February 2002
Intermediate to advanced
222 pages
6h 45m
English
Content preview from Using SANs and NAS
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Chapter 4. SAN Backup and Recovery
Overview
A SAN typically consists of multiple servers, online storage (disk), and offline storage (tape or optical), all of which are connected to a Fibre Channel switch or hub—usually a switch. You can see all these SAN elements in Figure 4-1. Once the three servers in Figure 4-1 are connected to the SAN, each server in the SAN can be granted full read/write access to any disk or tape drive within the SAN. This allows for LAN-free, client-free, and server-free backups, each represented by a different-numbered arrow in Figure 4-1.
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Figure 4-1. LAN-free, client-free, and server-free backups
Tip
Pretty much anything said in this chapter about Fibre Channel-based SANs will soon be true about iSCSI-based SANs. To visualize how an iSCSI SAN fits into the pictures and explanations in this chapter, simply replace the Fibre Channel HBAs with iSCSI-capable NICs, and the Fibre Channel switches and hubs with Ethernet switches and hubs, and you’ve got yourself an iSCSI-based SAN that works essentially like the Fibre Channel-based SANs discussed in this chapter. The difficulty will be in getting the storage array, library, and software vendors to support it.
- LAN-free backups
LAN-free backups occur when several servers share a single tape library. Each server connected to the SAN can back up to tape drives it believes are locally attached. The data is transferred ...
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