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From Sean Bridges <>
Subject using more than 50% of disk space
Date Wed, 26 May 2010 16:50:17 GMT
We're investigating Cassandra, and we are looking for a way to get Cassandra
use more than 50% of it's data disks.  Is this possible?

For major compactions, it looks like we can use more than 50% of the disk if
we use multiple similarly sized column families.  If we had 10 column
families of the same size, we could use 90% of the disk, since a major
compaction would only need as much free space as the largest column family
(in reality we would use less).  Is that right?

For bootstrapping new nodes, it looks like adding a new node will require
that an existing node does anti-compaction.  This anti-compaction could take
nearly 50% of the disk.  Is there a way around this?

Is there anything else that would prevent us from using more than 50% of the
data disk.



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