IBM System Storage Ideas Portal


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Status Submitted
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Nov 19, 2025

RELATED IDEAS

Provide helper to determine metadata size

We have a GNR cluster with > 650 million files, distributed over two filesystems. All disks are DataAndMetadata. Policy runs and mmbackup are taking very long. One speedup suggestion of the GPFS support was to use explicit metadata storage. Unfortunately no-one can tell what size is required for that storage because the space occupied by metadata is not shown anywhere and is quite complicated to calculate. We are completely in the dark about the required size of this storage. mmdf does not show this.

The only ones that can do the calculations correctly are the developers. So I my idea to provide a tool that scans the system and reports the size of the metadata. It could also offer a quick mode that calculates some lower and upper limits which would already help in ruling out some storage offers.

A more preferable option was the integration into the filesystem so that mmdf would show the metadata size also for this GNR setup.

Idea priority High

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