I see applications returning error 990 or “Structure needs cleaning”, what is wrong?
The error 990 stands for EFSCORRUPTED which usually means XFS has detected a filesystem metadata problem and has shut the filesystem down to prevent further damage. Also, since about June 2006, we converted from EFSCORRUPTED/990 over to using EUCLEAN, “Structure needs cleaning.” The cause can be pretty much anything, unfortunately – filesystem, virtual memory manager, volume manager, device driver, or hardware. There should be a detailed console message when this initially happens. The messages have important information giving hints to developers as to the earliest point that a problem was detected. It is there to protect your data. You can use xfs_check and xfs_repair to remedy the problem (with the file system unmounted).
