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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