Date: Fri, 10 Nov 2006 09:11:27 +0100 From: Ralf Folkerts <ralf.folkerts@gmx.de> To: freebsd-stable@freebsd.org Subject: Remote Tape slow.... Message-ID: <4554342F.7040309@gmx.de>
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Hi, I recently replaced an old DDS-II Tape with a not so old AIT-Tape in one of my FBSD-Boxes. However, access via RMT is really slow :-( When I perform a local dump of the machines that hosts the drive I get 4 - 6MB/s throughput. I get roughly the same speed, when I move the Tape to one of the other machines and perform a local dump. However, when I set "RSH=/usr/bin/ssh" and then dump to user@tape-machine:/dev/sa0 (I didn't change any of the other dump-Parameters like Blocksize etc.) I get a speed of ~1MB/s. I tried this both with good old 3Com 3C905TX(100MBit) and DLink DGE-530T (1GBit). The Drive is atached to an Adaptec 2940UW, the "normal" Machine that Hosts that Drive is a PIII/733MHz Box with 512MB RAM. During the dump none of the machines really show up with Load; they are ~0.15/0.20. Is this the expected behaviour of RMT? I thought I could expect (nearly) the speed of a locally atached Drive. Or is there something to tune so I get better throughput? I already searched the Lists, Manual and G* but ddin't find a real hint :-( Would be great if I could speed this up... MTIA! Cheers, _ralf_
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