Fujitsu Eternus DX100 S3 User Manual page 670

Chapter 6 Information Settings and Display
6.1 Performance > set cache-parameters
-mwc
-psdc
-sddc
-ss
-sds
-cache-limit Optional. This parameter specifies the upper limit value for the cache memory capacity that
Optional. This parameter specifies the Multi Write Back Counter (MWC). Increasing the MWC
value improves sequential write performance. If this parameter is omitted, the value is not
changed. The applicable range of MWC values depends on the type of RAID group to which the
volume belongs. The allowed range of MWC values can be displayed by using the "show cache-
parameters" command.
multi_writeback_counter
Multi Write Back Counter (MWC)
Optional. This parameter specifies the number of times data access (Read I/O) is sequentially
performed (Prefetch Sequential Detect Count). If omitted, then this parameter is not changed.
pre_fetch_sequential_detect_count
Number of times data access (Read I/O) is sequentially performed
Optional. This parameter specifies the number of times data access (Write I/O) is sequentially
performed (Sequential Dirty Detect Count). If omitted, then this parameter is not changed.
sequential_dirty_detect_count
Number of times data access (Write I/O) is sequentially performed
Optional. This parameter specifies the parameter for determining data access (Read I/O)
sequentiality (Sequential Slope). If omitted, then this parameter is not changed.
sequential_slope
Parameter for determining data access (Read I/O) sequentiality
Optional. This parameter specifies the parameter for determining data access (Write I/O)
sequentiality (Sequential Dirty Slope). If omitted, then this parameter is not changed.
sequential_dirty_slope
Parameter for determining data access (Write I/O) sequentiality
can be used by a volume. If omitted, then this parameter is not changed. Thin Provisioning
Pools cannot be specified. If the Bind-in-Cache capacity is set in the ETERNUS DX, this
parameter cannot be used. Volumes that are not LUN Concatenation Volumes and that are the
following types can be specified:
• Standard
• SDV
• SDPV
• MVV
off No upper limit is set.
32.5mb Up to 32.5MB can be used.
65mb Up to 65MB can be used.
130mb Up to 130MB can be used.
260mb Up to 260MB can be used.
520mb Up to 520MB can be used.
1040mb Up to 1040MB can be used.
2080mb Up to 2080MB can be used (this cannot be set for the ETERNUS DX100 S3).
ETERNUS CLI User's Guide
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