Modify Cache Parameters (Thin Provisioning Pool) - Fujitsu ETERNUS DX60 S3 User Manual

Chapter 6 Thin Provisioning Pool Management

6.9 Modify Cache Parameters (Thin Provisioning Pool)

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.
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
(page 316)
For details on the parameters for this function, refer to
Pool)" (page 934).
For the factory default settings for this function, refer to
Provisioning Pool)" (page
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].
for details.
1008).
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"A.6.6 Modify Cache Parameters (Thin Provisioning
"Appendix B Modify Cache Parameters (Thin
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"3.14 Modify Cache Parameters"
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