Terracotta Discussion Forums (LEGACY READ-ONLY ARCHIVE)

Please find my ehcache.xml file

<?xml version="1.0" encoding="UTF-8"?>
<ehcache
updateCheck="false"
monitoring="autodetect"
dynamicConfig="false"
maxBytesLocalHeap="100M"
>
<diskStore path="d:\\mycache" />
<defaultCache
maxBytesLocalHeap="75M"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
maxElementsOnDisk="20000000"
diskExpiryThreadIntervalSeconds="120" >
</defaultCache>
<cache name="employees"
maxBytesLocalHeap="75M"
maxElementsOnDisk="1111100000"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="true"
>
</cache>
</ehcache>

when i try to run my program with this configuration, since i have made overflowToDisk="true" it should start writing to disk once the heap size is overflown. but when i stop the program after few minutes of running wven the heap memory is not full i found out that at my disk storage location employees.data file is generated and it is having data of more than 1 mb. But accor to documentation it should write to disk if heap memory becomes overflow.

Help me in this