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: [email protected] [mailto:lustre-discuss- > [email protected]] On Behalf Of Robin Humble > Sent: February 8, 2009 11:29 PM > To: [email protected] > 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 > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
