cassandra_storage_sizing
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Example(from : http://btoddb-cass-storage.blogspot.com/).
All sizes are bytes unless otherwise noted
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NR1,000,000Number of Rows
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NC (per row)10Number of Columns per Row
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CNS8Column Name Size (in bytes)
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CVS4Column Value Size (in bytes)
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RKS50Row Key size (in bytes)
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RF3Replication Factor
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Number of Nodes9Number of Nodes in Cluster
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IPS1,024From column_index_size_in_kb in YAML file
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TNC (total)10,000,000Total Number of Columns (Calculated)
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Column data40,000,0004Amount of actual data in your cluster
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Column overhead230,000,00023
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Column Subtotal270,000,000
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Row header overhead73,000,00073
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Row bloom filter18,000,00018
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Row index4,000,0004
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Row Subtotal95,000,000
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Data file subtotal365,000,000Column data/overhead + Row data/overhead
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Per Node121,666,667Includes replication and should be comparable to summation of all SSTABLES on disk for a single node
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SSTABLE index60,000,000
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SSTABLE bloom filter1,875,003
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Base Storage426,875,003
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Additional Replicas853,750,005
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Compaction Overhead1,280,625,008
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Total Storage2,561,250,015
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Per Node284,583,335
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Example