> Op 26 okt. 2022 om 10:11 heeft mj <lists@xxxxxxxxxxxxx> het volgende geschreven: > > Hi! > > We have read https://docs.ceph.com/en/latest/man/8/mount.ceph, and would like to see our expectations confirmed (or denied) here. :-) > > Suppose we build a three-node cluster, three monitors, three MDSs, etc, in order to export a cephfs to multiple client nodes. > > On the (RHEL8) clients (web application servers) fstab, we will mount the cephfs like: > >> cehp1,ceph2,ceph3:/ /mnt/ha-pool/ ceph name=admin,secretfile=/etc/ceph/admin.secret,noatime 0 2 > > We expect that the RHEL clients will then be able to use (read/write) a shared /mnt/ha-pool directory simultaneously. > > Our question: how HA can we expect this setup to be? Looking for some practical experience here. > > Specific: Can we reboot any of the three involved ceph servers without the clients noticing anything? Or will there be certain timeouts involved, during which /mnt/ha-pool/ will appear unresposive, and *after* a timeout the client switches monitor node, and /mnt/ha-pool/ will respond again? Monitor failovers don’t cause a noticeable disruption IIRC. MDS failovers do. The MDS needs to replay. You can minimise the effect with mds_standby_replay. > > Of course we hope the answer is: in such a setup, cephfs clients should not notice a reboot at all. :-) > > All the best! > > MJ > _______________________________________________ > 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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