TITLE    : I get an error running vmstat
OS LEVEL : AIX 4.x
DATE     : 16/03/99
VERSION  : 1.0

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"Read there was a request to a device that does not exist" 
when using vmstat but vmstat -f works okay.

Check that you have bos.acct (Accounting Services) installed :-

lslpp -L bos.acct

If not bos.acct is not installed, then install using :-

smit install_latest