Date: Thu, 27 Sep 2001 18:01:04 +0200 From: Mark Rowlands <mark.rowlands@minmail.net> To: Bill Moran <wmoran@iowna.com> Cc: Heinrich Rebehn <rebehn@comm.uni-bremen.de>, questions@FreeBSD.ORG Subject: Re: PLEASE HELP: Problem backing up multiple filesystems on tape Message-ID: <20010927160107.DFF7937B418@hub.freebsd.org> In-Reply-To: <3BB319A0.2240B95C@iowna.com> References: <3BB1AFE6.4040106@comm.uni-bremen.de> <20010927093217.7765B37B421@hub.freebsd.org> <3BB319A0.2240B95C@iowna.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thursday 27 September 2001 2:20 pm, Bill Moran wrote:
> Mark Rowlands wrote:
> > dump -0 -a -f /dev/nrsa0 /var
>
> <SNIP>
>
> > so it works here - minus that funny little "c" option :-
> > -c Change the defaults for use with a cartridge tape drive,
> > with a density of 8000 bpi, and a length of 1700 feet.
>
> I don't use the -c option myself, but you don't have to use the -d option?
> mt shows the DAT I use to be 61000bpi, which is not the default at all ;)
> Is there another way to change the default bpi without using the -d switch?
It is my understanding....given that I use a dlt drive with hardware
compression and a variable block-size that :-
-a ``auto-size''. Bypass all tape length considerations, and
enforce writing until an end-of-media indication is returned.
This fits best for most modern tape drives. Use of this option
is particularly recommended when appending to an existing tape,
or using a tape drive with hardware compression (where you can
never be sure about the compression ratio).
is appropriate for my situation
However, if you " know" the tape capacity :=
-B records
The number of 1 KB blocks per volume. This option overrides the
calculation of tape size based on length and density.
--
You know you're a little fat if you have stretch marks on your car.
-- Cyrus, Chicago Reader 1/22/82
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010927160107.DFF7937B418>