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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