- Notes, cautions, and warnings
- Overview of Unisphere
- Functionality supported by each OS type
- Capacity information
- Understanding resource usage
- Login authentication
- Understanding the system health score
- Manage jobs
- Unisphere for PowerMax alert monitoring recommendations
- Alerts
- Server alerts
- Understanding licenses
- Understanding user authorization
- Individual and group roles
- Roles
- User IDs
- Roles and associated permissions
- Roles for performing local and remote replication actions
- RBAC roles for SRDF local and remote replication actions
- RBAC roles for TimeFinder SnapVX local and remote replication actions
- Storage Management
- Understanding storage groups
- Understanding data reduction
- Understanding service levels
- Performance Impact
- Understanding storage templates
- Understanding Storage Resource Pools
- Understanding volumes
- Understanding disk groups
- Host Management
- Understanding hosts
- Understanding masking views
- Understanding port groups
- Understanding initiators
- Understanding PowerPath hosts
- Understanding mainframe management
- Data protection management
- Understanding Snapshot policy
- Understanding SRDF/Metro Smart DR
- Manage remote replication sessions
- Understanding SRDF groups
- Understanding migration
- Understanding Virtual Witness
- Understanding Open Replicator
- Open Replicator session options
- Understanding device groups
- Understanding TimeFinder/Mirror sessions
- Understanding TimeFinder SnapVX
- Understanding Performance Management
- Understanding Unisphere support for VMware
- Understanding eNAS
- Understanding iSCSI
- Understanding NVMe/TCP
- Understanding PowerMax File for storage systems
- Understanding serviceability
- Understanding PowerMax software system profiles and compliance
- Unisphere for PowerMax localized for Japanese market
- Where to get help
Dell Unisphere for PowerMax 10.0.1 Product Guide
Understanding data reduction
Data reduction allows users to reduce user data on storage groups and storage resources.
Data reduction is enabled by default and can be turned on and off at storage group and storage resource level.
If a storage group is cascaded, enabling data reduction at this level enables data reduction for each of the child storage groups. The user can disable data reduction on one or more of the child storage groups.
To turn the feature off on a particular storage group or storage resource, clear the Enable Data Reduction check box in the Create Storage Group, Modify Storage Group, or Add Storage Resource To Storage Container dialogs or when using the Provision Storage or Create Storage Container wizards.
The following are the prerequisites for using data reduction:
- Data reduction is only allowed on All Flash systems running the HYPERMAX OS 5977 Q3 2016 Service Release or PowerMaxOS 5978 or higher.
- Data reduction is allowed on FBA and CKD devices.
- The user must have at least StorageAdmin rights.
- The storage group must have an associated SRP.
- The associated SRP cannot be comprised, either fully or partially, of external storage.
Reporting
Users can see the current compression ratio on the device, the storage group and the SRP. Efficiency ratios are reported in units of 1/10:1.
NOTE: External storage is not in efficiency reports. Mixed SRPs with internal and external storage, only the internal storage is used in the efficiency ratio calculations.
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