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Description of problem: e2fsprogs v1.42 adds the ability to create filesystems of 16tb and larger. We would like v1.42, or at least backport of its large filesystem support, in RHEL 6. Version-Release number of selected component (if applicable): RHEL 6.2 has v1.41, and presumably doesn't have a backport of large filesystem support as I haven't seen anything about this in the release notes. How reproducible: Always. Steps to Reproduce: 1. Attempt to create a filesystem of 16tb or larger on an array. Actual results: mkfs.ext4 fails. Expected results: With e2fsprogs v1.42, mkfs.ext4 should work
e2fsprogs-1.42 was a massive change to e2fsprogs compared to the RHEL6 codebase: 471 files changed, 44469 insertions(+), 14822 deletions(-) Those changes do not yet have sufficient testing or real-world experience to warrant enterprise support. It is also not yet complete; for example resize support is not there. In RHEL6, if you need > 16T, XFS is available and scales very well for large filesystems.
For now, in RHEL6 this is WONTFIX. If upstream gets to the point where >16T is feasible on ext4, we can re-open and/or re-consider this one. Today, XFS is available and robust for these usecases.