Hello. I am reading. Thank you for information. Nguyen Huu Khoi On Fri, Nov 24, 2023 at 1:56 PM Eugen Block <eblock@xxxxxx> wrote: > Hi, > > basically, with EC pools you usually have a min_size of k + 1 to > prevent data loss. There was a thread about that just a few days ago > on this list. So in your case your min_size is probably 9, which makes > IO pause in case two chunks become unavailable. If your crush failure > domain is host (seems like it is) and you have "only" 10 hosts I'd > recommend to add a host if possible to be able to fully recover while > one host is down. Otherwise the PGs stay degraded until the host comes > back. > So in your case your cluster can handle only one down host, e. g. for > maintenance. If another host goes down (disk, network, whatever) you > hit the min_size limit. Temporarily, you can set min_size = k but you > should not risk anything and increase back to k + 1 after successful > recovery. It's not possible to change the EC profile of a pool, you'd > have to create a new pool and copy the data. > > Check out the EC docs [1] to have some more details. > > Regards, > Eugen > > [1] > > https://docs.ceph.com/en/quincy/rados/operations/erasure-code/?highlight=k%2B1#erasure-coded-pool-recovery > > Zitat von Nguyễn Hữu Khôi <nguyenhuukhoinw@xxxxxxxxx>: > > > Hello guys. > > > > I see many docs and threads talking about osd failed. I have a question: > > how many nodes in a cluster can be failed. > > > > I am using ec 8 + 2(10 osd nodes) and when I shutdown 2 nodes then my > > cluster crashes, It cannot write anymore. > > > > Thank you. Regards > > > > Nguyen Huu Khoi > > _______________________________________________ > > ceph-users mailing list -- ceph-users@xxxxxxx > > To unsubscribe send an email to ceph-users-leave@xxxxxxx > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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