Hi there.
Last weekend we upgraded our DLT4700 (single DLT4000, 7 slots) for a Brece-Hill Q2.15 (two DLT 7000, 15 slots). We're reusing the CompacTape IV cartridges, but the new drives seem to recognise the old tapes as being written by a DLT4000, and don't use the higher density that the DLT7000 is capable of.
Is there an easy way to re-initialise the tapes that'll allow us to use the maximum storage capacity?
Details follow:
First we check the status of the drive:
Checking pre-dump status with: rsh -n <filer> mt -f nrst0a status Tape drive: Digital DLT7000 Status: ready, write enabled Format: 85937 bpi 70 GB (w/comp) fileno = 0 blockno = 0 resid = 0
This implies that it'll use the high density we're after...
Then we do the dump
rsh -n <filer> dump 0ufbB urst0a,urst0a,urst0a,nrst0a 63 30000000 /
(Yes, I know the block count is low - we're trying to fix the problems without causing any EOT fun & games)
Now after the dump is done, we load the tape into the drive, which reports
A: Idle C 20.00G
This says to me that the tape is still recorded at the DLT4000 density, albeit with compression.
Any suggestions?
Cheers, Mike