Fujitsu Eternus DX80 S2 - Set Raid-Tuning

Chapter 5 Information Settings and Display
5.1 Performance > set raid-tuning
ETERNUS CLI User’s Guide
Copyright 2015 FUJITSU LIMITED P2X0-1030-09ENZ0
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set raid-tuning
This command the performance tuning parameters for the specified RAID group. For normal operations, the
performance tuning parameters do not need to be changed.
■ Syntax
■ Parameter
set raid-tuning {-rg-number rg_numbers | -rg-name rg_names }
[-dcmf {1|2|3|4|5|6|7|8|9|10}] [-rebuild-priority {low|middle|high}] [-disk-tuning {enable|disable}]
[-throttle {10|20|30|40|50|60|70|80|90|100}] [-ordered-cut {0-65535}]
-rg-number
or
-rg-name
This parameter specifies the RAID group identifiers whose tuning parameters are to be set up.
One or more parameters can be specified at the same time. For details, refer to "1.2.8 RAID
Group Syntax" (page 22).
-dcmf Optional. This parameter specifies the value of Disk Command Multiplying Factor (DCMF).
DCMF is a coefficient that increases the limit on the number of outstanding disk commands.
Increasing the value of DCMF improves sequential write performance. The default value is one.
A DCMF value of two results in the limit on the number of outstanding commands by a factor of
two from the default.
-rebuild-priority
Optional. This parameter specifies the priority for Rebuild of the relevant RAID group. The same
priority is set to all of the RAID groups that are specified with the "-rg-number" parameter or
the "-rg-name" parameter.
low Low. Normal priority is given for rebuild, copyback, and redundant copy.
middle Middle. Rebuild, copyback, and redundant copy are given the same priority as
host access.
high High. Rebuild, copyback, and redundant copy are given priority over host access.
-disk-tuning
Optional. The default setting is "disabled". This parameter specifies whether to enable or
disable the tuning settings for disk accesses. If omitted, the existing setting is not changed.
When "disable" is specified, the "-throttle" and "-ordered-cut" parameters cannot be specified.
If omitted, the existing setting is not changed.
enable The tuning settings are enabled.
disable The tuning settings are disabled. (default)
-throttle Optional. This parameter specifies the ratio of command issues to disks as a percentage value.
This parameter can be specified only when "enable" is specified or is already set for the "-disk-
tuning" parameter. Between 10 and 100 (in increments of 10) can be specified. If omitted, the
existing setting is not changed.