Hey folks, A recovery scenario I'm looking at right now is this: 1: In a clean 3-node Ceph cluster (pacific, deployed with cephadm), the OS Disk is lost from all nodes 2: Trying to be helpful, a self-healing deployment system reinstalls the OS on each node, and rebuilds the ceph services 3: Somewhere in the deployment system are 'sensible defaults' that assume there are no stateful workloads, so the superblock is wiped from the other block devices attached to these nodes to prevent stale metadata conflicts 4: The ceph rebuild has no knowledge of prior states and is expected to simply restore based on discovery of existing devices. 5: Out of 5 block devices, 3 had their superblock wiped, 1 suffered mechanical failure upon reboot, and 1 is completely intact, with 'ceph-volume lvm list' returning the correct information. Is there a way to restore the 3 devices with wiped superblocks? Some basic attempts with fsck to find the superblocks on the disks that were affected yielded nothing. Thanks for your time reading this message. Cheers Phil _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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