Chapter 6 Thin Provisioning Pool Management
6.9 Modify Cache Parameters (Thin Provisioning Pool)
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED
P2X0-1270-13ENZ0
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6.9
Modify Cache Parameters (Thin Provisioning Pool)
This function changes the cache parameters of each Thin Provisioning Pool (TPP). Performance of the storage
system varies depending on the cache hit rate. The ETERNUS DX detects sequentiality when a host requests
Read/Write. If sequentiality is detected when a Read request is issued, the cache hit rate is improved by
reading the sequential data into the cache memory in advance. The characteristics of Read/Write requests
from the host depends on the system. Performance of the storage system may improve by specifying a cache
parameter that is suitable for the system that is being used.
The following parameter can be specified:
•
Multi Writeback Count (MWC)
Specify the number of processes that can be written back at the same time.
For details on the parameters for this function, refer to
"A.6.6 Modify Cache Parameters (Thin Provisioning
For the factory default settings for this function, refer to
"Appendix B Modify Cache Parameters (Thin
Provisioning Pool)" (page 1008)
.
The procedure to modify cache parameters is as follows:
Procedure
1
Select which TPP to change the cache parameters for (multiple selections can be made) and
click [Modify Cache Parameters] in [Action].
If pinned data exists in the ETERNUS DX, MWC cannot be configured.
•
The same cache parameter can be applied for multiple TPPs in a single operation.
•
Cache parameters other than MWC are specified for each TPV. Refer to
"3.14 Modify Cache Parameters"
for details.
Summary of Contents for Eternus DX200F
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