Some Storage Considerations
March 27, 2010
|
DAS |
NAS |
SAN |
iSCSI |
|
| Type of connection | • SCSI • FC-AL • …. |
• Fast Ethernet • Fibre Channel |
• Fibre Channel | • Internet |
| Remote connection | • Typically no | • Yes | • Possible | • Yes |
| Type of I/O | • Block | • File | • Block | • Block |
| Performance | • High | • Limited by the network | • Higher | • Limited by the network |
| Data sharing | • Implies NFS or CIFS | • Native | • Difficult | • Difficult |
| Cost reduction | • No | • Yes | • Yes | • Yes |
| Investment separation | • No | • Yes | • Yes | • Yes |
| Scalability | • No | • Yes | • Yes | • Depends on network |
| Centralization of management and support | • Typically no | • Yes | • Yes | • Yes |
| Management | • Traditional | • SNMP | • Difficult | • Difficult |
| LAN-Free Backup | • No | • Depends on NAS | • Yes | • Depends on iSCSI |
| Server-Free Backup | • No | • Depends on NAS | • Yes | • Depends on iSCSI |
| Security | • By the server | • By the server | • By the servers and storage network | • By the servers and network |
| Installation | • Specific to the server | • Simple | • Difficult | • Difficult |