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OK, So I think I have answered my own query.
MY original build was on 2.5.2p1-1, and my build had a fixed blocksize such that changing that parameter made no difference to amtapetype. However I now...

OK so I think I may be getting to the root of this.
I have run some tests using "dd if=/RAID/randombytefile of=/dev/nst0 bs=NNNk" with varying values of NNN (the blocksize)
NNN Throughput
32k ...

Some time ago I built an Amanda 2.5.x system on SuSE 10.3 (using the repo version) with an IBM Ultra 160 scsi LTO3 and was getting amtapetype figures of around 65000 kp/s.

I recently built a...