Hi Eugen,
Thanks for clarifying! I will just set the noout
flag and power off all servers. Hopefully, it will work fine.
Thanks,
Gagan
On Thu, Aug 7, 2025 at 5:59 PM Eugen Block <eblock@xxxxxx> wrote:
> No, that's not what I meant. Of course you need the noout flag, that's
> the first point on the list I sent. Other flags are not required as
> pointed out by croit.
> I have never disabled cephfs before shutting it down as mentioned by
> Gerard, so I can't comment on that.
>
> The procedure I quoted from SUSE is still working fine, that's how we
> power off our (cephadm) based clusters as well.
>
> Zitat von gagan tiwari <gagan.tiwari@xxxxxxxxxxxxxxxxxx>:
>
> > Hi Eugen,
> > I had deployed the cluster via cephadm. so, it's
> > container based. Just fyi..
> >
> > So, you meant I don't need to run any commands like "ceph osd set noout"
> ,
> > "ceph orch stop osd.<ID>" ,etc.
> >
> > I just need to power off all nodes starting clients nodes , osd nodes ,
> mon
> > , mds nodes and power them on after maintenance activity is over.
> >
> > Thanks,
> > Gagan
> >
> > On Wed, Aug 6, 2025 at 11:53 PM Eugen Block <eblock@xxxxxx> wrote:
> >
> >> You don't need to stop all the OSDs (or other daemons) manually, just
> >> shut down the servers (most likely you have services colocated). When
> >> they boot again, the Ceph daemons will also start automatically
> >> (they're handled by systemd). I can check tomorrow which steps exactly
> >> our shutdown procedure consists of when we have planned power outages
> >> etc.
> >>
> >> Zitat von gagan tiwari <gagan.tiwari@xxxxxxxxxxxxxxxxxx>:
> >>
> >> > HI Eugen,
> >> > We have 80 osds in the cluster.
> >> >
> >> > So, to stop them I will need to run the command *ceph orch stop
> >> osd.<ID>*
> >> > for all 80 osds one by one.
> >> > Is there any way to stop all of them in one command ?
> >> >
> >> > Also, once all nodes will be back after power maintenance activity ,
> >> will I
> >> > need to start all daemons mon , mds , osd,etc
> >> > ? or will they be up automatically once servers will be up ?
> >> >
> >> > Thanks,
> >> > Gagan
> >> >
> >> > On Wed, Aug 6, 2025 at 4:45 PM Eugen Block <eblock@xxxxxx> wrote:
> >> >
> >> >> Although SUSE discontinued their product, the procedure is still
> correct
> >> >> [0]:
> >> >>
> >> >> 1. Tell the Ceph cluster not to mark OSDs as out:
> >> >>
> >> >> ceph osd set noout
> >> >>
> >> >> 2. Stop daemons and nodes in the following order:
> >> >>
> >> >> Storage clients
> >> >>
> >> >> Gateways, for example NFS Ganesha or Object Gateway
> >> >>
> >> >> Metadata Server
> >> >>
> >> >> Ceph OSD
> >> >>
> >> >> Ceph Manager
> >> >>
> >> >> Ceph Monitor
> >> >>
> >> >> 3. If required, perform maintenance tasks.
> >> >>
> >> >> 4. Start the nodes and servers in the reverse order of the shutdown
> >> >> process:
> >> >>
> >> >> Ceph Monitor
> >> >>
> >> >> Ceph Manager
> >> >>
> >> >> Ceph OSD
> >> >>
> >> >> Metadata Server
> >> >>
> >> >> Gateways, for example NFS Ganesha or Object Gateway
> >> >>
> >> >> Storage clients
> >> >>
> >> >> 5. Remove the noout flag:
> >> >>
> >> >> ceph osd unset noout
> >> >>
> >> >> [0]
> >> >>
> >> >>
> >>
> https://documentation.suse.com/en-us/ses/7.1/html/ses-all/storage-salt-cluster.html#sec-salt-cluster-reboot
> >> >>
> >> >> Zitat von gagan tiwari <gagan.tiwari@xxxxxxxxxxxxxxxxxx>:
> >> >>
> >> >> > Hi Guys,
> >> >> > I have recently set-up a production ceph cluster
> >> which
> >> >> > consists of 3 monitor nodes and 7 Osd nodes.
> >> >> >
> >> >> > There is power maintenance activity scheduled at the data centre
> >> coming
> >> >> > weekend and due to that I need to power off all the devices.
> >> >> >
> >> >> > Can you please advise me on the safest way to power off all
> servers?
> >> >> >
> >> >> > Should I power off all 7 OSD servers one by one followed by all 3
> >> monitor
> >> >> > nodes or vice versa?
> >> >> >
> >> >> > Thanks,
> >> >> > Gagan
> >> >> > _______________________________________________
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> >> >>
> >> >>
> >> >> _______________________________________________
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> >> >>
> >>
> >>
> >>
> >>
>
>
>
>
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