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> Does the splitting problem occur if you write to the tape with dd and
> then read it back?
> 
> e.g. something like
> 
> dd if=/dev/urandom of=/tmp/largefile bs=512k count=10000 mt -f /dev/nst0
> rewind dd if=/tmp/largefile of=/dev/nst0 bs=512k dd if=/tmp/largefile
> of=/dev/nst0 bs=512k mt -f /dev/nst0 rewind dd if=/dev/nst0 of=/dev/null
> bs=512k

gundabad ~ # dd if=/dev/urandom of=/tmp/largefile bs=512k count=10000
9999+1 records in <--- this is a bit strange
9999+1 records out
5242567182 bytes (5.2 GB) copied, 922.047 s, 5.7 MB/s

gundabad ~ # mt -f /dev/nst0 rewind

gundabad ~ # dd if=/tmp/largefile of=/dev/nst0 bs=512k
dd: writing `/dev/nst0': Invalid argument
9999+1 records in
9999+0 records out
5242355712 bytes (5.2 GB) copied, 42.9369 s, 122 MB/s

gundabad ~ # dd if=/tmp/largefile of=/dev/nst0 bs=512k
dd: writing `/dev/nst0': Invalid argument
9999+1 records in
9999+0 records out
5242355712 bytes (5.2 GB) copied, 39.66 s, 132 MB/s

gundabad ~ # mt -f /dev/nst0 rewind

gundabad ~ # dd if=/dev/nst0 of=/dev/null bs=512k
9999+0 records in
9999+0 records out
5242355712 bytes (5.2 GB) copied, 38.5814 s, 136 MB/s

So, except for the strangeness of the test file initially being created too
short (5242567182 bytes are 9999 blocks and a leftover of 211470 bytes,
could that be a urandom limitation?), the drive appears to work fine: The
5.2 GB written are read as a single 5.2 GB file (and not split, as btape
would do with a blocksize of 512 KB).

If you need any more tests, please let me know.

Best,
  Andreas


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