Subject: Re: dump incredibly slow with DAT
To: None <email@example.com>
From: Bernd Sieker <firstname.lastname@example.org>
Date: 02/22/2001 18:02:14
On 22.02.01, 17:49:39, email@example.com wrote:
> i've done first try to use dump - with my 10MB filesystem (/stand) with
> 6MB used.
> dump -0 -B 2000000 -u /stand
> does it in over 2 minutes while tar in less than 20 seconds (tar -b64 -cvf
> adding -b 32 or 64 to dump does not change the speed
Try dumping to stdout, and pipe the result through "buffer" (which is
in pkgsrc) to increase throughput. It does wonders when backing up
over a network connection, but might also help for local tape dumps.
dump -0 -B 2000000 -u -f - /stand | buffer >/dev/nrst0
Buffer has some options to tune the size of the shared memory segment
and some other parameters, but often the defaults work just fine.
NetBSD: Got source?