[SOLVED] RE: Interesting SCSI-Problem with Quantum Atlas10K3 (from freebsd-stable)

[Kipp Holger]

It was after all a defect disk drive (one of those three drives
had an 'oscillating' writing performance (ie between 0 bytes/sec
and maximum throughput) which gave all sorts of interesting behaviour
within vinum as raid 5.

This was very hard to debug under FreeBSD 4.10 and might explain
why changing the available command queue length first looked like
solving the problem... (because it changed the timing issues of
the bad drive).

Regards,
Holger Kipp


-----Original Message-----
From:	Matthew Jacob [mailto:mjacob44 at yahoo.com]
Sent:	Wed 29.09.2004 22:12
To:	Kipp Holger; freebsd-scsi at freebsd.org
Cc:	
Subject:	Re: Interesting SCSI-Problem with Quantum Atlas10K3 (from freebsd-stable)

It's not a command queue length issue.

The message indicates that we had a disk command timeout that when we
turned around and called the interrupt service routine that the command
did get serviced after all.

You didn't say what kind of MPT h/w you're running on.



	
		
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