Can not use PVC for multi Pods

[quinhn-vnp]

I want to deploy an application with 2 pods on 1 pvc but it's not working.

• Piraeus deploy by Helm
• piraeus-server:v1.29.2, drbd-reactor:v1.6.0, drbd9-noble:v9.2.12

Please help to advise.
Thanks.

[WanzenBug]

RWX is not supported. I think we have a bug somewhere in the CSI driver, because it simply should not allow you to create such volumes in the first place.

[quinhn-vnp]

thanks, @WanzenBug.
I already tried with RWO pvc but it's still the same issues.

[WanzenBug]

Yes. Because RWO means only one node can use the volume at a time. On that node, there can be many Pods using the same volume. But if there is no scheduling constraint with some inter-pod affinity, the two Pods may be moved to different Nodes, and then you get this error.

In general, having two Pods access the same volume is almost always a bad idea. It's a poor API, and it is slow, too.

[quinhn-vnp]

@WanzenBug, that mean Linstor does not support to share pvc to multi nodes, right?

[WanzenBug]

Yes, that is right.

[quinhn-vnp]

@WanzenBug, thank for your advise