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CEPH OSDs Full, Unbalanced PGs, and Rebalancing Issues in Proxmox VE 8

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Scenario


I have a Proxmox VE 8 cluster with 6 nodes, using CEPH as distributed storage. The cluster consists of 48 OSDs, distributed across 4 servers with SSDs and 2 with HDDs.


Monday night, three OSDs reached 100% capacity and crashed:
  • osd.16 (pve118)
  • osd.23 (pve118)
  • osd.24 (pve119)
Logs indicate "ENOSPC" (No Space Left on Device), and these OSDs are unable to start.

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