siisch1: Error while READ LOG EXT

Jeremy Chadwick freebsd at
Wed Feb 8 21:32:49 UTC 2012

On Wed, Feb 08, 2012 at 01:27:23PM -0800, Jeremy Chadwick wrote:
> On Wed, Feb 08, 2012 at 04:00:57PM -0500, Mike Tancsa wrote:
> > Ever since I added a new PM, I have been seeing a new error (READ LOG EXT) along with a the odd slot timeout error.

BTW, something I forgot to cover in my reply: the slot number shown in
the output (e.g. "Timeout on slot NN") has nothing to do with "port
number", "connector", or anything like that.  It's an internal
controller feature; AHCI offers the same thing.  I performed rudimentary
analysis on this back in April 2011 by reviewing the code and a small
write-up on it (semi-technical):

Taken from my post at that time, which is what I'm wanting to relay
here: "Timeout on slot N" != SATA port N.  Two unrelated things.

| Jeremy Chadwick                                 jdc at |
| Parodius Networking            |
| UNIX Systems Administrator                 Mountain View, CA, US |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

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