Date: Sun, 5 Oct 1997 22:45:54 +0200 From: Philippe Regnauld <regnauld@deepo.prosa.dk> To: Chuck <crtb@capecod.net> Cc: freebsd-isp@freebsd.org, freebsd-scsi@freebsd.org Subject: Re: Tape Backup Message-ID: <19971005224554.62507@deepo.prosa.dk> In-Reply-To: <199710052037.QAA00299@daisy.capecod.net>; from Chuck on Sun, Oct 05, 1997 at 04:37:19PM -0400 References: <199710052037.QAA00299@daisy.capecod.net>
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[Cc:ed to freebsd-scsi]
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 ?
> 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 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.
--
-- Phil
-[ Philippe Regnauld / Systems Administrator / regnauld@deepo.prosa.dk ]-
-[ Location.: +55.4N +11.3E PGP Key: finger regnauld@hotel.prosa.dk ]-
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