[Lustre-discuss] speedy server shutdown

[Jerome, Ron]

If I'm not mistaken, "umount -f" will unmount your ost's (in fact any
lustre mount be it mds, mgs, ost, client) without delay.


Ron Jerome
National Reseach Council Canada


> -----Original Message-----
> From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-
> bounces at lists.lustre.org] On Behalf Of Robin Humble
> Sent: February 8, 2009 11:29 PM
> To: lustre-discuss at lists.lustre.org
> Subject: [Lustre-discuss] speedy server shutdown
> 
> Hi,
> 
> when shutting down our OSS's and then MDS's we often wait 330s for
each
> set of umount's to finish eg.
>   Feb  2 03:20:06 xemds2 kernel: Lustre: Mount still busy with 68
refs,
> waiting for 330 secs...
>   Feb  2 03:20:11 xemds2 kernel: Lustre: Mount still busy with 68
refs,
> waiting for 325 secs...
>   ...
> is there a way to speed this up?
> 
> we're interested in the (perhaps unusual) case where all clients are
> gone
> because the power has failed, and the Lustre servers are running on
UPS
> and need to be shut down ASAP.
> 
> the tangible reward for a quick shutdown is that we can buy a lower
> capacity (cheaper) UPS if we can reliably and cleanly shutdown all the
> Lustre servers in <10mins, and preferably <3 minutes. if we're
tweaking
> timeouts to do this then hopefully we can tweak them just before the
> shutdown and avoid running short timeouts in normal operation.
> 
> I'm probably missing something obvious, but I have looked through a
> bunch of /proc/{fs/lustre,sys/lnet,sys/lustre} entries and the
> Operations Manual and I can't actually see where the default 330s
comes
> from... ???
> it seems to be quite repeatable for both OSS's and MDS's.
> 
> we're using Lustre 1.6.6 or 1.6.5.1 on servers and patchless 1.6.4.3
on
> clients with x86_64 RHEL 5.2 everywhere.
> thanks for any help!
> 
> cheers,
> robin
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