[Bug 543617] Re: very slow filesystem I/O

[Phillip Susi]

It seems like it only happens when there are plenty of dirty buffers
that need flushed, then it hangs waiting for the sync to complete, even
though that is done after maybe 30 seconds.  If you wait a while for the
system to settle, or sync before umount, then it is fine.  It also may
be related to the journal.  When I disable the journal it does not seem
to hang.

For that matter, there don't seem to be a bunch of dirty buffers left
around when I don't use the journal.  Each time I make a clean fs, and
restore a dump to it, then unmount it.  With the journal, the umount (
or sync if I do that first ) flushes a bunch of data to the disk, but
without the journal it does not.

-- 
very slow filesystem I/O
https://bugs.launchpad.net/bugs/543617
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