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Posted by root on 04/09/07 10:54
Joerg Schilling <js@cs.tu-berlin.de> wrote:
>
> This really looks strange, as if the drive does not like to
> write faster than 4x.
>
I know it is impolite to mention growisofs here, but that program
does write the disk at 16x. It starts at 4x and ends at 18x, or so,
with an average of 11x.
>>cdrecord: Success. get performance: scsi sendcmd: no error
>>CDB: AC 04 00 00 00 00 00 00 00 01 00 00
>>status: 0x2 (CHECK CONDITION)
>>Sense Bytes: 70 00 05 00 00 00 00 0E 00 00 00 00 24 00 00 00
>>Sense Key: 0x5 Illegal Request, Segment 0
>>Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
>>Sense flags: Blk 0 (not valid)
>>resid: 24
>>cmd finished after 0.005s timeout 200s
>
> This may be the cause for your problems.
>
> Are you able to repeat this test on a platform with a better SCSI
> implementation than Linux (e.g. MS-Win or Solaris)?
> The drive usually reports the byte offset that it does not like
> but Linux limuts the SCSI request sense data to 16 bytes while
> at least 18 bytes are neded in order to find out what the drive
> does not like.
Linux is all I have. If you point me to where linux sets a 16 byte
limit I will go in and change that, recompile the kernel, and
run the test again. I am running 2.6.20.
I any case, cdrecord seems to self-limit the write speed, I suppose
to be conservative. I have run 100 or so of the Verbatim 16x through
the drive with growisofs and have not had a single coaster.
>
> It may also be a Linux kernel bug: under some conditions, Linux
> seems to modify SCSI commands before sending them to an ATAPI drive.
> Your error message may also fit to this problem....
> I did see this mayself. I got a
>
> Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
>
> message from Linux and after rebooting the same HW with Solaris, it
> did not show any problem.
>
I responded to an offer from Sun for a free copy of Solaris several
months ago. Nothing ever came of that. It was only a matter of
curiosity since I want to support linux and would not consider
Solaris as a permanent option.
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