For Direct Attached Storage (DAS) with multiple controllers
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SCSI-320
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SAS (Serial Attached SCSI)
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SCSI-640
Storage Area Networks (SAN) with multiple HBAs (host bus adapters), directors/channels, & redundant pathways
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Fibre Channel 1GFC
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iSCSI via 1Gb Ethernet
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Fibre Channel 2GFC
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Fibre Channel 4GFC
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iSCSI via 10Gb Ethernet
The entire universe of I/O subsystem choices are shown in the table on the following page with all the above stated good choices highlighted.
| Interface | Throughput |
| PATA PIO Mode 0 | 3 |
| SCSI-1 | 5 |
| PATA PIO Mode 1 | 5.2 |
| PATA PIO Mode 2 | 8.3 |
| Fast SCSI 2 | 10 |
| PATA PIO Mode 3 | 11.1 |
| iSCSI / 100Mb Ethernet | 12.5 |
| PATA PIO Mode 4 | 16.7 |
| Fast-Wide SCSI 2 | 20 |
| Ultra SCSI | 20 |
| Ultra DMA PATA 33 | 33 |
| Ultra Wide SCSI | 40 |
| Ultra2 SCSI | 40 |
| USB 2.0 | 60 |
| Ultra2 Wide SCSI | 80 |
| Ultra DMA PATA 66 | 66 |
| Ultra DMA PATA 100 | 100 |
| Fibre Channel 1GFC | 106.26 |
| iSCSI / 1Gb Ethernet | 125 |
| Ultra DMA PATA 133 | 133 |
| SATA 150 | 150 |
| Ultra3 SCSI-160 | 160 |
| Fibre Channel 2GFC | 212.5 |
| SATA 300 | 300 |
| eSATA | 300 |
| Ultra-320 SCSI | 320 |
| SAS 1 | 375 |
| Fibre Channel 4GFC | 425 |
| SATA 600 (not yet) | 600 |
| Ultra-640 SCSI | 640 |
| SAS 2 (not yet) | 750 |
| Fibre Channel 8GFC | 850 |
| iSCSI / 10Gb Ethernet | 1250 |