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May 4th, 2021 09:00

CSI Isilon : sometimes client ip and root-client-ip are not cleared on pod restart

Hi,

 

We are using the CSI Isilon on several clusters and we encounter an annoying issue.

If a node fail or even during a pod restart, it occur that the client and root-client are not cleared on the nfs export.

It's quite annoying on RWO PV as new pod can't start and we have to manually clear the export on the NAS array.

Is anybody already encounter such issue ?

We are running vanilla kubernetes cluster on 1.18...

 

Thanks

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166 Posts

May 5th, 2021 00:00

Hi @thomas.menard,

Yes, we noticed that issue on hard node failure. It shouldn't happen on Pod restart or if you drain a node.

If we don't go through the normal Pod lifecycle the driver doesn't receive the NodeUnpublish call and therefore doesn't clear the client IP from the export.

 

Also, we developed a module named CSM resiliency to improve the behavior on node failure : https://www.youtube.com/watch?v=veFRQ7xvoT8

Once ready for PowerScale, it will clean the export in such a case and there will be no need for manual cleanup ; even in such a case.

 

Hope this helps.

 

May 5th, 2021 14:00

Well we have encountered this issue on node drain last time we did maintenance on one of our cluster (about 50 pvc).

It's quite annoying to clean all exports on cli....

But this issue is also occuring on pod restart but not so often, I'll try to gather some logs on the operator part just in case you find something.

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