[Bugs] [Bug 1806244] New: An issue where the cpu iowait and load of the glusterfs-server alternately rise.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1806244

            Bug ID: 1806244
           Summary: An issue where the cpu iowait and load of the
                    glusterfs-server alternately rise.
           Product: GlusterFS
           Version: mainline
          Hardware: x86_64
                OS: Linux
            Status: NEW
         Component: glusterd
          Assignee: bugs at gluster.org
          Reporter: knjeong at growthsoft.co.kr
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community



Created attachment 1665166
  --> https://bugzilla.redhat.com/attachment.cgi?id=1665166&action=edit
glusterfs-server cpu load graph

Description of problem:


Our glusterfs-volume(3.12.15) consists of 3 replications as shown below.

Volume Name: nas
Type: Distributed-Replicate
Volume ID: 5a8cc386-85dc-4255-b287-352a499a28d5
Status: Started
Snapshot Count: 0
Number of Bricks: 2 x 3 = 6
Transport-type: tcp
Bricks:
Brick1: NAS01:/gluster1/nas
Brick2: NAS02:/gluster1/nas
Brick3: NAS03:/gluster1/nas
Brick4: NAS01:/gluster2/nas
Brick5: NAS02:/gluster2/nas
Brick6: NAS03:/gluster2/nas


The current issue is the alternating cpu iowait and cpu load on three
glusterfs-servers, with one, two or three simultaneously rising.

It was confirmed that iowait rises first before the load goes up.

However, since it is a volume consisting of 3 replications, the amount of reads
and writes is similar, making it difficult to analyze the cause.

The issue started from the day I remounted the volume on two clients (February
5), and I tried to remount and reboot the glusterfs-server to solve the
problem, but to no avail.

Can someone give me an answer?


Version-Release number of selected component (if applicable): 3.12.15


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

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