Hi All,
I would like to report the success writing to 6 Matshita CW7502 on a
Linux
system (firmware updated to 1.17) at the same time. I've created a shell
script
to do that and allocated 2MB of buffer to each cdrecord process and all
the recording works fine.
With that configuration, I was be able to burn 32 Debian GNU/Linux
CD images at only 2 hours :-)
When I tried to add a Matshita CW7503 to the set I got "errors flushing
the cache"
(Now I'm sure that sg of Linux is very poor, about it's max transfer
rate).
The next thing that I will try do is got some lent recorders to do tests
on the FreeBSD and try to reach better performance results (and probably
with more
recorders at the same time) :-)
[]s
Some Notes:
- Cdrecord 1.9 (the development 1.10a18 also workeds fine).
- SCSI Cards: Adaptec AIC 7850, 19160, NCR 53c8xx (the above test was
made on the 19160 card with all recorders in the same bus).
- The max SCSI support in the Linux kernel 2.2 appear to be limited
to 3.600 KB/s and if occur a SCSI reset or command sequence error in
that kernel,
all writting process in the same bus is losed!
- The kernel 2.4 had a better sg driver, the transfer rate increased to
4.700/4.800
Kb/s but isn't that I was hopping... the SCSI card was a Adaptec AIC
19160
and the sg transfer rate was a lot down of the allowed by the card.
---------------------------
Gleydson Mazioli da Silva
[EMAIL PROTECTED]
[EMAIL PROTECTED]
"640K ser�o suficientes para todo mundo"
-- Bill Gates circa 1981
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