Fujitsu MBA3073FD, Product Manual

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5.4 Checking Operation after Installation and Preparing the HDDs for Use
Notes:
1. The user can arbitrarily specify the following parameters according to the system
requirements:
•
ARRE
•
AWRE
•
TB
•
PER
2. The user also can arbitrarily specify parameters other than the above. However, it is
recommended to use the default setting in normal operations.
(2)
Caching parameters (page code = 8)
The following parameters are used to optimize the HDD Read-Ahead caching operations under the
system environments. Refer to Chapter 3 "Data Buffer Management" of the FIBRE CHANNEL
INTERFACE MANUAL for further details.
Parameter Default value
• IC: Initiator control 0 (HDD-specific
control (page cache))
• RCD: Disabling Read-Ahead caching operations 0 (enabled)
• WCE: Write Cache Enable 1 (enabled)
• MF: Specifying the multipliers of "MINIMUM
PRE-FETCH" and "MAXIMUM PRE-
FETCH" parameters 0 (Specifying absolute
value)
• DISC: Prefetch operation after track switching during
prefetching 1 (enabled)
• DISABLE PRE-FETCH TRANSFER LENGTH X'FFFF'
• MINIMUM PRE-FETCH X'0000'
• MAXIMUM PRE-FETCH X'0000'
• MAXIMUM PRE-FETCH CEILING X'FFFF'
• NUMBER OF CACHE SEGMENTS X'08'
Notes:
1. When Read-Ahead caching operations are disabled by the caching parameter, these
parameter settings have no meaning except write cache feature.
2. Determine the parameters in consideration of how the system accesses the disk. When the
access form is not determined uniquely because of the processing method, the parameters
can be re-set actively.
3. For sequential access, the effective access rate can be increased by enabling Read-Ahead
caching operations and Write Cache feature.
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