- Notes, cautions, and warnings
- Introduction
- Revision history
- PowerFlex overview
- System requirements and product limits
- Architecture
- System
- MDM cluster
- Virtual IP addresses
- Storage definitions
- Storage pools
- Acceleration pools
- Data layout
- Volumes
- Naming PowerFlex objects
- NVMe over TCP overview
- PowerFlex file services
- Replication
- Replication peer systems
- Storage data replicator
- Journal
- Replication consistency group
- Replication pairs
- Recovery point objective
- Replication I/O flow
- Replication auto-provision
- Replication initial copy
- Activating or terminating a replication consistency group
- Pause replication
- Using replicated volumes
- Accessing target volumes
- Setting up replication
- Dell APEX Block Storage
- Protection and load balancing
- Cache
- Networking
- SDC connection monitoring
- SMART hardware monitoring
- Snapshots
- Performance
- Migrating volumes
- Implementing PowerFlex
- Additional functions
- Maintenance
- PowerFlex management
- Configure direct attached storage
Dell PowerFlex 4.5.x Technical Overview
Data layout
PowerFlex offers a space efficient storage layout with fine granularity (FG).
With FG, since space allocation occurs at 4 KB, the data stored on the disk is significantly reduced. Space allocation for medium granularity (MG) occurs at 1 MB.
For FG, you must have NVDIMM configured as a DAX device. After NVDIMM is all set up in your environment, you need to configure an NVDIMM acceleration pool and then you can select it in the storage pool.
Data-compression is not supported for MG. It supports thin provisioned, zero padded volumes. Zero padded is enabled by default for FG and cannot be disabled. Zero padding is disabled for MG.
FG supports persistent checksum for data integrity.
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