On Wed, Feb 21, 2018 at 11:56 PM, Oliver Freyermuth
<freyerm...@physik.uni-bonn.de> wrote:
> Am 21.02.2018 um 15:58 schrieb Alfredo Deza:
>> On Wed, Feb 21, 2018 at 9:40 AM, Dan van der Ster <d...@vanderster.com> 
>> wrote:
>>> On Wed, Feb 21, 2018 at 2:24 PM, Alfredo Deza <ad...@redhat.com> wrote:
>>>> On Tue, Feb 20, 2018 at 9:05 PM, Oliver Freyermuth
>>>> <freyerm...@physik.uni-bonn.de> wrote:
>>>>> Many thanks for your replies!
>>>>>
>>>>> Are there plans to have something like
>>>>> "ceph-volume discover-and-activate"
>>>>> which would effectively do something like:
>>>>> ceph-volume list and activate all OSDs which are re-discovered from LVM 
>>>>> metadata?
>>>>
>>>> This is a good idea, I think ceph-disk had an 'activate all', and it
>>>> would make it easier for the situation you explain with ceph-volume
>>>>
>>>> I've created http://tracker.ceph.com/issues/23067 to follow up on this
>>>> an implement it.
>>>
>>> +1 thanks a lot for this thread and clear answers!
>>> We were literally stuck today not knowing how to restart a ceph-volume
>>> lvm created OSD.
>>>
>>> (It seems that once you systemctl stop ceph-osd@* on a machine, the
>>> only way to get them back is ceph-volume lvm activate ... )
>>>
>>> BTW, ceph-osd.target now has less obvious functionality. For example,
>>> this works:
>>>
>>>   systemctl restart ceph-osd.target
>>>
>>> But if you stop ceph-osd.target, then you can no longer start 
>>> ceph-osd.target.
>>>
>>> Is this a regression or something we'll have to live with?
>>
>> This sounds surprising. Stopping a ceph-osd target should not do
>> anything with the devices. All that 'activate' does when called in
>> ceph-volume is to ensure that
>> the devices are available and mounted in the right places so that the
>> OSD can start.
>>
>> If you are experiencing a problem stopping an OSD that can't be
>> started again, then something is going on. I would urge you to create
>> a ticket with as many details as you can
>> at http://tracker.ceph.com/projects/ceph-volume/issues/new
>
> I also see this - but it's not really that "the osd can not be started again".
> The problem is that once the osd is stopped, e.g. via
> systemctl stop ceph.target
> doing a
> systemctl start ceph.target
> will not bring it up again.
>
> Doing a manual
> systemctl start ceph-osd@36.service
> will work, though.

In our case even that does not work reliably.
We're gathering info to create a tracker ticket.

Cheers, Dan

>
> The ceph-osd@36.service, in fact, is not enabled on my machine,
> which is likely why ceph.target will not cause it to come up.
>
> I am not a systemd expert, but I think the issue is that the 
> ceph-volume@-services which
> (I think) take care to activate the OSD services are not re-triggered.
>
> Cheers,
>         Oliver
>
>>
>>>
>>> Cheers, Dan
>
>
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