HPSS Reconfiguration
Issues
- Define New COS (Class Of Service)
- Cache disk assignment was too small
- 8 GB for Simulation’s COS
- Total “pput” throughput Only ~13 MB/sec
- Due to performance limit of ONE hard disk drive
Disk Reconfiguration
- Five RAID Disk systems
- 3 SSA loops & 2 SCSI RAID
- Achieve > 50 MB/sec max. (pput only; No migration)
- 30 concurrent pftp/pput from Linux to HPSS
- Too many pftp sessions degrade migration performance (Disk to Tape I/O)