On 27/10/16 21:23, Matt Garman wrote: <snip>
If you have the ability to take these systems offline temporarily, you can also run "fsck" (file system check) on the C6 and C7 file systems. IIRC, ext4 can do a very basic kind of check on a mounted filesystem. But a deeper/more comprehensive scan requires the FS to be unmounted. Not sure what the rules are for xfs. But C6 uses ext4 by default so you could probably at least run the basic check on that without taking the system offline.
Don't bother with fsck on XFS filesystems. From the man page [fsck.xfs(8)]: "XFS is a journaling filesystem and performs recovery at mount(8) time if necessary, so fsck.xfs simply exits with a zero exit status". If you need a deeper examination use xfs_repair(8) and note that: "the filesystem to be repaired must be unmounted, otherwise, the resulting filesystem may be inconsistent or corrupt" (from the man page).