Re: SCSI tape access on 2.6 kernels?

Chip Coldwell
2006-01-26T16:40:21Z

On Thu, 26 Jan 2006, Chip Coldwell wrote:
>
> then again with direct I/O
>
> RHEL4# time dd if=/dev/nst0 of=/dev/null bs=32k
> 31250+0 records in
> 31250+0 records out
>
> real 2m30.687s
> user 0m0.063s
> sys 0m0.677s
>
> So in this case, performance is no worse or better with direct I/O
> than without.

I tried it again with direct I/O and an even larger block size, but
the time is the same:

RHEL4# time dd if=/dev/nst0 of=/dev/null bs=64k
15625+0 records in
15625+0 records out

real 2m30.153s
user 0m0.025s
sys 0m0.452s

Chip

--
Charles M. "Chip" Coldwell
Senior Software Engineer
Red Hat, Inc