Exercises

1

  Obtain a window on a computational node with the qsub -I command  (see section 4.3.1 for more information on qsub -I). Generate a 4GB GPFS file with mkrandfile and copy it to your HPSS ``hpssonly'' directory using pftp_client, multinode and setpwidth 4. What data transfer rate has been reported by PFTP?

2

Delete the GPFS file created in exercise 3.4.3, then copy its image from HPSS back onto GPFS using pftp_client, multinode and sepwidth 4. What data transfer rate has been reported by PFTP?

3

Repeat transfers to and from HPSS in order to observe fluctuations in transfer rates. What are they caused by?

4

Delete the HPSS copy of the file.

5

Exit the session on the computational node.