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Storage Area Network (SAN)
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A SAN is a data storage network that transfers data in blocks between storage devices and servers. This block-level file transfer facilitates mission critical data applications. Three connection schemes are used with SAN: Fibre Channel (FC), iSCSI, and ATA over Ethernet (AoE). Some setups utilize multiple
connection schemes to balance cost and performance. FC is an older high performance scheme that is technically unique. Fibre Channel can accommodate both
SCSI and ATA. Costs can be high if FC switches are used to attach storage arrays to a server. iSCSI lowers cost by utilizing gigabit Ethernet adapters and switches. The TCP/IP protocol is familiar to data system managers and blends well with wide area network (WAN) based disaster recovery plans. AoE is a
newer low cost technology that rides on ATA commands in lieu of TCP/IP. AoE can be mixed with iSCSI for flexibility.
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SAN Advantages:
- Excess capacity in SANs can be pooled, resulting in high utilization of resources.
- Block-level file transfer and storage for mission-critical applications.
- Multiple site data mirroring facilitates disaster recovery plans.
- Highly scalable.
- SAN costs per GB decrease as system grows.
- High performance and availability.
- Network loads are dynamically balanced.
- Can use DAS and NAS storage arrays.
- Ideal for imaging and databases.
SAN Disadvantages:
- Functionality is high, however Performance can typically fall below that of DAS.
- High startup cost (mainly due to software).
- System management complexity.
- Immature standards affect component compatibility.
- No simultaneous access to single storage volume.
Use ESA's storage and expansion arrays to build your SAN network. Configure them to meet your requirements.
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