Re: Question about 2 DVD devices

[Truong Thanh Quang]

Hi Thomas,

Thanks for your prompt reply!

"But meanwhile this has been fixed" means we can use /dev/sr normally now with Ubnuntu 22.04 (kernel 5.19)?

Do I need to specify "-scsi_dev_family sg" to xorriso command like this one?

    xorriso -scsi_dev_family sg -dev /dev/sr0 -map ./data /data

Thanks alot,

Quang.

On Fri, May 5, 2023 at 1:31 PM Thomas Schmitt <scdbackup@gmx.net> wrote:

Hi,

Truong Thanh Quang wrote:
> I have 2 DVD-RW drives, Ubuntu 22.04. I need to write 2 DVD-R discs
> simultaneously.
> Sometimes, it finishes with an SCSI error.
> I wonder if xorriso can burn 2 DVD-Rs at the same time?

Yes, this is possible and i do it from time to time. Between Linux kernel
2.6 and 5.6 or 5.7 there was a throughput problem which could be
circumvented by using /dev/sg instead of /dev/sr. See
  https://dev.lovelyhq.com/libburnia/web/wiki/ConcurrentLinuxSr
But meanwhile this has been fixed.

SCSI errors were not a symptom of that flaw. Normally they indicate
individual problems of the hardware.
If you show the particular error messages then i may be able to tell more.


Have a nice day :)

Thomas