Hi ,all
    Currenty i met a probleam with forceMerge(1). During forceMerging some of 
my machine spent too much time(10-20 hours for a index size of 15GB). By using 
some command like top, iostat, jstack. I found that the avg of cpu, and disk is 
too low, nearly zero.  And the size of the the index files increased very very 
slowly. From jstack, i found that the application is hanging on IO operations, 
like FileInputStream or DirectByteArray.  But when i did some copy operation on 
the machine the speed may become normal. 
    
    Should this issue be related with the JVM, Operating System and hardware?
    Did anybody met the same probleam, or have any idea about Java, Linux and 
IO.
    Some basic info about my system and application.
    
|  Lucece version | 4.10.3 |
| Jdk version |  jdk 1.7.0_05 |
| OS |   redhat 4.4.4 |
| cpu |      IntelX5650     |
| Memory | 24GB |


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