Date: Mon, 13 Aug 2001 15:10:46 +0200 From: Bernd Walter <ticso@mail.cicely.de> To: Matthew Jacob <mjacob@feral.com> Cc: Bernd Walter <ticso@mail.cicely.de>, freebsd-hackers@FreeBSD.ORG Subject: Re: mtio questions Message-ID: <20010813151046.A11357@cicely20.cicely.de> In-Reply-To: <Pine.BSF.4.21.0108121753040.65085-100000@beppo>; from mjacob@feral.com on Sun, Aug 12, 2001 at 06:03:00PM -0700 References: <20010812140406.A7326@cicely20.cicely.de> <Pine.BSF.4.21.0108121753040.65085-100000@beppo>
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On Sun, Aug 12, 2001 at 06:03:00PM -0700, Matthew Jacob wrote:
>
> I'll answer based upon -stable FreeBSD code.
>
> On Sun, 12 Aug 2001, Bernd Walter wrote:
>
> >
> > Asume the following code examples:
> >
> > int fd;
> > struct mtop mo;
> > char buf[10240];
> >
> > fd = open("/dev/nsa0", O_RDWR | O_EXLOCK);
> > mo.mt_op = MTREW;
> > mo.mt_count = 0;
> > ioctl(fd, MTIOCTOP, &mo);
> > write(fd, buf, 10240);
> > close(fd);
>
> Let's not ask whether this is variable record or not.
Do you think it's a good idea to always set the blocksize to 10k?
Are there better choices than 10k?
Are there drives out there that can't work with this?
AFAIK it's supposed that drives/drivers have to split the 10k
block into smaller physical if the drive is not capable of writing
a single 10k block.
--
B.Walter COSMO-Project http://www.cosmo-project.de
ticso@cicely.de Usergroup info@cosmo-project.de
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