Re: [HPDD-discuss] Clean shutdown

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