I am using an LTO2 drive with a holding disk which is a BSD UFS2 (== FFSv2) filesystem on a normal Seagata ATA drive:
wd1 at atabus1 drive 1: <ST3400832A> wd1: quirks 2<FORCE_LBA48> wd1: drive supports 16-sector PIO transfers, LBA48 addressing wd1: 372 GB, 775221 cyl, 16 head, 63 sec, 512 bytes/sect x 781422768 sectors wd1: 32-bit data port wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100) wd1(piixide0:1:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA) Amanda reports a wide range of tape write speeds during actual backups and flushing, and I can't make sense of them - some of them seem too high by a factor of 8. Doing dd of a 8.5G file (2G ram, dumped several days ago, so could not possibly be in the cache) to /dev/null gets me 42.3 MB/s. The raw drive gets me 67.8 MB/s. This was all without another process writing dumps. So for LTO-2, regular drives seem just barely ok. For LTO-4 I wouldn't be so sure, as I think that needs 80 MB/s minimum.
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