Fujitsu Eternus DX100 S3 User Manual page 171

Chapter 3 Configuration Settings and Display
3.2 Volume Management > set extreme-cache
-initial-caching-threshold
-caching-threshold
■ Example(s)
The following example enables the EXC function for the ETERNUS DX and sets the cache capacity to 1000GB:
CLI> set extreme-cache -mode enable -capacity 1000gb
Optional. This parameter, when used for the first time, specifies the number of times data is
discarded from DRAM until the data is staged in the PFM. This value is applied until all areas in
the PFM are used after the ETERNUS DX is powered ON or after the Extreme Cache function is
enabled. Staging data becomes more efficient during a Random Read when this value is
smaller. The settable range is 1 to 16. The default value is "1". If this parameter is omitted, the
existing setting remains unchanged.
• Setting a value smaller than the Caching Threshold is recommended.
• If the Extreme Cache function is disabled, this parameter cannot be specified.
initial_caching_threshold
Initial caching threshold (1 - 16)
Optional. This parameter specifies the number of times data is discarded from DRAM until the
data is staged in the PFM. This value is applied when all areas in the PFM are used after the
device is powered ON or after the Extreme Cache function is enabled. Changing data in the
PFM becomes more efficient when this value is smaller. Rewriting data in the PFM becomes
less frequent when this value is larger. The settable range is 1 to 16. The default value is "5". If
this parameter is omitted, the existing setting remains unchanged.
• Setting a value larger than the Initial Caching Threshold is recommended.
• If the Extreme Cache function is disabled, this parameter cannot be specified.
Disable Data disposal is prohibited. The cached data in the PFM cannot be rewritten.
caching_threshold
Caching threshold (1 - 16)
ETERNUS CLI User's Guide
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