IBM System Storage Ideas Portal


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Status Submitted
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Apr 2, 2026

RELATED IDEAS

Is it possible to enable greater than 512 kNFS threads in CNFS? Ideally, the client would like to set the thread count to a max of 4096 (up from the 512 limit).

MLP has requested that IBM enable the ability to test with more than 512 kNFS threads in CNFS due to performance issues observed in their environment.  Specifically, MLP wants to increase the thread count to 2048 or 4096.   MLP is aware that CNFS is on the list of deprecated features.  https://www.ibm.com/docs/en/STXKQY/pdf/scale_deprecated_features.pdf.   However, MLP has observed workloads that exhibit inferior performance under Ganesha (CES) versus kernel NFSd.  MLP advised that they switched from CNFS to CES for workloads in the specific cluster and noted the performance difference.

FROM SCALE DEVELOPMENT - 

Currently, the Scale CLI is limiting that to 512, is a check in the mmchconfig script.   In summary, it sets /proc/fs/nfsd/threads.  Client is asking if this can be worked around, with the understanding that IBM cannot test/support against a higher value.

Idea priority Urgent

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