Set Cache-Parameters - Fujitsu ETERNUS DX80 S2 Cli User's Manual

Chapter 5 Information Settings and Display
5.1 Performance > set cache-parameters

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
set cache-parameters {-volume-number
{-pool-number
[-fp {enable|disable}] [-pl
pre_fetch_sequential_detect_count
[-psdc
sequential_slope
[-ss
[-cache-limit {off|32.5mb|65mb|130mb|260mb|520mb|1040mb|2080mb}]
■ Parameter
-volume-number
or
-volume-name
-pool-number
or
-pool-name
-fp
-pl
-mwc
-psdc
-sddc
pool_numbers | -pool-name
pre_fetch
] [-mwc
sequential_dirty_slope
] [-sds
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
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
Pool Syntax" (page 20).
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.
Optional. This parameter specifies the Pre-fetch Limit value. If this parameter is omitted, the
value is not changed.
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.
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.
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.
ETERNUS CLI User's Guide
Copyright 2015 FUJITSU LIMITED
volume_numbers
| -volume-name
pool_names }
multi_writeback_counter
sequential_dirty_detect_count
] [-sddc
]
22).
620
volume_names
}
]
]
"1.2.5 Thin Provisioning
P2X0-1030-09ENZ0