Chapter 17

Reliability and Server Failover

We’re going back to a central theme of the book: tiering.

Tier 3 storage typically does not require server failover, and never requires replicated storage.
Tier 2 storage may or may not merits server failover; it typically does not merit replicated local storage. Improving on existing direct attached storage … server failover is typically not an option. If you need more insurance and need server failover for selected applications, this justifies moving from direct attached storage to external SAN storage.
Tier 1 storage typically requires server failover and sometimes requires replicated storage, either local replication or remote replication.

A key capability to providing workable failover ...

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