5.4 Checking Operation after Installation and Preparing the HDD for Use C141-E234 5-13 Notes:
1. T he user can arbitrarily specify the following parameters according to the system
requirements:
• ARRE
• AWRE
• TB
• PER
2. T he 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 fo r 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.