We had an unexpected increase on one of our mount points (~40GB) on a old RHEL 4 server (2.6.9-89.0.2 x86_64 kernel). It hit %100 usage ( Size and Used both said 37G, Avail said 0) as per df -h.
I found a directory that appeared to unused (some old backup software that we don't use at all). lsof had no record of it at all (including lsof | grep deleted). It was about 200 MB. I moved it to another disk partition with space available (and used sym link to point back to it.) It didn't reclaim any space. I ran sync; sync. Are my expectations off?
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