From: eric@tantalus.nrl.navy.mil (Eric Youngdale) Subject: Re: "SCSI host 0 timed out: Aborting command." ??? Date: Mon, 19 Apr 1993 21:06:12 GMT
In article <1993Apr19.041254.25509@uc.msc.edu> mfrankow@piper.hamline.edu (Mike Frankowski) writes:
>Vladimir Vukicevic (vladimir@intrepid.intrepid.com) wrote:
>: I have been getting these messages frequently lately. What do they mean?
>: How can they be fixed? I am using SLS, kernel 0.99p8 on a 486DX/50 with
>: an AHA-1542B SCSI controller and a ~500MB SCSI disk.
>
>: - Vladimir
>: - vladimir@intrepid.com
>
>I have a 1542c, and if the bios is turned on, I get the same error, with
>the bios shut off, it doesn't happen.
The Adaptec low-level driver has a no-op for the abort function. This
means that if a command times out, that the kernel essentially continues to
wait for it to complete and no attempt is made to kill the currently running
command. If you do not get messages about I/O errors, then this means that the
command completed normally and you have nothing to worry about.
It would concern me a little to get these messages, however, because
this indicates that once in a while the commands take much longer to complete
that would normally be expected, and this means that you may have data errors
somewhere on the disk (It will take the disk longer to read some particular
sector(s) because it needs to retry the operation or use ECC to clean up the
bad version of the sector).
-Eric
--
"When Grigor Samsa woke up one morning from unsettling dreams, he
found himself changed in his bed into a monstrous vermin."
-F. Kafka