[Bug]: Mixcoord fails to start

[bigsheeper]

Is there an existing issue for this?

• [X] I have searched the existing issues

Environment

- Milvus version: 2.4
- Deployment mode(standalone or cluster):
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

The keep-alive fails, and there are slow logs in etcd. Maybe that an excessive amount of metadata is impacting etcd performance.

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[xiaofan-luan]

how large is the etcd?

We may think of deploy etcd on seperate disk and there seems to be a perf issue on our test env

[xiaofan-luan]

As far as I know, etcd is pretty stable on response for less than 10GB data