From owner-freebsd-scsi  Sat Jun 15 15:45:41 2002
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Date: Sat, 15 Jun 2002 16:42:02 -0600
From: Scott Long <scott_long@btc.adaptec.com>
To: Patrick Thomas <root@utility.clubscholarship.com>
Cc: freebsd-scsi@freebsd.org
Subject: Re: aac problems showing up in dmesg
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On Sat, Jun 15, 2002 at 03:25:58PM -0700, Patrick Thomas wrote:
> 
> Hello,
> 
> I am seeing the following messages in my dmesg:
> 
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** SCSI Channel[0]: Timeout Detected On 81 Command(s)
> aac0: **Monitor** ID(0:00:0); Aborted Command [command:0x2a]
> aac0: **Monitor** ID(0:00:0); Error Event [command:0x2a]
> aac0: **Monitor** ID(0:00:0); Medium Error, Block Range 43539103 :
> 43539198
> aac0: **Monitor** ID(0:00:0); Random Positioning Error
> 
> 
> The bulk of the messages, however, are simply:
> 
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> aac0: **Monitor** ID(0:00:0) Timeout detected on cmd[0x2a]
> 
> 
> Two questions:
> 
> 1) what exactly does this mean, in english :)
> 
> 2) what should I do about it ?
> 
> thanks,
> 
> PT


Those messages are coming directly from the processor on the card and
indicate some sort of problem with drive 0 on channel 0.  It could be
caused by bad cables and/or termination, or it might be that the
drive is starting to fail.  

Scott

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