Solved !!!!
This was a faulty drive (Although the vendor took some convincing)
Installed the new drive and legato is now writing to the full capacity of the tape.
The key to working this out was the drive's internal tape verify utility (drive diags on this 3581) the tape failed the test on the...
We have Both IBM LTO 1 and 2 drives they are connected to different Sun Servers.
The LTO 2 is fine and runs prefectly the LTO 1 however follows the pattern above I/O errors and marking a tape full after having only a few hundred kb written to them.
Both Sun servers were running the latest...
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