Fujitsu ETERNUS DX60 S3 User Manual page 202

Chapter 4 Volume Status
4.2 Performance (Host I/O)
A "-" (hyphen) is usually displayed for the following volumes:
• Volume type is "SDV" or "SDPV"
• Volumes that are created in a RAID group or a TPP configured with SSDs or SSD SEDs
• ODX Buffer volumes
• Cache Page Capacity
The cache page capacity is displayed.
When the cache page capacity is "-" (hyphen), there is no limit for the cache capacity.
A "-" (hyphen) is displayed when the volume type is "TPV", "FTV", or "WSV". Note that a "-" (hyphen) is
displayed for a "Standard" type volume that is concatenated by the LUN concatenation function.
• 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.
• SPMC
The value of the parameter (Sequential Parallel Multi I/O Count) to determine the sequentiality of data
access (Read I/O and Write I/O) is displayed. If the difference in addresses between the start address of the
previous I/O and the start address of the received I/O is within (I/O size x Specified value), it is determined
as sequential data.
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ETERNUS Web GUI User's Guide (Operation)
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