Here's a crush ruleset for 8+2 that will choose 2 osds per host:
rule cephfs_data_82 { id 4 type erasure min_size 3 max_size 10 step set_chooseleaf_tries 5 step set_choose_tries 100 step take default class hdd step choose indep 5 type host step choose indep 2 type osd step emit } This is kind of useful because if you set min_size to 8, you could even lose an entire host and stay online. Cheers, dan On Thu, Mar 25, 2021, 7:02 PM by morphin <morphinwith...@gmail.com> wrote: > Hello. > > I have 5 node Cluster in A datacenter. Also I have same 5 node in B > datacenter. > They're gonna be 10 node 8+2 EC cluster for backup but I need to add > the 5 node later. > I have to sync my S3 data with multisite on the 5 node cluster in A > datacenter and move > them to the B and add the other 5 node to the same cluster. > > The question is: Can I create 8+2 ec pool on 5 node cluster and add > the 5 node later? How can I rebalance the data after that? > Or is there any better solution in my case? what should I do? > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io