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Status Submitted
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Aug 24, 2026

RELATED IDEAS

per-file-system backgrondSpaceReclaimThreshold configuration parameters

As commented in https://ideas.ibm.com/ideas/GPFS-I-1306, the backgroundSpaceReclaim logic included in the recent Spectrum Scale version enables to trigger trim / unmap operations to NVME backend NSD disks while files / blocks are removed / freed on recent scale file systems. This complement the mmreclaimspace command as a live/dynamic mechanism to constantly optimise the underlying  NVME disk blocks performances.

The backgroundSpaceReclaim logic requires that NSD devices are properly configured as NVME devices (as when using the mmreclaimspace) but also requires to set the backgrondSpaceReclaimThreshold parameter to a value above 0 on the client nodes allowed to perform such trim / unmap operations dynamically.

Having a single parameter to control that behaviour seems insufficient as, depending on the file-systems characteristics, one would want to only allow the backgroundSpaceReclaim logic to be enabled on some file-systems mounted on the client nodes and/or with different backgrondSpaceReclaimThreshold value for every individual file-system (as the FS block/sub-block sizes may impact the trim / unmap operations efficiency).

Having a way to configure per-scale-file-ssytem backgrondSpaceReclaimThreshold parameters would ensure that one can properly tune and/or enable/disable this promising new logic.

Idea priority High

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