NDCTL−ENABLE−NAMES - Online Linux Manual PageSection : 1
Updated : 02/24/2023
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NAMEndctl-enable-namespace − enable the given namespace(s)

SYNOPSISndctl enable−namespace <namespace> [<options>]

THEORY OF OPERATIONThe capacity of an NVDIMM REGION (contiguous span of persistent memory) is accessed via one or more NAMESPACE devices​. REGION is the Linux term for what ACPI and UEFI call a DIMM−interleave−set, or a system−physical−address−range that is striped (by the memory controller) across one or more memory modules​. The UEFI specification defines the NVDIMM Label Protocol as the combination of label area access methods and a data format for provisioning one or more NAMESPACE objects from a REGION​. Note that label support is optional and if Linux does not detect the label capability it will automatically instantiate a "label−less" namespace per region​. Examples of label−less namespaces are the ones created by the kernels memmap=ss!nn command line option (see the nvdimm wiki on kernel​.org), or NVDIMMs without a valid namespace index in their label area​. .it 1 an-trap
Note ¶.br Label−less namespaces lack many of the features of their label−rich cousins​. For example, their size cannot be modified, or they cannot be fully destroyed (i​.e​. the space reclaimed)​. A destroy operation will zero any mode−specific metadata​. Finally, for create−namespace operations on label−less namespaces, ndctl bypasses the region capacity availability checks, and always satisfies the request using the full region capacity​. The only reconfiguration operation supported on a label−less namespace is changing its mode​.
A namespace can be provisioned to operate in one of 4 modes, fsdax, devdax, sector, and raw​. Here are the expected usage models for these modes: •  fsdax: Filesystem−DAX mode is the default mode of a namespace when specifying ndctl create−namespace with no options​. It creates a block device (/dev/pmemX[​.Y]) that supports the DAX capabilities of Linux filesystems (xfs and ext4 to date)​. DAX removes the page cache from the I/O path and allows mmap(2) to establish direct mappings to persistent memory media​. The DAX capability enables workloads / working−sets that would exceed the capacity of the page cache to scale up to the capacity of persistent memory​. Workloads that fit in page cache or perform bulk data transfers may not see benefit from DAX​. When in doubt, pick this mode​. •  devdax: Device−DAX mode enables similar mmap(2) DAX mapping capabilities as Filesystem−DAX​. However, instead of a block−device that can support a DAX−enabled filesystem, this mode emits a single character device file (/dev/daxX​.Y)​. Use this mode to assign persistent memory to a virtual−machine, register persistent memory for RDMA, or when gigantic mappings are needed​. •  sector: Use this mode to host legacy filesystems that do not checksum metadata or applications that are not prepared for torn sectors after a crash​. Expected usage for this mode is for small boot volumes​. This mode is compatible with other operating systems​. •  raw: Raw mode is effectively just a memory disk that does not support DAX​. Typically this indicates a namespace that was created by tooling or another operating system that did not know how to create a Linux fsdax or devdax mode namespace​. This mode is compatible with other operating systems, but again, does not support DAX operation​.

OPTIONS<namespace> A namespaceX​.Y device name​. The keyword all can be specified to carry out the operation on every namespace in the system, optionally filtered by region (see −−region=option) −r, −−region= A regionX device name, or a region id number​. Restrict the operation to the specified region(s)​. The keyword all can be specified to indicate the lack of any restriction, however this is the same as not supplying a −−region option at all​. −b, −−bus= A bus id number, or a provider string (e​.g​. "ACPI​.NFIT")​. Restrict the operation to the specified bus(es)​. The keyword all can be specified to indicate the lack of any restriction, however this is the same as not supplying a −−bus option at all​. −v, −−verbose Emit debug messages for the namespace operation

COPYRIGHTCopyright © 2016 − 2022, Intel Corporation​. License GPLv2: GNU GPL version 2 http://gnu​.org/licenses/gpl​.html​. This is free software: you are free to change and redistribute it​. There is NO WARRANTY, to the extent permitted by law​.

SEE ALSOlinkndctl:ndctl−disable−namespace[1]
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