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From: Mikhail Teterin <mi+kde@aldan.algebra.com>
To: freebsd-scsi@FreeBSD.org, msmith@mu.org, trhodes@FreeBSD.org
Date: Sun, 17 Apr 2005 14:39:13 -0400
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Subject: speed of a ciss-based pseudo-disk
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Hello!

I have two U320 SCSI drives in a RAID-0 combination attached to HP's
Smart Array 642. This is the dmesg:

ciss0: <HP Smart Array 642> port 0xb800-0xb8ff mem 
0xfea80000-0xfeabffff,0xfeafe000-0xfeafffff irq 29 at device 1.0 on pci4
da0 at ciss0 bus 0 target 0 lun 0
da0: <COMPAQ RAID 0  VOLUME OK> Fixed Direct Access SCSI-0 device 
da0: 135.168MB/s transfers
da0: 69419MB (142171680 512 byte sectors: 255H 32S/T 17423C)

Why is the reported speed only 135.168MB/s? All equipment is U320, so
I'd expect the nominal speed of 320MB/s...

Should I try a different cable? Mine says U320, although the terminator
is marked U160 -- but 135 is not even 160...

Any ideas?

Also, what, if anything, are people using to monitor/control ciss-based
arrays? HP offers software, but only for Linux and Windows...

Thanks!

	-mi