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Date: Mon, 7 Apr 2014 12:25:28 -0400
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Subject: Migrating to new datacenter
From: Brandon McCauslin <bm3780@gmail.com>
To: user@cassandra.apache.org
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We're currently running a small 5 node 2.0.5 cluster in a single datacenter
using the SimpleStrategy replication strategy with replication factor of 3.
 We want to migrate our data from our current datacenter to a new
datacenter, without incurring any downtime or data loss.  There is no plan
to maintain or keep the old (current) datacenter after the migration is
complete.  I'm wondering how best to go about this migration.

*Shoud We:*

   1. add a 2nd datacenter as described here - "Adding a datacenter to
   cluster<http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html>",
   then decommission the 1st
datacenter<http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_decomission_dc_t.html>.
    Can we even do this given we're currently setup with SimpleStrategy
   replication?
   2. or should we just start adding new nodes from the new datacenter to
   our existing cluster as described
here<http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_node_to_cluster_t.html>?
    Then once we've added all the new nodes, start decommissioning all the old
   nodes from the old/current datacenter as described
here<http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_remove_node_t.html>
   .

Thanks for your help and time!

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<div dir=3D"ltr"><div>We&#39;re currently running a small 5 node 2.0.5 clus=
ter in a single datacenter using the SimpleStrategy replication strategy wi=
th replication factor of 3. =A0We want to migrate our data from our current=
 datacenter to a new datacenter, without incurring any downtime or data los=
s. =A0There is no plan to maintain or keep the old (current) datacenter aft=
er the migration is complete. =A0I&#39;m wondering how best to go about thi=
s migration.</div>
<div><br></div><div><b><u>Shoud We:</u></b></div><div><ol><li>add a 2nd dat=
acenter as described here - &quot;<a href=3D"http://www.datastax.com/docume=
ntation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html">Ad=
ding a datacenter to cluster</a>&quot;, then=A0<a href=3D"http://www.datast=
ax.com/documentation/cassandra/2.0/cassandra/operations/ops_decomission_dc_=
t.html">decommission the 1st datacenter</a>. =A0Can we even do this given w=
e&#39;re currently setup with SimpleStrategy replication?</li>
<li>or should we just start adding new nodes from the new datacenter to our=
 existing cluster as described=A0<a href=3D"http://www.datastax.com/documen=
tation/cassandra/2.0/cassandra/operations/ops_add_node_to_cluster_t.html">h=
ere</a>? =A0Then once we&#39;ve added all the new nodes, start decommission=
ing all the old nodes from the old/current datacenter as described=A0<a hre=
f=3D"http://www.datastax.com/documentation/cassandra/2.0/cassandra/operatio=
ns/ops_remove_node_t.html">here</a>.</li>
</ol><div>Thanks for your help and time!</div></div></div>

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