Nick Holloway wrote:
> There are a few things that I've done help this.
>
> The first is to limit the data rate to 2000 (in /etc/conf.modules).
> Otherwise, ftape starts at the 4000Mb/s the accellerator can support,
> errors are reported and it backs off. Sometimes it only went down
> to 3000, but errors were reported, and the fifo threshold had to be
> increased. So, I stick to 2000Mb/s.
>
> alias char-major-27 zftape
> options ftape ft_fdc_driver=ftape-internal,none,none,none # ft_tracings=4
> options ftape-internal ft_fdc_base=0x370 ft_fdc_irq=6 ft_fdc_dma=3
> ft_fdc_rate_limit=2000
> pre-install ftape-internal /sbin/swapout 16
>
> Secondly, I found that enabling multi-sector transfer and interrupt
> unmasking for my IDE disk stopped the number of times the tape was
> repositioned during a backup. The usual warnings about using interrupt
> unmasking apply -- see hdparm manual page.
>
> hdparm -u 1 -m 16 /dev/hda
> hdparm -u 1 -m 16 /dev/hdb
>
> Finally, I leave the machine otherwise idle when it is performing
> the backup.
These are /GREAT/ tips. I will add them to the Ditto Max info section
on the Tape Certification site.
>
> As I remember it, the data rate reported by dump is ~160K/s.
This is as I would expect if you are successful.
--
Tim Jones [EMAIL PROTECTED]
Vice President Visit our tape backup web pages:
Enhanced Software Technologies, Inc. http://www.estinc.com/
