SCSI performance / Adaptec vs Seagate

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#3742

From: Richard Braun
Date: Tue, 26 Jan 1993 02:33

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Using a simplistic disk performance test program provided by a drive
manufacturer, I came up with the following surprising result:

	The 8-bit Seagate ST02 is nearly 3 times faster than the
	16-bit bus-mastering Adaptec 1542A.

The program measures transfer rate, average seek time, track-to-track
seek time, and a so-called "performance index".  With the drive
low-level formatted for the Seagate's disk geometry, I get 3.5ms
track-to-track time and a 30 performance index.  Reformatted for the
Adaptec, the numbers are 4.9ms and 11.6.

Why might this be?  Is it the different head/sector mapping (64 vs. 63
heads, I think), or is the Adaptec just plain slower?  Is it possible/helpful
to optimize the controller/device driver to match the physical disk
characteristics (15 heads, 1632 cylinders)?

-rich

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From: richb@jti.com (Richard Braun)
Newsgroups: comp.os.msdos.misc,comp.os.linux,comp.sys.ibm.pc.hardware
Subject: SCSI performance / Adaptec vs Seagate
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Date: 26 Jan 93 02:33:21 GMT
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