Details
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New Feature
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Resolution: Unresolved
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Major
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None
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Lustre 2.7.0, Lustre 2.8.0
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9223372036854775807
Description
In suppress ping environment the evicted client is not able to recover from evicted state until the first access to the server which evicted the client. In the situation, the access gets -EIO and immediately return. This may cause user job ends with error termination.
We can avoid the situation by running "lfs df" before every single operation. But it's really troublesome and we actually cannot do such a thing.
Eviction notifier, this patch provides, is one of the solution to the problem. With this function.
At first, the target(MDT, OST) which evicted a client notifies MGS an eviction event.
Then MGS send a request to the evicted client.
Finally, getting the request and the client sends a ping to the target server to find "I'm evicted".