NAME

       enum nvme_smart_crit - Critical Warning

SYNOPSIS

       enum nvme_smart_crit {
           NVME_SMART_CW_ASCBT_SHIFT ,
           NVME_SMART_CW_TTC_SHIFT ,
           NVME_SMART_CW_NDR_SHIFT ,
           NVME_SMART_CW_AMRO_SHIFT ,
           NVME_SMART_CW_VMBF_SHIFT ,
           NVME_SMART_CW_PMRRO_SHIFT ,
           NVME_SMART_CW_ASCBT_MASK ,
           NVME_SMART_CW_TTC_MASK ,
           NVME_SMART_CW_NDR_MASK ,
           NVME_SMART_CW_AMRO_MASK ,
           NVME_SMART_CW_VMBF_MASK ,
           NVME_SMART_CW_PMRRO_MASK ,
           NVME_SMART_CRIT_SPARE ,
           NVME_SMART_CRIT_TEMPERATURE ,
           NVME_SMART_CRIT_DEGRADED ,
           NVME_SMART_CRIT_MEDIA ,
           NVME_SMART_CRIT_VOLATILE_MEMORY ,
           NVME_SMART_CRIT_PMR_RO

       };

Constants

       NVME_SMART_CW_ASCBT_SHIFT
                   Shift amount to get the available spare capacity has fallen below the threshold.

       NVME_SMART_CW_TTC_SHIFT
                   Shift  amount  to  get the temperature is either greater than or equal to an over temperature
                   threshold; or less than or equal to an under temperature threshold.

       NVME_SMART_CW_NDR_SHIFT
                   Shift amount to get the NVM subsystem reliability has been degraded due to significant  media
                   related errors or any internal error that degrades NVM subsystem reliability.

       NVME_SMART_CW_AMRO_SHIFT
                   Shift  amount  to  get the all of the media has been placed in read only mode. The controller
                   shall not set this bit if the read-only condition on the media is a result of a change in the
                   write protection state of a namespace.

       NVME_SMART_CW_VMBF_SHIFT
                   Shift amount to get the  volatile memory backup device has failed. This field is  only  valid
                   if the controller has a volatile memory backup solution.

       NVME_SMART_CW_PMRRO_SHIFT
                   Shift amount to get the Persistent Memory Region has become read-only or unreliable.

       NVME_SMART_CW_ASCBT_MASK
                   If set, then the available spare capacity has fallen below the threshold.

       NVME_SMART_CW_TTC_MASK
                   Mask to get the temperature is either greater than or equal to an over temperature threshold;
                   or less than or equal to an under temperature threshold.

       NVME_SMART_CW_NDR_MASK
                   Mask  to get the NVM subsystem reliability has been degraded due to significant media related
                   errors or any internal error that degrades NVM subsystem reliability.

       NVME_SMART_CW_AMRO_MASK
                   Mask to get the all of the media has been placed in read only mode. The controller shall  not
                   set  this  bit  if  the read-only condition on the media is a result of a change in the write
                   protection state of a namespace.

       NVME_SMART_CW_VMBF_MASK
                   Mask to get the volatile memory backup device has failed. This field is  only  valid  if  the
                   controller has a volatile memory backup solution.

       NVME_SMART_CW_PMRRO_MASK
                   Mask to get the Persistent Memory Region has become read-only or unreliable.

       NVME_SMART_CRIT_SPARE
                   If set, then the available spare capacity has fallen below the threshold.

       NVME_SMART_CRIT_TEMPERATURE
                   If  set, then a temperature is either greater than or equal to an over temperature threshold;
                   or less than or equal to an under temperature threshold.

       NVME_SMART_CRIT_DEGRADED
                   If set, then the NVM subsystem reliability has been degraded due to significant media related
                   errors or any internal error that degrades NVM subsystem reliability.

       NVME_SMART_CRIT_MEDIA
                   If set, then all of the media has been placed in read only mode. The controller shall not set
                   this bit if the read-only condition on the media is  a  result  of  a  change  in  the  write
                   protection state of a namespace.

       NVME_SMART_CRIT_VOLATILE_MEMORY
                   If  set,  then  the volatile memory backup device has failed. This field is only valid if the
                   controller has a volatile memory backup solution.

       NVME_SMART_CRIT_PMR_RO
                   If set, then the Persistent Memory Region has become read-only or unreliable.

August 2025                                   enum nvme_smart_crit                                    libnvme(2)