Hi,
I have a cephfs in production based on 2 pools (data+metadata).
Data is in erasure coding with the profile :
crush-failure-domain=host
crush-root=default
jerasure-per-chunk-alignment=false
k=3
m=2
plugin=jerasure
technique=reed_sol_van
w=8
Metadata is in replicated mode with k=3
The crush rules are as follow :
[
{
"rule_id": 0,
"rule_name": "replicated_rule",
"ruleset": 0,
"type": 1,
"min_size": 1,
"max_size": 10,
"steps": [
{
"op": "take",
"item": -1,
"item_name": "default"
},
{
"op": "chooseleaf_firstn",
"num": 0,
"type": "host"
},
{
"op": "emit"
}
]
},
{
"rule_id": 1,
"rule_name": "ec_data",
"ruleset": 1,
"type": 3,
"min_size": 3,
"max_size": 5,
"steps": [
{
"op": "set_chooseleaf_tries",
"num": 5
},
{
"op": "set_choose_tries",
"num": 100
},
{
"op": "take",
"item": -1,
"item_name": "default"
},
{
"op": "chooseleaf_indep",
"num": 0,
"type": "host"
},
{
"op": "emit"
}
]
}
]
When we installed it, everything was in the same room, but know we
splitted our cluster (6 servers but soon 8) in 2 rooms. Thus we updated
the crushmap by adding a room layer (with ceph osd crush add-bucket
room1 room etc) and move all our servers in the tree to the correct
place (ceph osd crush move server1 room=room1 etc...).
Now, we would like to change the rules to set a failure domain to room
instead of host (to be sure that in case of disaster in one of the rooms
we will still have a copy in the other).
What is the best strategy to do this ?
F.
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