21 Availability Service Stays up when component fails © 2018 Percona. 22 Availability via Redundancy Have more than one system Works well for stateless systems Is not enough for databases © 2018 especially “used right” Partial Replication/Syncronization Smart conflict resolution Cross Vendor Redundancy © 2018 Percona. 28 Sharding Split data set by certain criteria and store such “shards” on

adequate (10-50%) amount of free space available on a node. For disk fault tolerance and data redundancy, there are two reasonable approaches: • Use RAID0 on your data volume and rely on Cassandra replication practice than putting the commit log on the root volume (which is also a shared resource). For data redundancy, consider deploying your Cassandra cluster across multiple availability zones or using EBS volumes the data model is usually designed up front with the goal of normalizing the data to minimize redundancy. Normalization typically involves creating smaller, well-structured tables and then defining relationships

Greenplum Architecture 302 About the Greenplum Master 304 Master Redundancy 305 About the Greenplum Segments 305 Segment Redundancy 306 Segment Failover and Recovery 306 Example Segment Host Hardware Stack 307 Example Segment Disk Layout 308 About the Greenplum Interconnect 309 Interconnect Redundancy 309 Network Interface Configuration 309 Switch Configuration 310 About ETL Hosts for Data Loading Loading 326 About Redundancy and Failover in Greenplum Database 327 About Segment Mirroring 327 Segment Failover and Recovery 328 About Master Mirroring 328 About Interconnect Redundancy 329 About Database

Architecture 154 About the Greenplum Coordinator 156 Coordinator Redundancy 156 About the Greenplum Segments 157 Segment Redundancy 158 Segment Failover and Recovery 158 Example Segment Host Hardware Stack 158 Example Segment Disk Layout 159 About the Greenplum Interconnect 160 Interconnect Redundancy 160 Network Interface Configuration 160 Switch Configuration 161 About ETL Hosts for Data Loading Frozen XID 175 Example of XID Modulo Calculations 176 About Parallel Data Loading 177 About Redundancy and Failover in Greenplum Database 178 About Segment Mirroring 178 Segment Failover and Recovery

Greenplum Architecture 234 About the Greenplum Master 236 Master Redundancy 237 About the Greenplum Segments 237 Segment Redundancy 237 Segment Failover and Recovery 238 Example Segment Host Hardware Stack 238 Example Segment Disk Layout 239 About the Greenplum Interconnect 240 Interconnect Redundancy 240 Network Interface Configuration 240 Switch Configuration 241 About ETL Hosts for Data Loading Frozen XID 251 Example of XID Modulo Calculations 252 About Parallel Data Loading 253 About Redundancy and Failover in Greenplum Database 254 About Segment Mirroring 254 Segment Failover and Recovery

Greenplum Architecture 270 About the Greenplum Master 272 Master Redundancy 273 About the Greenplum Segments 273 Segment Redundancy 274 Segment Failover and Recovery 274 Example Segment Host Hardware Stack 275 Example Segment Disk Layout 276 About the Greenplum Interconnect 277 Interconnect Redundancy 277 Network Interface Configuration 277 Switch Configuration 278 About ETL Hosts for Data Loading Loading 294 About Redundancy and Failover in Greenplum Database 295 About Segment Mirroring 295 Segment Failover and Recovery 296 About Master Mirroring 296 About Interconnect Redundancy 297 About Database

About the Greenplum Master 264 Master Redundancy 265 VMware Tanzu Greenplum 6 Documentation VMware, Inc 11 About the Greenplum Segments 265 Segment Redundancy 266 Segment Failover and Recovery 266 Stack 267 Example Segment Disk Layout 268 About the Greenplum Interconnect 269 Interconnect Redundancy 269 Network Interface Configuration 269 Switch Configuration 270 About ETL Hosts for Data Loading Loading 283 About Redundancy and Failover in Greenplum Database 284 About Segment Mirroring 284 Segment Failover and Recovery 285 About Master Mirroring 286 About Interconnect Redundancy 286 About Database

Greenplum Architecture 258 About the Greenplum Master 260 Master Redundancy 261 About the Greenplum Segments 261 Segment Redundancy 262 Segment Failover and Recovery 262 Example Segment Host Hardware Stack 263 Example Segment Disk Layout 264 About the Greenplum Interconnect 265 Interconnect Redundancy 265 Network Interface Configuration 265 Switch Configuration 266 About ETL Hosts for Data Loading Frozen XID 277 Example of XID Modulo Calculations 278 About Parallel Data Loading 279 About Redundancy and Failover in Greenplum Database 280 About Segment Mirroring 280 Segment Failover and Recovery

Greenplum Architecture 288 About the Greenplum Master 290 Master Redundancy 291 About the Greenplum Segments 291 Segment Redundancy 292 Segment Failover and Recovery 292 Example Segment Host Hardware Stack 293 Example Segment Disk Layout 294 About the Greenplum Interconnect 295 Interconnect Redundancy 295 Network Interface Configuration 295 Switch Configuration 296 About ETL Hosts for Data Loading Loading 312 About Redundancy and Failover in Greenplum Database 313 About Segment Mirroring 313 Segment Failover and Recovery 314 About Master Mirroring 314 About Interconnect Redundancy 315 About Database

Greenplum 228 Introduction to Greenplum 0 The Greenplum Master 229 Master Redundancy 229 The Segments 230 Segment Redundancy 230 Segment Failover and Recovery 231 Example Segment Host Hardware Stack Layout 232 The Interconnect 232 VMware Greenplum v6.18 Documentation VMware, Inc. 8 Interconnect Redundancy 233 Network Interface Configuration 233 Switch Configuration 234 ETL Hosts for Data Loading requires more disk space and processing power. Parent topic: Introduction to Greenplum Master Redundancy You may optionally deploy a backup or mirror of the master instance. A backup master host serves