Fw: smartmontools

Thought this discussion might be better targeted at linux-aacraid-devel.
-Matt

-- 
Matt Domsch
Sr. Software Engineer
Dell Linux Solutions www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com

---------- Forwarded message ----------
Date: Mon, 16 Jun 2003 06:56:37 -0500
From: Douglas Gilbert <[email protected]>
To: Christopher McCrory <[email protected]>
Cc: Bruce Allen <[email protected]>, [email protected]
Subject: Re: smartmontools


Christopher McCrory wrote:
> Hello...
>
> Sorry for the delay as this machine was testing other stuff for a
while:
>
> [root@office18 /]# /usr/sbin/smartctl  -r ioctl,3 -a /dev/sda
> smartctl version 5.1-11 Copyright (C) 2002-3 Bruce Allen
> Home page is http://smartmontools.sourceforge.net/
> 
>  [inquiry: 12 00 00 00 24 00 ]  status=0
>   Incoming data, len=36:
>  00     00 80 02 02 1f 00 00 32  44 45 4c 4c 20 20 20 20
>  10     50 45 52 43 52 41 49 44  20 4c 65 67 61 63 79 20
>  20     56 31 2e 30
> Device: DELL     PERCRAID Legacy  Version: V1.0
>  [inquiry: 12 01 80 00 40 00 ]  status=0
>   Incoming data, len=64:
>  00     00 80 02 02 1f 00 00 32  44 45 4c 4c 20 20 20 20
>  10     50 45 52 43 52 41 49 44  20 4c 65 67 61 63 79 20
>  20     56 31 2e 30 00 00 00 00  00 00 00 00 00 00 00 00
>  30     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> Serial number: 
> Device type: disk
> Local Time is: Sun Jun 15 10:39:48 2003 PDT
>  [test unit ready: 00 00 00 00 00 00 ]  status=0
>  [mode sense: 1a 00 1c 00 40 00 ]  status=0
>   Incoming data, len=64:
>  00     00 06 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  10     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  20     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  30     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  [mode sense: 1a 00 5c 00 40 00 ]  status=0
>   Incoming data, len=64:
>  00     00 06 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  10     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  20     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  30     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> scsiModePageOffset: bad resp_len=1 offset=4 bd_len=0
> Device supports SMART and is Disabled
> scsiModePageOffset: bad resp_len=1 offset=4 bd_len=0
> Temperature Warning Disabled or Not Supported
>  [log sense: 4d 00 40 00 00 00 00 00 fc 00 ]  status=0x1
>   ioctl status=0x1 but scsi status=0, fail with ENODEV
> Log Sense for supported pages failed [No such device]
>  [request sense: 03 00 00 00 12 00 ]
> Message from syslogd@office18 at Sun Jun 15 10:39:48 2003 ...
> office18 kernel: Unhandled SCSI Command: 0x4d.
>
>
> Then system hangs

Christopher,
Thanks for the feedback.

Devices that implement a SCSI target need to respond to the
following SCSI commands (at the very least):
   - a simple INQUIRY
   - READ CAPACITY
   - READ and WRITE
   - at the very least not lock up on a MODE SENSE
So the aacraid seems to have much in common with iee1394
sbp2 disks (ATA disks with a bridge) and USB mass storage
disks (again ATA disks with a bridge).

The responses shown above to commands sent by smartcl to
the aacraid are:
   - sensible for a simple INQUIRY
   - to a INQUIRY requesting VPD page 0x80 it responds
     as if it were a simple INQUIRY: wrong
   - to both (6 byte) MODE SENSE commands the responses
     are wrong
   - to the first LOG SENSE command the aacraid seems to
     hang (or is in its death throes)

So we need a black list or some "three strikes and your
out" type logic to handle the aacraid. In my local copy
I have started adding some sanity checks to "non-simple"
INQUIRY responses and MODE SENSE responses.

BTW smartmontools 5.1-12 (the version after the one used
above) refines its LOG SENSE commands to do a double fetch
(first it fetches a 4 byte response to find the response
length, then the "real" fetch). This may fix the problem
(but I wouldn't hold my breath); it was added for BusLogic
HBAs.

Suggestions?

Doug Gilbert


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