Copying your data from Exabyte tape to disk

 

In this section I describe how to copy your RPFITS files from tape to a Unix file system outside of AIPS. The output file is thus still an RPFITS file.

1. First set your working directory to the appropriate data area (see § 2.3) with a command such as

   cd /DATA/PUPPIS_3/other/ehubble

2. You can now copy your RPFITS files from Exabyte to RPFITS files on the disk in this area. Use the Unix command ansiread for this purpose. You can do man ansiread to learn all about it. Here is an example of how to read the second and third RPFITS files from your Exabyte tape.

   ansiread -f /dev/nrst0 -s 1 -r 2

   where /dev/nrst0 is the tape device name (it is written on the Exabyte tape drive cabinet), the -s 1 directs it to skip one file and the -r 2 directs it to read two files. The file will be created on disk with the name given to it by the on-line observing computers. You can then read it into AIPS (or MIRIAD) from here as described in § 4.3 if you wish.

3. Once you are finished, eject the tape by pushing the button on the tape drive cabinet, or by issuing the Unix command

   mt -f /dev/nrst0 offline