Andreas, > How does this interact (if at all) with bio_integrity_verify() code? > Does it mean if e.g. XFS is on storage with T10-PI that only one or > the other can be used, Yes. Although if your storage is sophisticated enough to be T10 PI capable, you are probably using redundancy inside the array and therefore not MD. But I think there are other problems with the callback approach. See my impending email. -- Martin K. Petersen Oracle Linux Engineering