Let's say I want to back up all my UV data files on disk 2 of
RGLINUX4. My steps are as follows:
- Run the AIPS task DISKU
by typing the following
lines:
restore 0
task 'disku'
indisk=2; sort='b'; doall=1
inp
go
Note: Restore 0 resets all inputs to their default values. You
then need only set a few crucial inputs (the ones given here) and not worry if
the others are correct or not.
Wait till the task has completed and at the bottom of your screen output, you
will see some summarized information similar to the following:
| 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 I (userid=999) have:
74 Image files taking up 4736 blocks
24 UV data files taking up 3929236 blocks
685 Extensions taking up 165510 blocks
- Convert blocks to GB
as follows:
3,929,236 / 1,000,000 = 3.9 GB
3.9 x 3 = 11.7 GB (because FILETYPE='UV')
The
DATs, EXABYTEs, and DLTs page says
that only a DLT (or DDS 4 DAT) will be large enough to accommodate
all 24 files. At this point ask yourself if it is really necessary to keep
all 24 files. If not, delete the unnecessary ones and rerun DISKU.
My advice is to:
Always use the smallest backup medium that will accommodate your
data.
Clean up your disk. Delete unnecessary files (intermediate and test
files) before backing up.
Note: I have not included the Extension files (e.g.,
CLs, CCs). Some belong to the UV data files and
some to the image files. They are small and for rough size estimates do not
need to be included.
- Physically mount your DLT
in the RGLINUX4 tape drive.
Remember to set density=40.0 on the left hand panel of the drive and
make sure the compress light is off.
- Software mount your DLT
with the AIPS task
MOUNT by typing:
restore 0
intape=3
inp mount
mount
- Write data files to tape
with the AIPS task FITTP by
typing:
restore 0
task 'fittp'
doall=1; indisk=2; intype='uv'; outtape=3; doeot=-1
inp
go
- Issue the DISMOUNT command
within AIPS and
remove your DLT from the drive. Don't forget to wait a few
seconds before yanking it out.
- Set the write protector switch
, i.e., the orange indicator should be
visible.