Client io blocked when removing snapshot

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Hi, All

I used a rbd command to create a 6TB-size image, And then created a snapshot of this image. After that, I kept writing something like modifying files so the snapshots would be cloned one by one.
At this time, I did the fellow 2 ops simultaneously.

1. keep client io to this image.
2. excute a rbd snap rm command to delete snapshot.

Finally ,I found client io blocked for quite a long time. I used SATA disk to test, and felt that ceph makes it a priority to remove snapshot.
Also we use iostat tool to help watch the disk state, and it runs in full workload.

So, should we have a priority to deal with client io instead of removing snapshot?
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wukongming ID: 12019
Tel:0571-86760239
Dept:2014 UIS2 ONEStor

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