Details
-
Bug
-
Resolution: Done
-
Minor
-
None
-
Lustre 2.10.5
-
3
-
9223372036854775807
Description
Are there on-disk format changes between Lustre 2.8fe and Lustre 2.10.x, even if one avoids use of new features to 2.10 like PFL and project quota, and avoids DNE2?
IE if we were to mount a Lustre 2.8fe file system with Lustre 2.10 kernel modules, and perform some mdtests and IORs, would there be on-disk changes that prevent the file system from being mounted again with 2.8fe kernel modules?
Is the answer different for ldiskfs than for ZFS backend?
The context would be performing tests before releasing the file system to users, after upgrading the software from 2.8fe to 2.10.x., and falling back to 2.8fe if the tests reveal a problem.