Why are there so many [xfs-xxx/dm-y] processes on my OCP worker node ?

Solution Verified - Updated -

Issue

  • One of our worker nodes is showing a huge number of sleeping processes. I see a total of 3330. All the other nodes in the cluster have less than 600. These are docker processes and I'm not sure what is causing this.
  • These processes are like below via $ps -aux :
root      71184  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-buf/dm-6]
root      71185  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-data/dm-6]
root      71186  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-conv/dm-6]
root      71187  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-cil/dm-6]
root      71188  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-reclaim/dm-]
root      71189  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-log/dm-6]
root      71191  0.0  0.0      0     0 ?        S    Jan08   0:00 [xfsaild/dm-6]
root      71343  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-buf/dm-7]
root      71344  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-data/dm-7]
root      71345  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-conv/dm-7]
root      71346  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-cil/dm-7]
root      71347  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-reclaim/dm-]
root      71348  0.0  0.0      0     0 ?        S<   Jan08   0:00 [xfs-log/dm-7]
root      71350  0.0  0.0      0     0 ?        S    Jan08   0:00 [xfsaild/dm-7]
  • Please help to confirm whether it is normal.

Environment

  • Red Hat Openshift Container Platform 3+
  • RHEL 7+

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