On Mon, Jul 16 2007, Kai Makisara wrote:
> On Mon, 16 Jul 2007, Martin K. Petersen wrote:
>
> > >>>>> "John" == John Stoffel <[email protected]> writes:
> >
> > John> Will this help out tape drive performance at all? I looked
> > John> through the patches quickly, esp the AIC7xxx stuff since that's
> > John> what I use, but nothing jumped out at me...
> >
> > Yes. Most modern tape drives want a block size of 1MB or higher.
> > With the old stack we'd be stuck at 512KB because the sg limitations
> > caused us to come just short of 1MB...
> >
> Tape block sizes up to 16 MB have been possible for a very long time but
> this has required tuning of the block/scsi parameters. Very few people
> seem to have done this and the common (mis)belief seems to be that the
> tape block size limit has been 512 kB. It is good if this tuning is not
> needed in future.
The main difference is now you get to do it without hacks and in a clean
way, so it works through the normal IO path and not some on-the-side
thing (or st only).
--
Jens Axboe
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