[1859] in linux-scsi channel archive
SCSI I/O performance under Linux
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Mon May 12 21:02:33 1997
From: schaefer@alphanet.ch (Marc SCHAEFER)
Date: 12 May 1997 20:42:51 +0200
Apparently-To: linux-scsi@vger.rutgers.edu
To: ;@unlisted-recipients (no To-header on input)
Hi,
I have been dd ing with a Linux 2.0.27 with a Pentium 100
and an Adaptec 2940 UW on a DCHS IBM disk (supposed to
be able to do 7 MB/s). I can't get more than 4-5 MB/s.
There is 32 MB of memory in the system (ASUS P/1P55TP4)
I tried
dd if=/dev/sda of=/dev/null
dd of=/dev/sda if=/dev/zero
Bonnie, iozone and others are not faster.
What are the maximum typical speed you get with
such disks, or even with FAST RAID-0 array ?
Has someone compared a hardware RAID-0 to ``md''
software implementation ?
Also, what's the typical transfer size on a
disk I/O operation ?
Thank you for any pointers.
