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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Cassandra on iSCSI?
Date Fri, 21 Jan 2011 17:07:20 GMT
On Fri, Jan 21, 2011 at 2:19 AM, Mick Semb Wever <mck@apache.org> wrote:
>
>> Of course with a SAN you'd want RF=1 since it's replicating
>> internally.
>
> Isn't this the same case for raid-5 as well?

No, because the replication is (mainly) to protect you from machine
failures; if the SAN is a SPOF then putting more replicas on it
doesn't help.

> And we want RF=2 if we need to keep reading while doing rolling
> restarts?

Yes.

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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