Managing Regions
A region is a grouping of one or more NVDIMMs, or an interleaved set, that can be divided up into one or more Namespaces. Regions are of type PMEM or BLK. See PMEM or BLK modes for more information. Regions can only be created, destroyed, and configured using the vendor specific NVDIMM utility that manages the NVDIMMs or BIOS options, if available.
Listing Regions
Currently available regions can be shown using the -R or --regions flag to the ndctl list command, eg:
# ndctl list --regions
[
{
"dev":"region1",
"size":1623497637888,
"align":100663296,
"available_size":1623497637888,
"max_available_extent":1623497637888,
"type":"pmem",
"iset_id":-2506113243053544244,
"persistence_domain":"memory_controller"
},
{
"dev":"region0",
"size":1623497637888,
"align":100663296,
"available_size":1623497637888,
"max_available_extent":1623497637888,
"type":"pmem",
"iset_id":3259620181632232652,
"persistence_domain":"memory_controller"
}
]Filtering (Searching) the output
The output can be filtered on any filter supported by ndctl list, ie --bus, --region, --dimm, --namespace, --type, and --numa-node. For example:
Listing Disabled Regions
Disabled regions can be included in the show output using the -Ri or --regions --idle flags, eg:
Disabling Regions
1) List all active/enabled regions:
A filtered list of active/enabled regions can be displayed using the -r <region-id> or --region <region-id> option, eg:
2) Disable the region
3) Verify the region is disabled by including the -i option:
Enabling Regions
1) List disabled/inactive regions
A filtered list of active/enabled regions can be displayed using the -r <region-id> or --region <region-id> option, eg:
2) Enable the region
3) Verify the region is enabled using ndctl list -R. Note the 'state' field is not displayed for enabled regions.
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