HP Surestore Disk Array 12h and FC60 - Manual (Page 253)

Managing Disk Array Capacity 253
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Figure 87 Cache Flush Threshold Example
Write Data
Write Data
Write Data
80%
80%
80%
Cache Flush Threshold set to 80%
Cache Flush Limit set to 100%
Write data exceeds flush threshold
Start data flushing
Write data below flush threshold
Stop data flushing
Initial cache settings