You can also just use a single command:
ceph osd crush add-bucket <hostname> host room=<the room>
> 在 2020年12月4日，00:00，Francois Legrand <f...@lpnhe.in2p3.fr> 写道：
>
> Thank for your advices.
>
> it was exactly what I needed.
>
> Indeed, I did a :
>
> ceph osd crush add-bucket <hostname> host
> ceph osd crush move <hostname> room=<the room>
>
>
> But also set the norecover, nobackfill and norebalance flags :-)
>
> It worked perfectly as expected.
>
> F.
>
>> Le 03/12/2020 à 01:50, Reed Dier a écrit :
>> Just to piggyback on this, the below are the correct answers.
>>
>> However, how I do it, which is admittedly not the best way, but it is the
>> easy way.
>> I set the norecover, nobackfill flags
>> I run my osd creation script against the first disk on the new host to make
>> sure that everything is working correctly, and also so that I can then
>> manually move my new host bucket where I need it in the crush map with
>>> ceph osd crush move {bucket-name} {bucket-type}={bucket-name}
>>
>> Then I proceed with my script for the rest of the OSDs on that host and know
>> that they will fall into the correct crush location.
>> And then of course I unset the norecover, nobackfill flags so that data
>> starts moving.
>>
>> I only mention this because it ensures that you don't fat finger the
>> hostname on manual bucket creation, or the hostname syntax doesn't match as
>> expected, and it allows you to course correct after a single OSD added,
>> rather than all N OSDs.
>>
>> Hope thats also helpful.
>>
>> Reed
>>
>>>> On Dec 2, 2020, at 4:38 PM, Dan van der Ster <d...@vanderster.com
>>>> <mailto:d...@vanderster.com>> wrote:
>>>
>>> Hi Francois!
>>>
>>> If I've understood your question, I think you have two options.
>>>
>>> 1. You should be able to create an empty host then move it into a room
>>> before creating any osd:
>>>
>>> ceph osd crush add-bucket <hostname> host
>>> ceph osd crush mv <hostname> room=<the room>
>>>
>>> 2. Add a custom crush location to ceph.conf on the new server so that
>>> its osds are placed in the correct room/rack/host when they are first
>>> created, e.g.
>>>
>>> [osd]
>>> crush location = room=0513-S-0034 rack=SJ04 host=cephdata20b-b7e4a773b6
>>>
>>> Does that help?
>>>
>>> Cheers, Dan
>>>
>>>
>>>
>>> On Wed, Dec 2, 2020 at 11:29 PM Francois Legrand <f...@lpnhe.in2p3.fr
>>> <mailto:f...@lpnhe.in2p3.fr>> wrote:
>>>>
>>>> Hello,
>>>>
>>>> I have a ceph nautilus cluster. The crushmap is organized with 2 rooms,
>>>> servers in these rooms and osd in these servers, I have a crush rule to
>>>> replicate data over the servers in different rooms.
>>>>
>>>> Now, I want to add a new server in one of the rooms. My point is that I
>>>> would like to specify the room of this new server BEFORE creating osd in
>>>> this server (so the data added to the osd will be directly at the right
>>>> location). My problem is that it seems that servers appears in the
>>>> crushmap only when they have osds... and when you create a first osd,
>>>> the server is inserted in the crushmap under the default bucket (so not
>>>> in a room and then the first data stored in this osd will not be at the
>>>> correct location). I could move it after (if I do it rapidly, there will
>>>> be no that much data to move after), but I was wondering if there is a
>>>> way to either define the position of a server in the crushmap hierarchy
>>>> before creating osd or eventually to specify the room when creating the
>>>> first osd ?
>>>>
>>>> F.
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>>
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