4.1 Important factors for sizing an InfoSphere BigInsights cluster4.1.1 Scalability4.1.2 Availability4.2 Customizing the predefined configurations4.3 IBM Spectrum Scale (formerly GPFS) considerations4.4 High availability considerations4.4.1 Designing for high availability4.5 Throughput and bandwidth considerations4.5.1 The data network4.5.2 Administrative/management network4.6 Data volumes considerations4.7 Security, user authentication, and edge nodes4.7.1 Security preferred practices in non-relational data stores4.7.2 Securing IBM Spectrum Scale4.7.3 Securing data storage and transaction logs4.8 Impact of use cases in design4.8.1 Workload characteristics definition