libnvme(9) API Manual libnvme(9)

# [NAME](#NAME)

enum nvme\_id\_nsfeat - This field defines features of the namespace.

# [SYNOPSIS](#SYNOPSIS)

enum nvme\_id\_nsfeat {  
**NVME\_NS\_FEAT\_THIN** ,  
**NVME\_NS\_FEAT\_NATOMIC** ,  
**NVME\_NS\_FEAT\_DULBE** ,  
**NVME\_NS\_FEAT\_ID\_REUSE** ,  
**NVME\_NS\_FEAT\_IO\_OPT** ,  
**NVME\_NS\_FEAT\_MAM** ,  
**NVME\_NS\_FEAT\_OPTRPERF**

};

# [Constants](#Constants)

[NVME\_NS\_FEAT\_THIN](#NVME_NS_FEAT_THIN)

If set, indicates that the namespace supports thin provisioning. Specifically, the Namespace Capacity reported may be less than the Namespace Size.

[NVME\_NS\_FEAT\_NATOMIC](#NVME_NS_FEAT_NATOMIC)

If set, indicates that the fields NAWUN, NAWUPF, and NACWU are defined for this namespace and should be used by the host for this namespace instead of the AWUN, AWUPF, and ACWU fields in the Identify Controller data structure.

[NVME\_NS\_FEAT\_DULBE](#NVME_NS_FEAT_DULBE)

If set, indicates that the controller supports the Deallocated or Unwritten Logical Block error for this namespace.

[NVME\_NS\_FEAT\_ID\_REUSE](#NVME_NS_FEAT_ID_REUSE)

If set, indicates that the value in the NGUID field for this namespace, if non- zero, is never reused by the controller and that the value in the EUI64 field for this namespace, if non-zero, is never reused by the controller.

[NVME\_NS\_FEAT\_IO\_OPT](#NVME_NS_FEAT_IO_OPT)

If set, indicates that the fields NPWG, NPWA, NPDG, NPDA, and NOWS are defined for this namespace and should be used by the host for I/O optimization

[NVME\_NS\_FEAT\_MAM](#NVME_NS_FEAT_MAM)

If set, indicates that Multiple Atomicity Mode applies to write operations to this namespace. If cleared, indicates that Single Atomicity Mode applies to write operations to this namespace.

[NVME\_NS\_FEAT\_OPTRPERF](#NVME_NS_FEAT_OPTRPERF)

If set, indicates that the NPRG, NPRA, and NORS fields are defined for this namespace and should be used by the host for I/O optimization.

enum nvme\_id\_nsfeat October 2026

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Document: nvme_id_nsfeat-libnvme3(2) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli