Date: Wed, 24 Mar 1999 16:42:11 +1030 From: Ian Moore <imoore@hamcoll.schools.sa.edu.au> To: Greg Lehey <grog@lemis.com>, Mailing List Free BSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: Using dump with a DAT Message-ID: <36F8823B.B2C3266A@hamcoll.schools.sa.edu.au> References: <36F81CD5.C5E6AB25@hamcoll.schools.sa.edu.au> <19990324150415.W425@lemis.com>
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Greg Lehey wrote: > > On Wednesday, 24 March 1999 at 9:29:33 +1030, Ian Moore wrote: > > Hi, > > I'm trying to dump to a Seagate CTD4004R-S 4/8Gig DAT drive on a server > > running 2.2 STABLE & am having problems when the end of the tape is > > reached. Using -u does not work. > > Do you really mean -u? <snip> Sorry! no, what I meant to write was -a. > > I found this in the mailing list archive: > > > >> On Wed, 25 February 1998 at 16:01:21 -0600, Jason Hudgins wrote: > >>>>> I have a Seagate DAT that I've been dumping backups too. The DAT is > >>>>> supposed to have a 4 gig capacity (uncompressed) when writing to a 120m > >>>>> tape. Can anyone PLEASE tell me the proper density/tape length to get > >>>>> 4 gigs out of this thing? So far I've been using a density of 61000 and a > >>>>> length of 6000, which will store about 2 gigs..and works fine, but I > >>>>> REALLY need to get 4 gigs out of it...or at least 3. > >>>> > >>>> Try using the -a option and drop the length and density options. If your drive > >>>> reports EOM properly it should work just fine. > >>> > >>> I've tried that.. it doesn't work.. it just hits the end of the tape and > >>> the bugs out with write errors.. =( > >> > >> Unfortunately, the tape driver currently returns an I/O error > >> indication when it hits end of tape. They're working on it, but it's > >> more complicated than it appears. > >> > >> Greg > > > > I'm wondering if this problem has been solved yet?! > > Hmm. It would have helped if you had included the date and the name > of the sender in your quote, Here is the header: Date: Thu, 26 Feb 1998 09:43:28 +1030 From: Greg Lehey <grog@lemis.com> To: Jason Hudgins <jason@www.dancooks.com>, Rob Nelson <rob@mag-net.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: using dump with a DAT Message-ID: <<a href="mid.cgi?db=irt&id=19980226094328.48933@freebi > but it appears to have been from me on > Thu, 26 Feb 1998 09:43:28 +1030. Yes, I'm pretty sure the software > has changed completely since then. But ISTR that dump doesn't take > kindly to end of tape. > > > If not, can anyone tell me what values I should use for a 4G DAT tape > > (120 metres) if I don't use compression -I've tried some of the > > suggestions given on the mailing list archives, but keep getting > > 'invalid 'd' (density) value' or 'invalid 'b' (no of blocks per write) > > value' errors. > > There seem to be numerous opinions on what values to use & wether to use > > d & s or b & B parameters & I'm kinda confused. > > If you're going to get involved in this kind of guesswork, then -b and > -B are the way to go, but you'll waste a lot of space if you turn > compression off, and I'd still go for -a. What error messages are you > getting? > When the dump reaches the end of the tape, I get the following: DUMP: write error 2310680 blocks into volume 1 DUMP: fopen on /dev/tty fails: Device not configured DUMP: The ENTIRE dump is aborted. -- Ian Moore Network Administrator Hamilton Secondary College To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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