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Chapter 5 Volume Management
5.1 Volume Status
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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• Write Throughput
The amount of transferred data that is written per second is displayed.
• Read Response Time
The average response time (for read) per millisecond is displayed.
• Write Response Time
The average response time (for write) per millisecond is displayed.
• Read Cache Hit Rate
The cache hit rate (for read) is displayed.
• Write Cache Hit Rate
The cache hit rate (for write) is displayed.
• Prefetch Cache Hit Rate
The cache hit rate (for prefetch) is displayed.
• Cache Page Capacity
The cache page capacity is displayed.
When the cache page capacity is "-" (hyphen), there is no limit for the cache capacity.
• PL
The prefetch limit is displayed. If PL is "0", prefetch is not performed.
• FP
The selected usage for the Force Prefetch Mode, which performs forcible prefetching for cache, is displayed.
- ON
Perform prefetch even if the sequential characteristics of the data access is not detected.
- OFF
Perform prefetch only when the sequential characteristics of the data access is detected.
• MWC
The value of the Multi Write back Count is displayed.
• PSDC
The number of times that sequentiality of data access (Read I/O) is detected (value of the Prefetch
Sequential Detect Count) is displayed. If any sequential data is accessed for the number of times specified
for PSDC, such access is determined as sequential access and prefetch is performed.
• SDDC
The number of times that sequentiality of data access (Write I/O) is detected (value of the Sequential Dirty
Detect Count) is displayed. If any sequential data is accessed for the number of times specified for SDDC,
such access is determined as sequential access and prefetch is performed.
• SS
The value of the parameter (Sequential Slope) to determine the sequentiality of data access (Read I/O) is
displayed. If the difference in addresses between the end LBA of the previous I/O and the start LBA of the
current I/O is within (SS setting + 1), it is determined as sequential data.
• SDS
The value of the parameter (Sequential Dirty Slope) to determine the sequentiality of data access (Write I/
O) is displayed. If the difference in addresses between the end LBA of the previous I/O and the start LBA of
the current I/O is within (SDS setting + 1), it is determined as sequential data.