Mode
Category
Description
Default
MCU/RCU
896
Dynamic
Provisioning
Dynamic
Tiering
Thin Image
This SOM enables or disables the background format
function performed on an unformatted area of a
DP/DT/TI pool.
For information regarding operating conditions, see
the
Provisioning Guide
for your storage system.
Mode 896 = ON:
The background format function is
disabled.
Mode 896 = OFF (default):
The background format
function is enabled.
Notes:
1.
This SOM is applied when a customer requires
the background format for a DP/DT/TI pool in
the environment where new page allocation (in
the case that system
files
are created from a
host for newly created multiple DP-VOLs, for
example) frequently occurs and the write
performance degrades because of an increase
in write pending rate.
2.
When the background format function is
enabled, because up to 42 MB/s of ECCG
performance is used, local copy performance
may degrade by about 10%. Therefore,
confirm
whether the 10% performance degradation is
acceptable or not before enabling the function.
3.
When a Dynamic Provisioning VOL on an
external storage system, which is used as an
external VOL, is used as a pool VOL, if the
external pool on the external storage side
becomes full due to the background format, the
external VOL may be blocked.
If the external pool capacity is smaller than the
external VOL capacity (Dynamic Provisioning
VOL of external storage system), do not enable
the background format function.
4.
If the background format function is disabled by
changing this SOM setting, the format progress
is initialized and the entire area becomes
unformatted.
5.
The background format for FMC drives is not
disabled. When FMC drives are used, use SOM
1093.
OFF
-
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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Summary of Contents for Virtual Storage Platform F400
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