tape backup size

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# 1  
Old 02-20-2008
tape backup size

How can I tell how much tape is left (or how much tape has been used) after doing a backup? My system is on Solaris 5.8.
# 2  
Old 02-22-2008
Only way to even estimate is to compare the size of backup to the published specs of the tape. So if you put 1 GB of data on a DAT rated at 4 GB, you probably have about 75% of the tape left. Don't bet the rent on being able to store exactly 3 more GB though.
# 3  
Old 02-22-2008
Another consideration is compression. Some drives do it through hardware; so 1gb on the disk might only be 250/300mb on the tape.
Also as the tape gets older and used more, bad stops develop and those are skipped, consequently reducing the capacity of the tape.
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