There is a lot of information on care and feeding of your Cassandra cluster available on the wiki operations page 
http://wiki.apache.org/cassandra/Operations

There is also a section on how frequently repair should be run 
http://wiki.apache.org/cassandra/Operations#Frequency_of_nodetool_repair

Hope that helps. 
Aaron

On 20 Jan, 2011,at 01:31 AM, Stephen Connolly <stephen.alan.conno...@gmail.com> wrote:

On 19 January 2011 12:15, Donal Zang <zan...@ihep.ac.cn> wrote:
> Just to ensure.
> So this should be done manually by the cluster operators?

you could use crontab to automate it according to a schedule

>
> Thanks!
>
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