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Managing the AMASS File System
6-00028-01 Rev A Cache Commands C-7
The example below illustrates how to display cache block list
values for volume groups 121 through123:
setcbwght
Assigns weight factor values to the cache block list numbers.
AMASS uses this weight factor to determine which cache block
to reuse next and reuses the cache block with the highest score.
The score is calculated by the weight factor (defined with the
setcbwght command) associated with the list the cache block
is on (defined with the setcblist command) multiplied by the
age of the cache block.
# su root
# cblist 121 123
VOLGRP Read Write
121 1 6
122 3 2
123 2 2
weight factor * age of cache block = score
Age of cache block = current time MINUS time cache block was put on free list.
When the cache block is reused, it is taken off the free list and put back on when
processing has completed. When it is put back on, AMASS creates a new
timestamp for the block. The oldest block is the one that has not been accessed
for the longest period of time in seconds.