Here's what we can expect. A DSS-4 DAT tape holds 22Gb with mild compression.
Broadband: 5x5x270Mb = 6.7Gb
Narrowband: 3x5x270Mb = 4.0Gb
Complete (with stacked): 8x5x1.2x270Mb=13Gb
Complete obj: 8x5x270Mb=11Gb
WR filters: 3x3x270Mb = 2.5Gb
To write multiple files onto a tar tape, set up a file like this. Note that the "n" is crucial if you are going to be putting more than one file on the tape.
cd /data2/sholmes/CTIO tar -cvf /dev/rmt/3cn Phoeobjctio cd /data0/sholmes/Peg/broadband tar -cvf /dev/rmt/3cn obj mt -f /dev/rmt/3 rew tar -tvf /dev/rmt/3n > /home/massey/survey/TAPES/UBA-1 tar -tvf /dev/rmt/3n > /home/massey/survey/TAPES/UBA-2 mt -f /dev/rmt/3 off