Date: Fri, 13 Feb 1998 16:26:34 +0600 (NS) From: Ustimenko Semen <semen@iclub.nsu.ru> To: grog@lemis.com, freebsd-hackers@FreeBSD.ORG Subject: Re: Sony SDT-7000 Tape won't write 4Gig Message-ID: <Pine.BSF.3.96.980213162358.8500A-100000@iclub.nsu.ru>
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On Thu, 12 Feb 1998, Greg Lehey wrote: > On Wed, 11 February 1998 at 19:51:36 +0600, Ustimenko Semen wrote: > > Hello! > > > > I have got Sony SDT-1700 device, but i can't get it work:( As a wrote - it is SDT-7000 realy:) > > It should write 4 Gig on one > > DDS Cassete. But under 2.2.5-RELEASE write to /dev/rst0 fail > > on near 1 Gig. > > > > The seller tells it works fine under WinNT with 3d Service Pack. > > Is this the only way to make it work? > > No, that's a very bad way to make it work. NT tape support is almost > non-existent. > > You don't say how you determined that you got to the end of the tape. > Programs like dump have their own idea of how big the tape is, and > will stop at this point even if you haven't got to EOT. I don't know > dump, but it should be in the man page. If you're getting this with > tar, something's seriously wrong. I wrote simple program, that fwrite to stdout random seeds, and to stderr - number of written bytes. Then i redirect output of my program to /dev/rst0, and on near 900Kb, program failed to fwrite due to i/o error. After i/o error any operations on /dev/rst0 cause messages from kernel, that it can't write to device. Else: the Cassete was used more than on 3/4. I use DDS-2, it shall ( as noticed) write 4G without and 8G with compression. > > Don't believe the values given for compression, BTW. 2:1 compression > is about best case. You should get 80% or so more on tape with > compression. > > Greg > Sorry for bad English. Thank you To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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