Date: Sun, 5 Oct 1997 22:00:58 -0400 (EDT) From: Chuck <crtb@capecod.net> To: crtb@capecod.net, regnauld@deepo.prosa.dk Cc: freebsd-isp@freebsd.org, freebsd-scsi@freebsd.org Subject: Re: Tape Backup Message-ID: <199710060200.WAA00761@daisy.capecod.net>
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Philippe writes: >Chuck writes: >> > Khanh Nguyen writes: >> > > Does FBSD-2.2.2-REL support Hewlett Packard Colorado T3000 tape >> > > backup devices? If so, has anyone configured the kernel to use this? And >> > > if yes, can you send me the copy of the kernel config? >> >> > We're talking about the Travan SCSI HP/Colorado, right ? >> > There was some talk about this drive some time ago, and IIRC, >> > it has a problem with tape locking or something like it (i.e.: >> > the Travan doesn't support it, and any operations to access the >> > drive fail miserably). Last time I checked the archives, no >> > no patch is available. Maybe check the Linux code (don't know >> > if they support it). >> >> Alas, as I found out, non-SCSI tapes of all stripes remain unsupported >> under FreeBSD-2.2.2 :-( So I forked over 3 bills and bought a TR-4, >> installed it as /dev/st0, and bingo, it goes like a champ, around >> 500KB/second! > > I thought the T3000 was scsi (travan). > What tape format does the TR-4 use ? 2 quesions; My TR-3 machine is an Exabyte Eagle, straight ISA, with its own board. Very nice if you run Micxxxxft OS, but unsupported in FreeBSD. There may also be a SCSI version. The TR-4 is apparently different. The cartridges look identical, but the TR-3 says 1.6GB, while the TR-4 says 4GB. Plastic, with an aluminum plate on one side. The format is evidently multiple passes end to end, with the head moving a tiny bit between passes, just like the old tapes. >> Alas, over an ethernet from another FreeBSD 2.2.2 system using dump, >> it hiccuped continuously, getting just about 50KB/second. >> Is there any fix for that, like perhaps a humongous buffer? I figured, >> since the average data rate was 50KB/sec., and the hiccups averaged >> 4 seconds, I was buffering about 200KB. Can I buffer say, 10MB? I'd still like to know if this is possible. > I expereienced the same problem with an old DAT drive and > remote dump -- 50K/sec where I usualy get 200. This with a 2.2.1 > laptop dumping to a -current machine. > >-- > >-[ Philippe Regnauld / Systems Administrator / regnauld@deepo.prosa.dk ]- >-[ Location.: +55.4N +11.3E PGP Key: finger regnauld@hotel.prosa.dk ]- Chuck Bacon - crtb@capecod.net
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