Date: Thu, 29 Oct 2009 22:49:33 -0500 From: "James R. Van Artsdalen" <james-freebsd-current@jrv.org> To: FreeBSD Current <freebsd-current@freebsd.org> Cc: Alexander Motin <mav@freebsd.org> Subject: CAM/SIIS CAM_CMD_TIMEOUT hangs Message-ID: <4AEA624D.10602@jrv.org>
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I have problems with I/O hanging due to CAM/SIIS not handling the CAM_CMD_TIMEOUT error. Hangs happen every few hundred GB to every few TB. The disks are behind SATA port multipliers. This command un-hangs the drive and lets things run again: # camcontrol reset all I assume this is sending a soft reset to the disk drive but haven't checked yet. Is there a way xpt_done() or such might notice a CAM_CMD_TIMEOUT and inject a "soft reset" request at the head of the I/O queue (to run before the timed-out command retries)?
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