Hi.
I want to run my Ceph cluster in a 2 datacenter/room setup with pool
size/replica 3.
But I don't get it done to define the ruleset correctly - or at least I
am unsure if it is correct.
I have the following setup of my Ceph cluster:
> ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
> -1 91.00598 root company_spinning
> -12 45.50299 room dc3_spinning
> -11 45.50299 rack lan3_spinning
> -2 33.66600 host kong_spinning
> 8 hdd 3.73799 osd.8 up 1.00000 1.00000
> [...]
> 45 hdd 3.73799 osd.45 up 1.00000 1.00000
> -43 11.83699 host predator_spinning
> 21 hdd 1.69099 osd.21 up 1.00000 1.00000
> [...]
> 27 hdd 1.69099 osd.27 up 1.00000 1.00000
>
> [...]
>
> -10 45.50299 room dc6_spinning
> -49 11.83699 rack dev6_spinning
> -58 11.83699 host alien_spinning
> 29 hdd 1.69099 osd.29 up 1.00000 1.00000
> [...]
> 35 hdd 1.69099 osd.35 up 1.00000 1.00000
> -8 33.66600 rack lan6_spinning
> -3 33.66600 host king_spinning
> 3 hdd 1.87299 osd.3 up 1.00000 1.00000
> []...
> 47 hdd 3.73799 osd.47 up 1.00000 1.00000
>
> [...]
What I want to archieve is that at least one replica lives in another
datacenter than the remaining two. On which racks/hosts/osds within a
specific datacenter does not matter.
My ruleset looks like:
> rule replicated_ruleset_spinning {
> id 0
> type replicated
> min_size 1
> max_size 10
> step take company_spinning
> step choose firstn 2 type room
> step chooseleaf firstn -1 type host
> step emit
>
Is this correct... I'm in doubt...
Best from Berlin/Germany
Karsten
Ecologic Institut gemeinnuetzige GmbH
Pfalzburger Str. 43/44, D-10717 Berlin
Geschaeftsfuehrerin / Director: Dr. Camilla Bausch
Sitz der Gesellschaft / Registered Office: Berlin (Germany)
Registergericht / Court of Registration: Amtsgericht Berlin (Charlottenburg), HRB 57947
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