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5.4 Checking Operation after Installation and Preparing the HDD for Use
C141-E234 5-13
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) Disconnection/reconnection parameters (page code = 2)
The following parameters are used to optimize the start timing of reconnection processing to transfer
data on the loop at a read (READ or READ EXTENDED command) or write operation (WRITE,
WRITE EXTENDED, or WRITE AND VERIFY command) of the disk. Refer to Chapter 3 “Data
Buffer Management” of the Fibre Channel Interface Specifications for further details.
Parameter Default value
• Buffer full ratio 00 (HEX)
• Buffer empty ratio 00 (HEX)
Notes:
1. In a system without the disconnection function, these parameters need not be specified.
2. Determine the parameter values in consideration of the following performance factors of the
system:
• Time required for reconnection processing
• Average amount of processing data specified with a command
Refer to Chapter 3 “Data Buffer Management” of the Fibre Channel Interface Specifications
for how to obtain the rough calculation values for the parameter values to be set. It is
recommended to evaluate the validity of the specified values by measuring performance in
an operation status under the average system load requirements.