From owner-freebsd-hackers@FreeBSD.ORG  Wed Apr 23 08:42:42 2003
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From: "Andrew Kinney" <andykinney@advantagecom.net>
Organization: Advantagecom Networks, Inc.
To: freebsd-hackers@freebsd.org
Date: Wed, 23 Apr 2003 08:43:22 -0700
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Subject: dump routine for mlx devices
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Hello,

I need to get a crash dump and the only disk controller on the 
system in question is an eXtremeRAID1100 (DAC1164P) handled 
through the mlx driver.  I'm running FreeBSD 4.7-release + security 
fixes.

dumping to dev #mlxd/0x20001, offset 9372672
dump failed, reason: device doesn't support a dump routine


Before I go try to write my own dump routine: Has anyone else 
already invented that wheel or is the wheel too difficult a pursuit in 
this case due to peculiarities of this hardware?

I've only had a quick glance at the source under /usr/src/sys/dev/ 
and at first glance the only devices that appear to support crash 
dumps are aac_disk, ata_disk, ida_disk, and ccd.

That last one (ccd) could be a point of interest. Is it possible to 
create a ccd device from a spare mlxd device?  If so, is it also 
feasible to swap and dump to that ccd device or would it fail 
because the "real" device didn't support dumps?

Sincerely,
Andrew Kinney
President and
Chief Technology Officer
Advantagecom Networks, Inc.
http://www.advantagecom.net