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From: cdold@starfish.Convergent.COM (Clarence Dold)
Newsgroups: comp.periphs
Subject: Measured disk speeds
Keywords: SCSI ST506 X-SMD
Message-ID: <951@starfish.Convergent.COM>
Date: 17 Feb 89 18:58:50 GMT
Distribution: usa
Organization: Convergent Technologies, San Jose, CA
Lines: 20


I just got a SCSI Micropolis 380MB 5.25" drive, which prompted me to 
check some raw transfer rates on two UNIX systems that we have.
I transferred 7.6 MB from disk to null on active systems.

#time dd if=/dev/rdsk/c0d0s2 of=/dev/null bs=128k count=60
System		Interface	Disk		Seconds	Rate
12.5MHz 68020 	ST506 	Hitachi DK511-8		20.2	380 KBpS
25  MHz 68020	ST506 	Hitachi DK511-8		19.0	404 KBpS
		X-SMD 	NorTel 8412		11.11	691 KBpS
		SCSI 	Micropolis 1578		8.9	862 KBpS

Copying point to point on the same disk.
#time dd if=/dev/rdsk/c0d0s2 of=junk bs=128k count=60
25 MHz 68020	SCSI 	Micropolis 1578		26.8	573 KBpS (total)

-- 
Clarence A Dold - cdold@starfish.Convergent.COM         (408) 434-2083
                ...pyramid!ctnews!professo!dold         MailStop 18-011
                P.O.Box 6685, San Jose, CA 95150-6685