Chapter 5 Information Settings and Display
5.1 Performance > set cache-parameters
ETERNUS CLI User’s Guide
Copyright 2015 FUJITSU LIMITED
P2X0-1030-09ENZ0
620
set cache-parameters
This command sets up the cache control conditions, which are performance tuning parameters, for the
specified volume(s). For normal operations, the cache control conditions do not need to be changed.
■
Syntax
■
Parameter
set cache-parameters {-volume-number
volume_numbers
| -volume-name
volume_names
}
{-pool-number
pool_numbers
| -pool-name
pool_names
}
[-fp {enable|disable}] [-pl
pre_fetch
] [-mwc
multi_writeback_counter
]
[-psdc
pre_fetch_sequential_detect_count
] [-sddc
sequential_dirty_detect_count
]
[-ss
sequential_slope
] [-sds
sequential_dirty_slope
]
[-cache-limit {off|32.5mb|65mb|130mb|260mb|520mb|1040mb|2080mb}]
-volume-number
or
-volume-name
This parameter specifies the volume identifiers whose performance tuning parameters are to
be set up. One or more parameters can be specified at the same time. For details, refer to
"1.2.9 Volume Syntax" (page 22)
.
-pool-number
or
-pool-name
This parameter specifies the Thin Provisioning Pool for the performance tuning parameter. One
or more Thin Provisioning Pools can be specified. For details, refer to
.
-fp
Optional. This parameter specifies the Force Pre-fetch (FP) mode. If this parameter is omitted,
the mode is not changed.
enable
Force Pre-fetch mode is enabled.
disable
Force Pre-fetch mode is disabled.
-pl
Optional. This parameter specifies the Pre-fetch Limit value. If this parameter is omitted, the
value is not changed.
-mwc
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.
-psdc
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.
-sddc
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.
Summary of Contents for Eternus DX410 S2
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