Hello, collective wisdom,
I'm new to the list and apologize if this is not the right place to ask this type of question and if so, would be glad receive pointers to the correct one.
Now the question:
I'm looking for ways to improve snapshot-merge target performance. We're using CentOS 7.3 here. Both, the snapshot-origin and the snapshot (cow data holder) reside on NVMe SSDs. What we've seen in our tests is that the speed of the merge isn't approaching neither the throughput nor the IOPS limits of the NVMe devices. I suspect it might be because the merge operation is single threaded and uses QD of 1.
Could anyone with enough knowledge about the DM code shed some light on how it operates during the merge? Are there any interfaces to improve the speed of this operation without altering the code?
Thanks,
Mike
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