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From Jonathan Ellis <>
Subject Re: Linux HugePages and mmap
Date Mon, 14 Mar 2011 19:52:27 GMT
On Mon, Mar 14, 2011 at 1:59 PM, mcasandra <> wrote:
> Currently, in cassandra.yaml disk_access_mode is set to "auto" but the
> recommendation seems to be to use 'mmap_index_only'.

Wrong.  The recommendation is to leave it on auto.

> If we use HugePages then do we still need to worry about setting
> disk_access_mode to mmap? I am planning to enable HugePages and use
> -XX:+UseLargePages option in JVM. I had a very good experience using
> HugePages with Oracle.

HugePages has nothing to do with disk access mode.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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