GitHub user svenknockaert added a comment to the discussion: Failed to create 
template from volume

In the meantime, I’ve made progress.
Following your suggestions, I focused on this line in the logs:
“error while reading at byte 3919577088: Input/output error qemu-img: error 
while reading at byte 3917479936.”

That made me concentrate on the storage layer and why these read errors were 
happening.
It turned out that the underlying storage network was dropping quite a few 
packets.
After resolving that issue and deleting the raw data (because it said "error 
while converting raw: error rbd create: File exists") from the Ceph RBD 
storage, the problem seemed to be fixed.

GitHub link: 
https://github.com/apache/cloudstack/discussions/11791#discussioncomment-14652798

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