ITEM: CN2708L

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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