Is this a brand new install? If not try uninstalling then check to see if the pvcs do not delete. I had something similar happen in a test env. Then when I tried to re-install it could not attach the old pvc. At least from what I remember.

If brand new then check to see if the pvc is bound and of course all the logs. 

I have a 3 node Longhorn infrastructure. With 100gb in each node. Shall I increase to 4 node?

Since its showing insufficient storage 

PVC is bound to all 

Either that or increase the storage on the nodes. If a test environment I believe you can also tweak those pvc storage requests in the helm settings

https://docs.kasten.io/latest/install/advanced.html?highlight=helm

Here they are I believe:

@rbhowmik-sds I see the Kubelet is unable to attach or mount volumes for a pod. The exact cause of the error may be because the storage is already utilised as it is mentioned in the volume description.

yea, you might need to check if you have sufficient space in the nodes.


BR,

Ahmed Hagag