Very low speed in creating new replicas - cstor #3691
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mohammada315
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dear openebs developers
![Screenshot_2024-02-09_15-41-31](https://private-user-images.githubusercontent.com/29116372/303648295-880d5e33-303f-433a-b0eb-88eb11cb34d4.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.uylfwZN7SscsZu3HZ881fN8zuC-VsDSeIF08Z-KA5PU)
I have a Kubernetes cluster with 10 nodes ( 32Core , 128Gi ram , 128Gi SSD for host OS )
And now I am using c-stor ( replication 3 ) ( in HDD hard raid 5 )
When one of the nodes fails and I want to move the replicas
This operation is very slow
For example, a 200 GB replica takes 15-20 hours to upgrade from 2 to 3 replicas
For example in this example
To improve performance I made some changes according to this document
After editing the CVCs, the situation improved, but the speed is still low
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