- Notes, cautions, and warnings
- Getting to Know PowerFlex
- Architecture
- Architecture
- System
- The MDM cluster
- Virtual IP Address
- Storage definitions
- Replication
- Protection and load balancing
- Cache
- Networking
- Monitor of SDC connections
- S.M.A.R.T. hardware monitoring
- Snapshots
- Performance
- Migrate volumes
- Implementing PowerFlex
- PowerFlex implementation in an ESXi-based system
- Other functions
- Maintenance
- Management tools
- PowerFlex VASA architecture
- Configuring direct attached storage (DAS)
- Architecture
Getting to know Dell PowerFlex v3.6.x
Persistent checksum
The persistent checksum feature applies to all I/Os—Application, Rebuild, Rebalance, and Migrate.
The checksum is also kept in RMcache (Read Memory Cache), protecting every block that is maintained in SDS memory against memory corruption. The checksum feature can be enabled at the Protection Domain level, and defined at the Storage Pool level. The feature is T10/DIF-ready.
- Pools with Fine Granularity with or without compression, have a persistent checksum by default. This checksum cannot be changed.
- Each I/O goes through compression, a checksum is calculated before it is written to the disk. There are two types of checksum:
- Fine Granularity layout saves checksum data before and after processing to guarantee data integrity (compressed or not).
- There are also system checksums for metadata.
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