Tape migration for 1119 DLT and sDLT data tapes
ABANDON BACKUP TAPES ON OLD FORMATS.

Some new calculations, based on revised capacity claims for sDLT drives.

DLT-III can be read (nominally) on DLT2000XT/DLT4000/7000 drives
DLT-IIIXT can be read (nominally) on DLT2000XT drives
DLT-IIIXT and DLT-IV tapes can be read (nominally) on DLT4000/7000/8000
DLT-IV and sDLT-1 tapes can be read (nominally) on sDLT220/320
sDLT-1 tapes can be read (nominally) on sDLT600 and DLT-S4 drives

We have a HP StorageWorks MSL5000 (sDLT?) library in storage.

OR
HP 302511-222 SW MSL5026SL Tape  (2 driver for $15K)  
  OR  $2K for a DLT220 (1 drive)
      $5.5K (2 drive)
Superloader for $1K or $2.5K w sDLT320 drive

Not great success finding robot with DLT7000 or DLT8000 drive

Assume library works (big assumption)
Repurpose existing computer and LTO5 drive for facility
Need storage:  O(3xLTO5 capacity) = 5TB.
About 130 LTO5 tapes

Total days for sDLT, 24/7 = 52
Total days for DLT,  24/7 = 82  This is DLT-III, DLT-IIIXT, and DLT-IV

If we can keep both drives in the sDLT-robot running almost 24/5 we can
migrate in about 73 days for the sDLT times a fudge factor for exams, 
holidays, and failures.  Nominally 10 weeks before fudges, and about 3 LTO5
tapes per week.
The DLT drives would take 16 weeks, with the same fudge factors except
a higher failure rate, and it would run less than 1 LTO5 tape per week.

This suggests that the LTO5 tapes can be safely changed by hand on a daily
basis, but that daily library loading and unloading will be needed.

If we run two robots at the same time we could finish inside of 6 months (with
a 50% fudge factor).

Student hourly work involved:
 Record tape labels (may require peeling!) and unload/reload the robot
 Record failures, retry
 Unload/load LTO5
 File tapes
 Run the read-back and checksum comparison for random files.  (I assume
we checksum each file before writing it to tape).

Possible issues:
  The file size on the DLT tapes may not be ideal for LTO5.  We may 
need to untar them and re-tar them in new file sizes.  If we do that we
need more space, and we should probably checksum the individual files as
well.