[Cassandra Wiki] Update of "Operations" by TristanTarrant

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The "Operations" page has been changed by TristanTarrant.
The comment on this change is: Added info about JNA and backups.
http://wiki.apache.org/cassandra/Operations?action=diff&rev1=70&rev2=71

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  This is caused by the operating system trying to allocate the child "ln" process a memory space as large as the parent process (the cassandra server), even though '''it's not going to use it'''. So if you have a machine with 8GB of RAM and no swap, and you gave 6GB to the cassandra server, it will fail during this because the operating system wants 12 GB of virtual memory before allowing you to create the process. 
  
  This error can be worked around by either :
+ 
+  * dropping the jna.jar file into Cassandra's lib folder (requires at least Cassandra 0.6.6)
+ 
+ OR
  
   * creating a swap file, snapshotting, removing swap file
  OR