Hi,
Can you try modifying osd_snap_trim_sleep ? The default value is 0, I have good results with 0.25 with a ceph cluster using SATA disks :
ceph tell osd.* injectargs -- --osd_snap_trim_sleep 0.25
Best regards,
----- Le 10 Déc 15, à 7:52, Wukongming <wu.kongming@xxxxxxx> a écrit :
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?
---------------------------------------------
wukongming ID: 12019
Tel：0571-86760239
Dept：2014 UIS2 ONEStor
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