- Notes, cautions, and warnings
- Introduction
- Revision history
- Initial configuration and setup
- Performing common tasks
- Expanding PowerFlex storage
- Displaying system information at a glance
- Managing block storage after PowerFlex deployment
- Protection domains
- Fault sets
- Storage data servers
- Storage pools
- Acceleration pools
- Devices
- Volumes
- NVMe targets
- Hosts
- Managing file storage
- High availability
- Multitenancy
- Overview of configuring NAS servers
- About file system storage
- File protection
- Create a protection policy
- Create snapshot rules
- Create a snapshot
- Modify a snapshot
- Delete a snapshot
- Assign a protection policy to a file system
- Unassign a protection policy
- Modify a protection policy
- Delete a protection policy
- Modify a snapshot rule
- Delete a snapshot rule
- Refresh a file system using snapshot
- Restore a file system from a snapshot
- Clone NAS server and file system
- Clone the file system
- Create a thin clone using a snapshot
- Protecting a block storage environment
- Snapshots
- Create snapshots
- Overwrite volume content from a snapshot
- Set bandwidth and IOPS limits for snapshots
- Lock and unlock snapshots
- Delete snapshots
- Map snapshots
- Unmap snapshots
- Increase the size of a snapshot
- Migrate a snapshot vTree
- Pause snapshot vTree migration
- Roll back snapshot vTree migration
- Set snapshot vTree migration priority
- Snapshot policies
- Remote protection
- Extract and upload certificates
- Journal capacity
- Add a peer system
- Restart the replication cluster
- SDRs
- Replication consistency group
- Replication direction and mapping
- Create a replication consistency group
- Map RCG target volumes to hosts
- Unmap a host from RCG target volumes
- Set the target to inconsistent mode
- Set the target to consistent mode
- Modify the recovery point objective
- Add a replication pair to an RCG
- Pause replication for an RCG
- Resume replication for an RCG
- Create a snapshot of an RCG volume
- Add an RCG snapshot policy
- Perform a failover
- Reverse replication
- Restore replication
- Test Failover
- Stop a failover test
- Freeze an RCG
- Unfreeze an RCG
- Activate an RCG
- Terminate replication in an RCG
- Delete an RCG
- Pause creation of an initial copy
- Resume creation of initial copy
- Set copying priority
- Unpair from RCG
- Snapshots
- Performing lifecycle operations for a resource group
- Deploying a resource configuration in a resource group
- Basic tasks
- Deploying a resource group
- Adding an existing resource group
- Updating a resource group with new firmware and software
- Viewing a compliance report
- Entering and exiting service mode
- Replacing a drive
- Replacing NVDIMM node or battery
- Reconfiguring MDM roles
- Migrating vCLS VMs to shared storage
- Adding components to a resource group
- Resize a volume
- Removing resources from a resource group
- Adding NVMe/TCP storage access
- Replacing the operating system for a node
- Additional resource group management tasks
- Basic tasks
- Preparing a template for a resource group deployment
- Basic tasks
- Additional template management tasks
- Deploying a resource configuration in a resource group
- Managing resources
- Basic tasks
- Discover a resource
- Viewing resource details
- Update resource inventory
- Viewing a compliance report for a resource
- Updating firmware and software
- Removing resources
- Additional resource management tasks
- Basic tasks
- Monitoring events and alerts
- Configuring system settings
- User management
- Repositories
- Getting started
- Networking
- Events and alerts
- License management
- Security
- Serviceability
- Software upgrade
- PowerFlex Manager user interface reference
- Maintenance for a PowerFlex controller node
- Retrieving logs for the PowerFlex nodes
- Retrieving logs for PowerFlex components
- Retrieving additional PowerFlex logs
- Enabling audit logging
- Managing storage devices using CloudLink
- Understanding NVMe over TCP load balancing
- Managing NAS server configuration
- Migrating to NVMe over TCP on VMware ESXi
Dell PowerFlex 4.6.x Administration Guide
Configure RMcache
RMcache uses RAM that is allocated for caching. Its size is limited to the amount of allocated RAM. By default, RMcache caching is disabled.
Prerequisites
- Enable RMcache at the storage pool level for all of the SDSs in the storage pool.
- RMcache must also be enabled at the SDS level.
About this task
For a read to be stored in the RAM of a specific SDS, the RMcache feature on that SDS must be enabled, and the relevant storage pool and the relevant volume must both be configured to use RMcache. Caching only begins after one or more devices are added to the SDS. The amount of RAM that you may allocate for RMcache is limited and can never be the maximum available RAM.
Enabling RMcache at the storage pool level allows you to control the cache settings for all SDSs in the storage pool. You can enable RAM caching for a storage pool and then disable caching on one or more SDSs individually.
NOTE:Only I/Os that are multiples of 4k bytes can be cached.
Steps
- On the menu bar, click .
- In the list of SDSs, select the relevant SDS, and click .
-
In the
SDS Cache Settings dialog box, select
Enable Read
RMcache. Enter the
RMcache cache size.
The minimum RMcache cache size is 128 MB.
- Click Apply.
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