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SubjectRe: backing up ext4 fs, system unresponsive, thrashing like crazy even though swap is unused
On Mon, 3 Dec 2012, Dimitrios Apostolou wrote:
>
> I've managed to reproduce the scenario with concurrent "du" commands running
> on the filesystems. I'll try doing it once more, but it may take a while to
> get the dmesg/slabinfo etc output, since even a realtime root shell is
> non-responsive for many minutes.
>
> What other debug output do you suggest to get, to find out why ext4 inodes
> are pinned?

Important detail: one of the filesystems contains *huge* maildirs,
containing hundreds of thousands of messages.


Dimitris



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