vmstat output on SMP - 1 in 'b' column with 0 in 'wa' column
PROBLEM: Customer sees a '1' constantly in the block queue
("b" column from 'vmstat') with a corresponding %iowait
of '0' ("wa" column from 'vmstat'). Machine is an
8-way R40. Customer feels the block queue should not
be showing 1's, rather should be showing 0's. Why do
SMP machines show a constant '1' in the block queue?
ANSWER: The "lrud" daemon is needed to implement the
page-replacment mechanism on the multi-processor box.
This daemon normally would appear blocked, thus constant
1's in the "b" column of 'vmstat' on an idle SMP system.
Support Line: vmstat output on SMP - 1 in 'b' column with 0 in 'wa' column ITEM: CN2708L
Dated: August 1997 Category: N/A
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