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

[gluster-ant]

URL: https://bugzilla.redhat.com/1806244
Creator: knjeong at growthsoft.co.kr
Time: 20200223T08:29:42

Created attachment 1665166
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:

[stale]

Thank you for your contributions.
Noticed that this issue is not having any activity in last ~6 months! We are marking this issue as stale because it has not had recent activity.
It will be closed in 2 weeks if no one responds with a comment here.

[stale]

Closing this issue as there was no update since my last update on issue. If this is an issue which is still valid, feel free to open it.