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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.



Zdzislaw Meglicki
2004-04-29