Re: [HPDD-discuss] Clean shutdown

the 'lshowmount' command on the servers can do this. However I sometimes have seen where lshowmount doesn't show any connected clients, but they obviously still are. So maybe there's a lower-level way than that utility that's better. Scott On 7/6/2015 10:09 AM, Jérôme BECOT wrote: > That's how i proceed, but i had kernel crashes on the MDS so I unmounted > and remounted it and it recovers > > No way to check wether Lustre servers considers any client still connect > or not ? > > Le 04/07/2015 04:43, Kurt Strosahl a écrit : >> Hi, >> >> I just did a clean shutdown/startup of two lustre file systems >> last weekend (also for electrical work). The order that I've found >> most effective is to first shutdown all the clients, then unmount the >> osts/shutdown the oss systems, then unmount the mdt/mgs and shut down >> that system. On the up I've found that turning on the mdt/mgs system, >> letting it mount up. Then mounting the osts (my oss systems don't >> mount lustre on boot). Once the last ost to be mounted looks like it >> has finished any recovery it needs to do I mount a single client and >> make sure it can see the entire system... and then go from there with >> the rest of the clients. >> >> Since all the lustre clients I have are in the same room as the lustre >> file system itself I don't have to check for stray mounts (I just walk >> around the room looking for systems that are still on, and then power >> them off). >> >> Good luck, >> Kurt J. Strosahl >> System Administrator >> Scientific Computing Group, Thomas Jefferson National Accelerator >> Facility >> >> >> Message: 1 >> Date: Fri, 03 Jul 2015 13:49:32 +0200 >> From: J?r?me BECOT <jerome.becot(a)inserm.fr&gt; >> To: HPDD-discuss(a)ml01.01.org >> Subject: [HPDD-discuss] Clean shutdown >> Message-ID: <559676CC.1060009(a)inserm.fr&gt; >> Content-Type: text/plain; charset=utf-8; format=flowed >> >> Hi there, >> >> We are running a small lustre system (1MGS/MDS + 2 OSTs). I haven't >> found the information, so i ask you : >> >> What is the good order to shutdown the whole system (for electrical >> maintenance ...) when you run a combined MGT/MDT : >> - disconnect the clients >> - is there any way to check if there is a client still connected ? >> - unmount the MGT/MDT >> - unmount the OSTs >> - ... poweroff all the servers >> - mount the OSTs >> - then the MGT/MDT >> - then the clients ? >> >> or should I stop the ost first and mount them last ? >> >> Thanks >> >> > _______________________________________________ HPDD-discuss mailing list HPDD-discuss(a)lists.01.org https://lists.01.org/mailman/listinfo/hpdd-discuss