[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: COMMAND SEQUENCE ERROR when reading from pipe or stdin

Mitch Davis wrote:


Hello,

I'm trying to use growisofs to write data to a
blanked DVD-RW.  If I point growisofs at an image
file, everything works properly.  But if I pipe in
the image file via stdin or a named pipe, the
write fails with the message "COMMAND SEQUENCE ERROR".

(Ultimately I want the data to be streamed from a
backup program, not from a file)

I'm running RedHat FC3 on a P4, with FC3's version of
dvd+rw-tools 5.21.4.10.8.  The kernel is stock FC3
2.6.9-1.667, with no relevant kernel cmd-line args.
There are no automount daemons running (I killed hald
and dbus-daemon-1 and removed the "managed" line from
/etc/fstab) and as far as I can tell, nothing else is
accessing the drive.  ps aux looks clean to me, and
lsof shows nothing that has /dev/hdc open.
Since you are running FC3, you could run the cdrecord which comes with the release. I haven't had any problems with it. YMMV. 


I have straced it in both cases and I don't see any
relevant difference between the two runs.  (strace
doesn't show what the ioctl return buffer data is).

Please see below for more information; I hope it's
sufficient.
Any ideas why I'm not able to pipe data into growisofs? 
Many thanks,

Mitch.

# Prepare the source file.

[root@homer /mnt/hdb2]# dd if=/dev/zero of=/tmp/zero-10M bs=10M count=1
1+0 records in
1+0 records out
[root@homer /mnt/hdb2]# ls -l /tmp/zero-10M
-rw-r--r--  1 root root 10485760 Feb 18 11:48 /tmp/zero-10M

# Blank the media

[root@homer /mnt/hdb2]# dvd+rw-format -blank /dev/hdc
* DVD±RW/-RAM format utility by <appro@fy.chalmers.se>, version 4.10.
* 4.7GB DVD-RW media in Sequential mode detected.
* blanking |

# Write file directly

[root@homer /mnt/hdb2]# growisofs -Z /dev/hdc=/tmp/zero-10M
Executing 'builtin_dd if=/tmp/zero-10M of=/dev/hdc obs=32k seek=0'
/dev/hdc: FEATURE 21h is not on, engaging DAO...
/dev/hdc: reserving 5120 block, warning for short DAO recording
/dev/hdc: "Current Write Speed" is 2.0x1385KBps.
  1605632/10485760 (15.3%) @0.0x, remaining 0:27
  1605632/10485760 (15.3%) @0.0x, remaining 0:49
  1605632/10485760 (15.3%) @0.0x, remaining 1:06
  1605632/10485760 (15.3%) @0.0x, remaining 1:28
  1605632/10485760 (15.3%) @0.0x, remaining 1:45
  1605632/10485760 (15.3%) @0.0x, remaining 2:01
  1605632/10485760 (15.3%) @0.0x, remaining 2:23
  1605632/10485760 (15.3%) @0.0x, remaining 2:40
  1605632/10485760 (15.3%) @0.0x, remaining 2:56
  1605632/10485760 (15.3%) @0.0x, remaining 3:19
  1605632/10485760 (15.3%) @0.0x, remaining 3:35
builtin_dd: 5120*2KB out @ average 0.2x1385KBps
/dev/hdc: flushing cache

# Blank the media

[root@homer /mnt/hdb2]# dvd+rw-format -blank /dev/hdc
* DVD±RW/-RAM format utility by <appro@fy.chalmers.se>, version 4.10.
* 4.7GB DVD-RW media in Sequential mode detected.
* blanking |

# Write file via stdin

[root@homer /mnt/hdb2]# cat /tmp/zero-10M | growisofs -Z /dev/hdc=/dev/fd/0
Executing 'builtin_dd if=/dev/fd/0 of=/dev/hdc obs=32k seek=0'
/dev/hdc: FEATURE 21h is not on, engaging DAO...
/dev/hdc: "Current Write Speed" is 2.0x1385KBps.
:-! "COMMAND SEQUENCE ERROR"@LBA=0h. Is media being read?
:-! the LUN appears to be stuck at 0h, retrying in 5 secs...
        0/4706074624 ( 0.0%) @0x, remaining ??:??
:-! "COMMAND SEQUENCE ERROR"@LBA=0h. Is media being read?
:-! the LUN appears to be stuck at 0h, retrying in 5 secs...
^C

# Blanking again

[root@homer /mnt/hdb2]# dvd+rw-format -blank /dev/hdc
* DVD±RW/-RAM format utility by <appro@fy.chalmers.se>, version 4.10.
* 4.7GB DVD-RW media in Sequential mode detected.
* blanking -

# Media info

[root@homer /mnt/hdb2]# dvd+rw-mediainfo /dev/hdc
INQUIRY:                [TEAC    ][DV-W50E         ][1.30]
GET [CURRENT] CONFIGURATION:
Mounted Media:         14h, DVD-RW Sequential
Media ID:              PRINCO
Current Write Speed:   2.0x1385=2770KB/s
Write Speed #0:        2.0x1385=2770KB/s
Write Speed #1:        1.0x1385=1385KB/s
Speed Descriptor#0:    00/2298495 R@1.0x1385=1385KB/s W@2.0x1385=2770KB/s
Speed Descriptor#1:    00/2298495 R@1.0x1385=1385KB/s W@1.0x1385=1385KB/s
READ DVD STRUCTURE[#0h]:
Media Book Type:       32h, DVD-RW book [revision 2]
Legacy lead-out at:    5120*2KB=10485760
READ DISC INFORMATION:
Disc status:           blank
Number of Sessions:    1
State of Last Session: empty
Number of Tracks:      1
READ TRACK INFORMATION[#1]:
Track State:           invisible incremental
Track Start Address:   0*2KB
Next Writable Address: 0*2KB
Free Blocks:           2297888*2KB
Track Size:            2297888*2KB
READ CAPACITY:          1*2048=2048
[root@homer /mnt/hdb2]#





--
bill davidsen <davidsen@tmr.com>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979
Reply to: