Cassandra Backup Strategy: When using local disks
<p>We are planning to deploy a Cassandra cluster with 100 virtual nodes. To store maximally 1TB (compressed) data on each node. We're going to use (host-) local SSD disks.</p>

<p>Infrustructure team recommends only using SANs(even for data) since it's easier for them to backup the data.<BR><BR></p>

<ol>
<li>Which of the following methods are recommended?
<BR> 

<ul>
<li>Using more <strong>local disks</strong> for backup</li>
<li>Using local disks for data and <strong>SAN</strong> for backup
<BR><BR></li>
</ul></li>
<li>Does the backup process have <strong>overhead</strong> which could slowdown Cassandra's write-heavy workloads?<BR>

<ul>
<li>overhead of <strong>copying</strong> the data to the backup disk</li>
<li>overhead of transferring data through <strong>network</strong> offsite</li>
</ul></li>
</ol>