Re-implement RAID0/MergeFS in storagenode

actually it’s a worst idea ever, this node will be using RAID0 in that case. One disk failure and node is dead.
We are not going to re-implement a bad version of RAID any level, there are teams and products evolved for dozen years to do it reliable, so you may use them right now or start another node. Simple.

It will be even more fragile. The check is happening only for storage folder/location, not per satellite. One disk is disconnected and you “lost” the unattached data - the node is permanently disqualified within hours.
No, this is even more worst idea than re-implementing a RAID0 is to to try to implement a bad version of MergeFS.