Compaq HSG80 - StorageWorks RAID Array Controller Specifikace stáhnout pdf (Strana 56)

100

101

2–12

Controller and Host Concepts

Table 2–2 shows the cache policies resulting from a full or partial failure of cache

module A in a dual-redundant controller configuration. The consequences shown in

this table are the same for cache module B.

Table 2–2. Cache Policies and Cache Module Status

Cache Module Status Cache Policy

Cache A Cache B Unmirrored Cache Mirrored Cache

Good Good Data loss: No

Cache policy: Both controllers support

write-back caching.

Failover: No

Data loss: No

Cache policy: Both controllers

support write-back caching.

Failover: No

Multibit

cache

memory

failure

Good Data loss: Yes. Forced error and loss of

write-back data for which multibit

error occurred. Controller A detects

and reports the lost blocks.

Cache policy: Both controllers support

write-back caching.

Failover: No

Data loss: No. Controller A

recovers its lost write-back data

from the mirrored copy on

cache B.

Cache policy: Both controllers

support write-back caching.

Failover: No

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