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Sizing Guidance

For guidance on hardware sizing refer to the Genesys Sizing Calculator. The Genesys Sizing calculator helps you evaluate resource utilization based on your requirements and make the proper hardware choice.

For more sizing related information and resources, refer to the Genesys Sizing Tools System Level Guide. Also, refer to the Genesys Orchestration Platform chapter in the Genesys Hardware Sizing Guide.

Orchestration Persistence - System Configuration and Storage

Orchestration Persistence is not commonly used, but this section provides you some sample guidelines to help understand the factors that must be considered in terms of system configuration and Cassandra sizing when persistence is enabled.

Consider a contact center with around 4.5 million interactions per year, 250 working days a year, and 12 business hours a day. That will approximately work out to around 25 interactions per minute. For this minimal traffic, the following basic system configuration is recommended:

  • three nodes for a quorum
  • each node with 8GB for the JVM
  • multiple cores (2+)
  • local secondary storage
It is good to have more number of cores as Cassandra is CPU intensive, especially during the compaction process.

Sample Disk Space Storage Calculation

The following disk space storage calculation table provides a sample estimate for:

  • 5000 active sessions with session persistence enabled,
  • average session JSON size of 45K,
  • and 2 Cassandra nodes with a replication factor of 2.

NR (Number of Rows) Assumes 5,000 active sessions 5,000
NC (Number of Columns) - per Row 1 for Session, 2 for SessionIDServerInfo 3
CNS (Column Name Size) - in bytes UTF(8) 8
CVS (Column Value Size) - in bytes Average of 45K for a session 45,000
RKS (Row Key Size) - in bytes 50
RF (Replication Factor) 2
Number of Nodes in Cluster 2
IPS (From column_index_size_in_kb in YAML file) 64
TNC (Total Number of Columns) NR*NC 15,000
Column Data (Amount of actual data in your cluster) TNC*CVS 675,000,000 45,000 (CVS)
Column Overhead TNC*(15+CNS) 345,000 23 (15+CNS)
Column Subtotal Column Data+Column Overhead 675,345,000
Row Header Overhead NR*(23+RKS) 365,000 73 (Row Header Overhead/NR)
Row Bloom Filter NR*((2+8)+CEILING+((((NC*4)+20/8),1)) 70,000 14 (Row Bloom Filter/NR)
Row Index (4+(IF((CEILING(((Column Subtotal/NR)/IPS),1)>1),CEILING(((Column Subtotal/NR)/IPS),1),0)*((CNS*2)+20)))*NR 380,000,000 76,000 (Row Index/NR)
Row Subtotal Row Header Overhead+Row Bloom Filter + Row Index 380,435,000
Data File Subtotal Column Subtotal + Row Subtotal 1,055,780,000
Per Node Data File Subtotal/Number of Nodes
(Includes replication and should be comparable to summation of all SSTABLES on disk for a single node)
SSTABLE Index NR*(10+RKS) 300,000
SSTABLE Bloom Filter ((NR*15)+20)/8 9,378
Base Storage (Data File Subtotal+SSTABLE Index)+SSTABLE Bloom Filter 1,056,089,378
Additional Replicas Base Storage*(RF-1) 1,056,089,378
Compaction Overhead Base Storage*RF 2,112,178,755
Total Storage (Base Storage+Additional Replicas)+Compaction Overhead 4,224,357,510
Per Node Total Storage/Number of Nodes 2,112,178,755
The above table is only a sample illustration. For additional guidance specific to your requirements, contact your account representative.

For more information on configuring and deploying Cassandra on Intel Architecture, refer to this document by Intel.

This page was last edited on January 23, 2019, at 08:00.
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