From mboxrd@z Thu Jan  1 00:00:00 1970
From: Charles Slivkoff <slivkoff@cmu.edu>
Subject: Re: Dell MD3200 - sd: Current: sense key: Illegal
 Request ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
Date: Fri, 04 Mar 2011 12:34:07 -0500
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The lvols are EXT4, and I see that barrier is enabled by-default. I can 
try disabling, but need to investigate a bit.

Also, I believe I may have isolated the problem a bit. I can only cause 
this behavior when I access these volumes from an NFS client.

I think this might be put it out of scope of the dm code.


-Charles



On 3/3/11 23:34 , Moger, Babu wrote:
> I have looked at your logs.. Here are the messages..
>
> Mar  3 15:38:37 rman-ss-03 kernel: sd 1:0:0:0: Done: SUCCESS
> Mar  3 15:38:37 rman-ss-03 kernel:         2 sd 1:0:0:0:
> Mar  3 15:38:37 rman-ss-03 kernel:         command: Synchronize Cache(10): 35 00 00 00 00 00 00 00 00 00
> Mar  3 15:38:37 rman-ss-03 kernel: : Current: sense key: Illegal Request
> Mar  3 15:38:37 rman-ss-03 kernel:<<vendor>>  ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
> Mar  3 15:38:37 rman-ss-03 kernel:
> Mar  3 15:38:38 rman-ss-03 kernel: sd 1:0:0:0: Done: SUCCESS
> Mar  3 15:38:38 rman-ss-03 kernel:         2 sd 1:0:0:0:
> Mar  3 15:38:38 rman-ss-03 kernel:         command: Synchronize Cache(10): 35 00 00 00 00 00 00 00 00 00
> Mar  3 15:38:38 rman-ss-03 kernel: : Current: sense key: Illegal Request
> Mar  3 15:38:38 rman-ss-03 kernel:<<vendor>>  ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
>
> These messages are coming  because of Synchronize Cache commands.  It
> may be related to type of filesystem you are on. Did you have barrier
> enabled on your filesystem. I see that these commands are going out
> to target on passive paths.. I dont understand that part yet.
> Normally scsi device handlers block commands going out passive
> paths..This should be coming in a differrent path.. I still have to
> figure that out..
>