Questions about rbd flatten command
Hello, I executed multiple 'rbd flatten' commands simultaneously on a client. The elapsed time of each flatten job increased as the number of jobs increased, and network I/O was nearly full. so, I have two questions. 1. isn’t the flatten job running within the ceph cluster? Why is client-side network I/O so high? 2. How can I apply qos for each flatten job to reduce network I/O? Sincerely,
I'm not sure, but it seems that read and write operations are performed for all objects in rbd. If so, is there any method to apply qos for flatten operation? 2024년 4월 1일 (월) 오후 11:59, Henry lol <pub.virtualization@gmail.com>님이 작성:
Hello,
I executed multiple 'rbd flatten' commands simultaneously on a client. The elapsed time of each flatten job increased as the number of jobs increased, and network I/O was nearly full.
so, I have two questions. 1. isn’t the flatten job running within the ceph cluster? Why is client-side network I/O so high? 2. How can I apply qos for each flatten job to reduce network I/O?
Sincerely,
Do these RBD volumes have a full feature set? I would think that fast-diff and objectmap would speed this.
On Apr 2, 2024, at 00:36, Henry lol <pub.virtualization@gmail.com> wrote:
I'm not sure, but it seems that read and write operations are performed for all objects in rbd. If so, is there any method to apply qos for flatten operation?
2024년 4월 1일 (월) 오후 11:59, Henry lol <pub.virtualization@gmail.com>님이 작성:
Hello,
I executed multiple 'rbd flatten' commands simultaneously on a client. The elapsed time of each flatten job increased as the number of jobs increased, and network I/O was nearly full.
so, I have two questions. 1. isn’t the flatten job running within the ceph cluster? Why is client-side network I/O so high? 2. How can I apply qos for each flatten job to reduce network I/O?
Sincerely,
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Yes, they do. Actually, the read/write ops will be skipped as you said. Also, is it possible to limit the max network throughput per flatten operation or image? I want to avoid the scenario where the flatten operation consumes network throughput fully.
participants (2)
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Anthony D'Atri
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Henry lol