[ADMIN] archive_command

[Kris Kiger]

   I've been playing around with recovery and am a bit confused as to 
when this method gets invoked. 
   At the moment, I have two servers set up, both of them with postgres 
installed.  Lets call them server A and server B.  Server A is running 
postgres and processing transactions.  Server B has postgres installed, 
but the postmaster is not running.  My archive_command is set to use 
rsync copy the wal log from server A to server B.  When i'm watching the 
number of wal files on server A I notice sometimes there are 3 files 
that have not been archived, sometimes there are 4, and sometimes there 
are more. 
   So, my question is, when is archive_command invoked?

Thanks in advance!
Kris
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