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Yes you will need to change osd to host as you thought so that copies
will be separated between hosts. You will run into problems you see
until that is changed. It will cause data movement.
- ----------------
Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Thu, Jul 16, 2015 at 11:45 AM, Steve Dainard wrote:
> I originally built a single node cluster, and added
> 'osd_crush_chooseleaf_type = 0 #0 is for one node cluster' to ceph.conf
> (which is now commented out).
>
> I've now added a 2nd node, where can I set this value to 1? I see in the
> crush map that the osd's are under 'host' buckets and don't see any
> reference to leaf.
>
> Would the cluster automatically rebalance when the 2nd host was added? How
> can I verify this?
>
> The issue right now, is with two host, copies = 2, min copies = 1, I cannot
> access data from client machines when one of the two hosts goes down.
>
> # begin crush map
> tunable choose_local_tries 0
> tunable choose_local_fallback_tries 0
> tunable choose_total_tries 50
> tunable chooseleaf_descend_once 1
>
> # devices
> device 0 osd.0
> device 1 osd.1
> device 2 osd.2
> device 3 osd.3
>
> # types
> type 0 osd
> type 1 host
> type 2 chassis
> type 3 rack
> type 4 row
> type 5 pdu
> type 6 pod
> type 7 room
> type 8 datacenter
> type 9 region
> type 10 root
>
> # buckets
> host ceph1 {
> id -2 # do not change unnecessarily
> # weight 163.350
> alg straw
> hash 0 # rjenkins1
> item osd.0 weight 3.630
> item osd.1 weight 3.630
> }
> host ceph2 {
> id -3 # do not change unnecessarily
> # weight 163.350
> alg straw
> hash 0 # rjenkins1
> item osd.2 weight 3.630
> item osd.3 weight 3.630
> }
> root default {
> id -1 # do not change unnecessarily
> # weight 326.699
> alg straw
> hash 0 # rjenkins1
> item ceph1 weight 163.350
> item ceph2 weight 163.350
> }
>
> # rules
> rule replicated_ruleset {
> ruleset 0
> type replicated
> min_size 1
> max_size 10
> step take default
> step choose firstn 0 type osd <-- should this line be ''step
> chooseleaf firstn 0 type host"?
> step emit
> }
>
> # end crush map
>
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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