On Tue, Feb 23, 2010 at 7:31 AM, Jonathan Ellis <jbellis@gmail.com> wrote:
> (2)     How to use node has 12 1TB disk??

You should use a better filesystem than ext3. :)  We use xfs at rackspace.

Also, don't use RAID5.  Let Cassandra's replication handle disk failure scenarios instead, and supply multiple DataFileDirectory directives to unique mount points.  If you must use RAID, RAID0, 1, or 10 would be better.