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From Eric Czech <>
Subject Re: Migration question
Date Tue, 14 Jun 2011 17:43:00 GMT
Thanks Aaron.  I'll make sure to copy the system tables.

Another thing -- do you have any suggestions on raid configurations for main
data drives?  We're looking at RAID5 and 10 and I can't seem to find a
convincing argument one way or the other.

Thanks again for your help.

On Mon, Jun 6, 2011 at 5:45 AM, aaron morton <>wrote:

> Sounds like you are OK to turn off the existing cluster first.
> Assuming so, deliver any hints using JMX then do a nodetool flush to write
> out all the memtables and checkpoint the commit logs. You can then copy the
> data directories.
> The System data directory contains the nodes token and the schema, you will
> want to copy this directory. You may also want to copy the cassandra.yaml or
> create new ones with the correct initial tokens.
> The nodes will sort themselves out when they start up and get new IP's, the
> important thing to them is the token.
> Cheers
> -----------------
> Aaron Morton
> Freelance Cassandra Developer
> @aaronmorton
> On 6 Jun 2011, at 23:25, Eric Czech wrote:
> > Hi, I have a quick question about migrating a cluster.
> >
> > We have a cassandra cluster with 10 nodes that we'd like to move to a new
> DC and what I was hoping to do is just copy the SSTables for each node to a
> corresponding node in the new DC (the new cluster will also have 10 nodes).
>  Is there any reason that a straight file copy like this wouldn't work?  Do
> any system tables need to be moved as well or is there anything else that
> needs to be done?
> >
> > Thanks!

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