I'm doing a research on move our data from MySQL to Cassandra 0.5.1

At first, I am doing it in the Windows XP, and read the record from MySQL then insert it into Cassandra. The write speed is ok, about 18,000 records per second.

But when I changed it into the 5 Linux Red Hat 5 Server, doing the same opertation, the write speed in downto 1000 records per second.

Why would this happend?

I am using the default config.

   Peng Guo