Need some help resolving the performance issues on the my ceph cluster. We are running acute performance issues when we are using qemu-img convert. However rbd import operation works perfectly alright. Please ignore image format for a minute. I am trying to understand why rbd import performs well on the same cluster where as qemu-img convert operation takes inordinate amount of time. Here are the performance numbers: 1. qemu-img convert command for 465GB data took more than 48 hours to copy the image to ceph. [root@redhat-compute4 ~]# qemu-img convert -p -t none -O raw /var/triliovault-mounts/MTAuMC4wLjc3Oi92YXIvbmZzX3NoYXJl/workload_326e8a43-a90a-4fe9-8aab-6d33bcdf5a05/snapshot_9f0cee13-8200-4562-82ec-1fb9f234bcd8/vm_id_05e9534e-5c84-4487-9613-1e0e227e4c1a/vm_res_id_24291e4b-93d2-47ad-80a8-bf3c395319b9_vdb/66582225-6539-4e5e-9b7a-59aa16739df1 rbd:vms/volume-5ad883a0cd65435bb6ffbfa1243bbdc6(100.00/100%)You have new mail in /var/spool/mail/root[root@redhat-compute4 ~]# 2. Just copying the file to ceph took just 3 hours 18 mins (without qemu-img convert).
I appreciate if any one can give me pointers on where to look for? |
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