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    SubjectRe: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?)
    On Fri, 28 Sep 2007 07:28:52 -0600 (Jonathan Corbet) wrote:

    > Andrew wrote:
    > > It's unrelated to the actual value of dirty_thresh: if the machine fills up
    > > with dirty (or unstable) NFS pages then eventually new writers will block
    > > until that condition clears.
    > >
    > > 2.4 doesn't have this problem at low levels of dirty data because 2.4
    > > VFS/MM doesn't account for NFS pages at all.
    > Is it really NFS-related? I was trying to back up my 2.6.23-rc8 system
    > to an external USB drive the other day when something flaked and the
    > drive fell off the bus. That, too, was sufficient to wedge the entire
    > system, even though the only thing which needed the dead drive was one
    > rsync process. It's kind of a bummer to have to hit the reset button
    > after the failure of (what should be) a non-critical piece of hardware.
    > Not that I have a fix to propose...:)

    That's a USB bug, surely. What should happen is that the kernel attempts
    writeback, gets an IO error and then your data gets lost.

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      Last update: 2007-09-28 20:07    [W:0.021 / U:8.420 seconds]
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