[LU-7012] files not being deleted from OST after being re-activated

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.5.4
• Environment: RHEL-6.6, lustre-2.5.4
• Severity: 2
• Assignee: Mikhail Pershin
• Reporter: Dustin Leverman

Description

We had 4 OSTs that we deactivated because of an imbalance in utilization that was causing ENOSPC messages to our users. We identified a file that was consuming a significant amount of space that we deleted while the OSTs were deactivated. The file is no longer seen in the directory structure (the MDS processed the request), but the objects on the OSTs were not marked as free. After re-activating the OSTs, it doesn't appear that the llog was flushed, which should free up those objects.

At this time, some users are not able to run jobs because they cannot allocated any space.

We understand how this is supposed to work, but as the user in LU-4295 pointed out, it is not.

Please advise.

Issue Links

• is duplicated by: LU-4295 removing files on deactivated OST doesn't free up space
• is related to: LU-4825 lfs migrate not freeing space on OST