Comment 7 for bug 543617
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| Phillip Susi (psusi) wrote Re: very slow filesystem I/O | #7 |
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f33e652
(Get the code!)
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.