Yes. The command just triggers the defragmentation which takes place
in the
background. Try a "sync" afterwards :)
Sorry Martin, I should have specified that I wondered if it was like
the scrub operation in that respect, so I left it several hours before
running filefrag again (and seeing that the number of extents was
unchanged). Top and iostat also don't report any particular activity
immediately after running the defrag command, so it doesn't look like
much if anything is happening.
By the way, this is on a filesystem mounted with -o autodefrag,
although per the docs I wasn't expecting the auto defragmentation to
work with the big VM images.
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