Help on Protecting Your Data


How to Back Up Your Data Files

  1. Run the AIPS DISKU
  2. Convert UV Blocks to GB
  3. Physically mount your DLT
  4. Software Mount your DLT
  5. Write Data Files to Tape
  6. Issue the DISMOUNT command
  7. Set the write protector switch



  1. Run the AIPS DISKU by typing:
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    restore 0
    task 'disku'
    indisk=2;sort='b';doall=1
    inp
    go


    Your output will look something like:

    User Images UV files Extensions Other Total
    # # blocks # blocks # blocks # blocks blocks
    999 74 4736 24 3929236 685 165510 1 5 4099487


    The above three lines say that userid=999 has:

    • 74 Image files taking up 4736 blocks
    • 24 UV data files taking up 3929236 blocks
    • 685 Extensions taking up 165510 blocks


  3. Convert UV blocks to GB as follows:
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    3,929,236 / 1,000,000 = 3.9 GB
    3.9 x 3 = 11.7 GB (expansion factor for FILETYPE='UV')

    In this case, a DLT (or DDS 4 DAT) must be used to accomodate your data.

  5. Physically mount your DLT in the RGLINUX4 tape drive.
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    • Remember to set density = 4.0 on the left hand panel of the drive
    • Make sure the compress light ison


  7. Software mount your DLT with the AIPS task MOUNT by typing:
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    restore 0
    intape=3
    inp mount
    mount


  9. Write data files to tape with the AIPS task FITTP by typing:
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    restore 0
    task 'fittp'
    doall=1;indisk=2;intype='uv';outtape=3;doeot=-1
    inp
    go


  11. Issue the DISMOUNT command within AIPS and remove your DLT from the drive.
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    restore 0
    intape=3
    inp mount
    mount


    • Don't forget to WAIT a few seconds before yanking it out


  13. Set the write protector switch.
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    • The orange indicator should be visible for write protection