[736] in linux-scsi channel archive
scsi disk speeds
daemon@ATHENA.MIT.EDU (Baba Z Buehler)
Tue Oct 31 19:16:18 1995
Reply-to: Baba Z Buehler <baba@beckman.uiuc.edu>
From: Baba Z Buehler <baba@beckman.uiuc.edu>
To: linux-scsi@vger.rutgers.edu
Date: Tue, 31 Oct 1995 10:12:01 -0600
I've got a question regarding SCSI disk speeds. I've got some various SCSI hds
around here, and I've been timing some of them with Linux and hdparm. I'd like
to know if these numbers look roughly correct.
The first is a SEAGATE baracuda 2gig drive.
The second is a Sun (SEAGATE) 2gig drive.
The third is a Conner 2gig drive.
Controller is a BusLogic 946C (PCI) on a P133. Tests were run under very low
system load. I ran multiple tests and the results were all very close to what
I've put here.
1. Do these numbers look reasonable? (I would have expected the Seagate
baracuda drive to perform better than this.)
2. Is hdparm even a good way to test this?
TIA for any information/comments,
baba
Vendor: SEAGATE Model: ST32550N Rev: 0013
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
/dev/sda:
Timing buffer-cache reads: 32 MB in 1.04 seconds =30.77 MB/sec
Timing buffered disk reads: 16 MB in 4.53 seconds = 3.53 MB/sec
Estimating raw driver speed: 16 MB in 4.01 seconds = 3.99 MB/sec
Vendor: SEAGATE Model: ST12400N SUN2.1G Rev: 8720
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 5, lun 0
/dev/sdb:
Timing buffer-cache reads: 32 MB in 1.03 seconds =31.07 MB/sec
Timing buffered disk reads: 16 MB in 4.08 seconds = 3.92 MB/sec
Estimating raw driver speed: 16 MB in 3.56 seconds = 4.49 MB/sec
Vendor: CONNER Model: CFP1080S Rev: 4649
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
/dev/sda:
Timing buffer-cache reads: 32 MB in 1.45 seconds =22.07 MB/sec
Timing buffered disk reads: 16 MB in 3.78 seconds = 4.23 MB/sec
Estimating raw driver speed: 16 MB in 3.05 seconds = 5.24 MB/sec
--
# Baba Z Buehler - 'Hackito Ergo Sum'
# Beckman Institute Systems Services, Urbana Illinois
#
# I'm still learning to count backwards from infinity.
#
# PGP public key on WWW homepage and key servers (key id: C13D8EE1)
# WWW: http://www.beckman.uiuc.edu/~baba/
