- Speed of the storage interface (1 Gb, 2 Gb Fibre Channel versus 20-40 MB SCSI)
- Speed of server adapters (PCI and PCI-X bus speed)
- The server's I/O rate and ability (processor speed, memory)
- Congestion or storage interface activity (other activity)
- Speed and configuration of the storage system (cache, RAID, disks, etc).
- The type of data and data access pattern (large, small, random, sequential)
- Type and speed of disk drives being used (RPM, latency, throughput)
Read Randy Kerns' answer to this question.
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