Umount nfs strangely slow

Patrick O'Callaghan pocallaghan at gmail.com
Sat Apr 4 03:41:39 UTC 2009


On Fri, 2009-04-03 at 19:08 -0700, Jonathan Ryshpan wrote:
> I am mounting a few filesystems from one F10 machine to another.  Mount
> works rapidly but umount of each of the filesystems takes about 20
> seconds.  Is this normal?  Could I have the systems misconfigured in any
> obvious way?  Both machines have x86_64 processors.
> 
> Here is the file /etc/exports on the server machine:
>         /                              amito(ro,sync,no_root_squash)
> and here is the corresponding mount command on the client machine:
>         # mount -t nfs claremont:/        /mnt/claremont
> Here is a typical umount command on the client machine:
>         # time umount /mnt/claremont/
>         real	0m21.029s
>         user	0m0.001s
>         sys	0m0.004s
> 
> Any ideas?  Thanks - jon

Flushing write data because of sync? Is it equally slow if you just
mount and immediately unmount with no intervening activity?

poc




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