Hi,
I just wanted to get a sanity check if possible, I apologize if my questions are stupid, I am still new to Ceph and I am feeling uneasy adding new nodes.
Right now we have one OSD node with 10 OSD disks (plus 2 disks for caching) and this week we are going to add two more nodes with the same hardware.
I want to change the replication from OSD to Host, do I just need to change the crushmap to the following?
OLD:
# rules
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step choose firstn 0 type osd
step emit
}
NEW:
# rules
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type host
step emit
}
My last question: After adding the new nodes/disks to the cluster, I assume re-balancing will start as soon as they are added... Do I need to wait for the data to rebalance before changing the crushmap to replicate across hosts?
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