridge, MA 02140 617 873-8202 (fax)
tempest@ecst.csuchico.edu (Kenneth K.F. Lui) (06/13/91)
In article <64618@bbn.BBN.COM> fwhite@BBN.COM () writes: > > I've been able to glean the following measurements of disk speed on >an 040 NeXT from back issues of comp.sys.next. My Imprimis, now Seagate 425HH gives 1.1MB/sec. In contrast, the Quantum P105S I have gives a pitiful 450kB/sec--maybe I should reformat it using 2.0/2.1... Ken ______________________________________________________________________________ tempest@ecst.csuchico.edu, tempest@walleye.ecst.csuchico.edu,|Kenneth K.F. Lui| tempest@sutro.sfsu.edu, tempest@wet.UUCP |________________|
miron@cs.sfu.ca (Miron Cuperman) (06/13/91)
fwhite@bbn.com (Fred White) writes: >Disk Transfer rate (read) >-------------------- -------------------- >Micropolis 1588-15 1.2MB/s >QUANTUM LP105S 926172 bytes/s >FUJITSU M2263S-512 841499 bytes/s (SCSI-2 mode) >FUJITSU M2263S-512 771374 bytes/s The quantum 210 does: disk name: QUANTUM PD210S disk type: fixed_rw_scsi Disk utility disk> read starting block? 0 # sectors per transfer? 16 number of transfers? 1000 sector increment? 16 16384000 bytes in 12537 ms = 1307581 bytes/s -- By Miron Cuperman <miron@cs.sfu.ca>
windemut@lisboa.ks.uiuc.edu (Andreas Windemuth) (06/14/91)
In article <64618@bbn.BBN.COM> fwhite@bbn.com (Fred White) writes: > > I've been able to glean the following measurements of disk speed on > an 040 NeXT from back issues of comp.sys.next. I was wondering if > anyone has the corresponding numbers for the Maxtor 8380S and 8780S > and the Seagate ST1480? I'm trying to narrow down what disk to buy. > Thanks! > > Disk Transfer rate (read) > -------------------- -------------------- > Micropolis 1588-15 1.2MB/s > QUANTUM LP105S 926172 bytes/s > FUJITSU M2263S-512 841499 bytes/s (SCSI-2 mode) > FUJITSU M2263S-512 771374 bytes/s > > The benchmark: > > sylvester> sudo disk /dev/rsd0a > disk name: QUANTUM LP105S 910109405 > disk type: fixed_rw_scsi > Disk utility > > disk> read > starting block? 0 > # sectors per transfer? 16 > number of transfers? 1000 > sector increment? 16 > 16384000 bytes in 17690 ms = 926172 bytes/s > disk> quit > > Fred White Bolt, Beranek, and Newman, Inc. > fwhite@bbn.com 150 CambridgePark Drive > 617 873-3536 Cambridge, MA 02140 > 617 873-8202 (fax) Here is some measurements that I made: disk name: MAXTOR XT-8380S disk type: fixed_rw_scsi Disk utility disk> read starting block? 0 # sectors per transfer? 16 number of transfers? 1000 sector increment? 16 16384000 bytes in 28712 ms = 570672 bytes/s disk name: SEAGATE ST1480 disk type: fixed_rw_scsi Disk utility disk> read starting block? 0 # sectors per transfer? 16 number of transfers? 1000 sector increment? 16 16384000 bytes in 19826 ms = 826639 bytes/s disk name: QUANTUM LP105S 910109405 disk type: fixed_rw_scsi Disk utility disk> read starting block? 0 # sectors per transfer? 16 number of transfers? 1000 sector increment? 16 16384000 bytes in 17543 ms = 934093 bytes/s -- Andreas Windemuth +-------------------------------------------------------------------- |Theoretical Biophysics windemut@lisboa.ks.uiuc.edu |University of Illinois Tel: (217)-244-1612 |3121 Beckman Institute Fax: (217)-244-8371 |405 N Mathews, Urbana, IL61801 NeXTmail Ok +--------------------------------------------------------------------
brian@umbc4.umbc.edu (Brian Cuthie) (06/14/91)
In article <64618@bbn.BBN.COM> fwhite@BBN.COM () writes: > > I've been able to glean the following measurements of disk speed on >an 040 NeXT from back issues of comp.sys.next. I was wondering if >anyone has the corresponding numbers for the Maxtor 8380S and 8780S >and the Seagate ST1480? I'm trying to narrow down what disk to buy. >Thanks! > >Disk Transfer rate (read) >-------------------- -------------------- >Micropolis 1588-15 1.2MB/s >QUANTUM LP105S 926172 bytes/s >FUJITSU M2263S-512 841499 bytes/s (SCSI-2 mode) >FUJITSU M2263S-512 771374 bytes/s > >The benchmark: > >sylvester> sudo disk /dev/rsd0a >disk name: QUANTUM LP105S 910109405 >disk type: fixed_rw_scsi >Disk utility > >disk> read >starting block? 0 ># sectors per transfer? 16 >number of transfers? 1000 >sector increment? 16 >16384000 bytes in 17690 ms = 926172 bytes/s >disk> quit > >Fred White Bolt, Beranek, and Newman, Inc. >fwhite@bbn.com 150 CambridgePark Drive >617 873-3536 Cambridge, MA 02140 >617 873-8202 (fax) This is not exactly a good way to benchmark disks. One real problem is that the Quantum drives have a track cache that causes them to appear much faster than they are in actual use. I did this once: mounted a quantum Pro425 and a Seagate ST4385N. I built a duplicate system on the seagate from the quantum. I then changed my default directory to the root of the Quantum's file system and entered the following command: "find . -name brian -print". Needless to say this caused all kinds of disk activity. When the command completed, unsuccesfully, I did an "iostat" and noticed that the Quantum has a real access time of around 20-21 ms. This is a far cry from the advertised 12 ms. Mostly it's the difference between sequencial and random reads. I repeated the above steps with the Seagate and found that it averaged in at about 13 ms. Even this was above the 10.7 ms advertised by the manufacturer. My experience has been that drive specs are like mips. Almost everyone has a different way of measuring the performance of disk drives. And, as you would expect, companies pick the method that favors their product. Obviously, Quantum does sequencial reads. My only real problem with the Imprimis [Seagate] drives, as I have posted here before, is that they make an inordinate amount of noise. Otherwise, they are some of the best and fastest drives around. -brian