[gpfsug-discuss] mmfsck runs very slowly on a small filesystem

Mengxing Cheng mxcheng at uchicago.edu
Thu Mar 9 19:23:38 GMT 2017


Dear all,

My name is Mengxing Cheng and I am a HPC system administrator at the University of Chicago. We have a GSS26 running gss2.5.10.3-3b and gpfs-4.2.0.3.

Recently, we run mmfsck on a relatively small filesystem with 14TB block and 73863102 inodes but it was unusually slow so as to not be able to finish in 48 hours. In contrast, mmfsck run on a filesystem with the same size and inodes but sitting on a traditional IBM DS3512 storage  took only 2 hours to complete.

In particular, the mmfsck run in parallel using 3 nodes within the GSS storage cluster, we notice that one gss storage server scans inodes much slower than the other gss storage server and the quorum service node.

Has anyone experience the same mmfsck performance issue?
Could anyone make recommendation to troubleshoot and improve mmfsck performance?

Thank you!


Mengxing


---
Mengxing Cheng, Ph.D.
HPC System Administrator
Research Computing Center
The University of Chicago

5607 S. Drexel Ave.
Chicago, IL 60637
email:    mxcheng at uchicago.edu
phone:  (773) 702-4070


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