Compaq HSG80 - StorageWorks RAID Array Controller Specifiche Scaricare il pdf (Pagina 58)

100

101

2–14

Controller and Host Concepts

Table 2–3 shows the cache policies resulting from full or partial failure of cache

module A’s ECB in a dual-redundant configuration. Note that when cache module A

is at least 50% charged, the ECB is still operable and charging. When it is less than

50% charged, the ECB is low but still charging. The consequences shown in this table

are opposite for a failure of cache module B’s ECB.

Cache

Board

Failure

Good Same as for DIMM failure. Data integrity: Controller A

recovers all of its write-back data

from the mirrored copy on

cache B.

Cache policy: Both controllers

support write-through caching

only. Controller B cannot execute

mirrored writes because cache

module A cannot mirror

controller B’s unwritten data.

Failover: No

Table 2–2. Cache Policies and Cache Module Status (Continued)

Cache Module Status Cache Policy

Cache A Cache B Unmirrored Cache Mirrored Cache

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 395 396

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