Dell EMC VxFlex Ready Node, User Manual

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After you finish
For RFcache Acceleration Pools, ensure that caching is enabled, using the Configure
Caching > Set Read Flash Cache Policy command. This feature can be enabled at
Protection Domain, Storage Pool, or SDS level.
Add acceleration device
You can add an one or more acceleration devices to an SDS.
Before you begin
When adding NVDIMMs to a node, the enumeration of the DAX devices may change in
the node.
Name: /dev/dax0.0 Path: /dev/dax2.0 Original-path: /dev/dax0.0 ID:
ff9e65d600010000 Acceleration Pool: ac1, Capacity: 15.7 GB (16052
MB), Used: 2.9 GB (3003 MB), State: Normal
When adding a new NVDIMM DAX path to the acceleration pool it fails with the error:
cli --add_sds_device --sds_id <SDS-ID> --acceleration_pool_name
ac1 --device_path /dev/dax2.0 Error: MDM failed command.
Status: A device with the given
This is a very common scenario where the name of the device changes, especially in
Linux and any disk including NVDIMM devices. To fix this, run the following command:
scli --update_sds_original_paths --sds_id <SDS-ID>
The update is displayed:
Name: /dev/dax0.0 Path: /dev/dax2.0 Original-path: /dev/dax2.0 ID:
ff9e65d600010000 Acceleration Pool: ac1, Capacity: 15.7 GB (16052
MB), Used: 2.9 GB (3003 MB), State: Normal
Also if the current SDS device includes the name field, you must update it to match
the new path so that it is refected in the GUI. For example:
scli --rename_device --sds_id <SDS-ID> --device_path /dev/dax2.0 --
new_name /dev/dax2.0 Successfully renamed device to /dev/dax2.0
The following steps describe how to update from two to four NVDIMMs
1. Gracefully shutdown node (place SDS in maintenance mode and move application
workload to othernode)
2. Add two NVDIMMs
3. Boot up node.
4. Login and run
Exit SDS maintenance mode
from the GUI or CLI.
5. Run the following command:
scli --update_sds_original_paths --sds_id <SDS-ID>
Configuring the System using the VxFlex OS GUI
Dell EMC VxFlex Ready Node AMS User Guide 207