- Notes, cautions, and warnings
- Getting started
- System concepts
- Storage environment
- Virtual storage
- Linear storage
- Disk groups
- RAID levels
- ADAPT
- Disk group utilities
- SSDs
- Spares
- Pools
- Changing pool settings
- Volumes and volume groups
- Volume cache options
- Overcommitting volumes
- About automated tiered storage
- Initiators, hosts, and host groups
- CHAP
- Host ports
- Attaching volumes to hosts
- Operating with a single controller
- Snapshots
- Copying volumes or snapshots
- Reconstruction
- Quick rebuild
- Updating firmware
- Managed logs
- LDAP
- DNS settings
- Peer connections
- Replication
- Full disk encryption
- Rescanning disks
- Clearing disk metadata
- Data protection during failover to a single controller
- SupportAssist
- About CloudIQ
- Event history
- Audit logs
- System metrics
- Dashboard
- Provisioning
- Working with volumes
- Volumes table
- Data protection table
- Creating volumes
- Modifying volumes
- Deleting volumes and snapshots
- Attaching volumes to hosts
- Detaching volumes from hosts
- Expanding volumes
- Rolling back virtual volumes
- Creating snapshots
- Resetting snapshots
- Copying volumes or snapshots
- Aborting a volume copy
- Add data protection
- Creating a replication set
- Modifying a replication set
- Deleting a replication set
- Initiating or scheduling a replication
- Suspending a replication
- Aborting a replication set
- Resuming a replication
- Managing replication schedules
- Working with hosts
- Working with volumes
- Settings
- Maintenance
- Other management interfaces
- Administering a log-collection system
- Settings changed by restoring defaults
- System configuration limits
- Best practices
- Glossary of terms
Dell PowerVault ME5 Series Administrator's Guide
Overprovisioning
The write amplification factor of an SSD is defined as the ratio of the amount of data actually written by the SSD to the amount of host/user data requested to be written. The write amplification factor affects wear-leveling calculations and is influenced by the characteristics of data written to and read from SSDs.
Data written in sequential LBAs aligned on 4KB boundaries results in the best write amplification factor. The worst write amplification factor typically occurs for randomly written LBAs of transfer sizes less than 4KB, originating on LBAs not on 4KB boundaries. Try to align your data on 4KB boundaries.
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