1:16 a.m.
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>
> To: HPDD-discuss(a)ml01.01.org
> Subject: [HPDD-discuss] Clean shutdown
> Message-ID: <559676CC.1060009(a)inserm.fr>
> 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
>
>