You might receive an error of low free block count in your NCC report due to failed check sata_dom_fwv_check.

This plugin checks the SATA DOM SMART data and shows if anything is off from the expected result.

To free up blocks in the SATA DOM, we have a procedure called, “Trim Operation” which is effective and really quick. The trim operation consists of running a script called trim_satadom.sh which can be downloaded from the link provided in the below mentioned doc.

To get to know more about the NCC check and to see how the Trim operation works, take a look at- https://portal.nutanix.com/#/page/kbs/details?targetId=kA032000000PODRCA4