Set Extreme-Cache - Fujitsu Eternus DX100 S3 User Manual

Chapter 3 Configuration Settings and Display
3.2 Volume Management > set extreme-cache

set extreme-cache

This command enables or disables the Extreme Cache (EXC) function for the ETERNUS DX. When the EXC func-
tion is enabled, this command also sets the PFM (PCIe Flash Module) capacity that is used as cache. Enabling
the EXC function triggers the use of PFM as cache memory for read I/O. As a result, the read I/O performance
should improve. The EXC function is disabled by default. The EXC function is only available for an ETERNUS
DX500 S3/DX600 S3 in which a PFM can be installed.
• This command is not available for the ETERNUS DX100 S3/DX200 S3 or the ETERNUS DX200F.
• To enable or disable the EXC function for each volume, use the "set volume-exc" command.
■ Syntax
set extreme-cache [-mode {enable|disable}] [-capacity
[-initial-caching-threshold
[-caching-threshold {disable |
■ Parameter
-mode
-capacity
initial_caching_threshold
caching_threshold
Optional. This parameter specifies whether the EXC function is enabled for the ETERNUS DX. If
this parameter is omitted, the existing setting remains unchanged.
enable The EXC function is enabled for the ETERNUS DX.
disable The EXC function is disabled for the ETERNUS DX and the capacity that is used for
the EXC is set to 0GB. (The setting value before the EXC function is disabled is not
retained when the EXC function is enabled again.)
Optional. This parameter specifies the PFM capacity that is used as cache. If this parameter is
omitted, the existing setting remains unchanged.
An error occurs when this parameter is specified together with the "-mode disable" parameter
or when the EXC function is disabled for the ETERNUS DX and this parameter is specified with
the "-mode" parameter omitted.
This parameter allows a multiple of 100GB to be specified for the cache size. If a value that is
indivisible by 100GB is specified, an error occurs.
Example: "-capacity 500gb" can be specified. "-capacity 550gb" cannot be specified.
"0gb" can be specified.
Only "gb" can be specified for the capacity.
capacity PFM capacity
ETERNUS CLI User's Guide
Copyright 2014 FUJITSU LIMITED
capacity
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