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Chapter 5 Volume Management
5.2 Functions in the Action Area for Volume
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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• Multi Writeback Count (MWC)
Specify the number of processes that can be written back at the same time.
• Prefetch Sequential Detect Count (PSDC)
Specify the number of times for sequential data detection to determine the sequentiality of data access
(Read IO).
• Sequential Dirty Detect Count (SDDC)
Specify the number of times for sequential data detection to determine the sequentiality of data access
(Write I/O).
• Sequential Slope (SS)
A parameter to determine the sequentiality of data access (Read I/O). Specify the number of LBAs by which
the previous I/O and the current I/O are considered as sequential data.
• Sequential Dirty Slope (SDS)
A parameter to determine the sequentiality of data access (Write I/O). Specify the number of LBAs by which
the previous I/O and the current I/O are considered as sequential data.
The procedure to modify cache parameters is as follows:
Procedure
1 Select which volume to change the cache parameters for (multiple selections can be made)
and click [Modify Cache Parameters] in [Action].
2 Change the cache parameters and click the [Modify] button.
Refer to " Volume types for which Cache Parameters are available" (page 153) for the volume types for
which the parameters can be specified.
• Cache Page Capacity
Specify the cache capacity that is used by volumes.
- "-" (hyphen)
- 32.50 MB
- 65.00 MB
- 130.00 MB
- 260.00 MB
- 520.00 MB
- 1040.00 MB
- 2080.00 MB (Not available for the ETERNUS DX80 S2)
• For TPVs, specify the MWC for each TPP. Refer to "7.2.8 Modify Cache Parameters (Thin Provisioning Pool)"
(page 241) for details.
• Cache parameters cannot be changed when pinned data exists in the ETERNUS DX Disk storage system.
The same cache parameter can be applied for multiple volumes in a single operation.