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.

pgpI7gme2iu7d.pgp
Description: PGP signature