Ceph not working / showing HEALTH_WARN

ptmtobi

New Member
Oct 15, 2025
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Hi, I'm fairly new to Proxmox and only just set up my first actual cluster made of 3 PCs/nodes.

Everything seemed to be working fine and showed up correctly and I started to set up Ceph for a shared storage.
I gave all 3 PCs an extra physical SSD for the shared storage additional to the Proxmox NVMe and installed Ceph on all 3 nodes.
Then I created the 3 OSDs with the SSDs, one per node. They all show green and up/in.
Then I created a pool, which immediately showed up below all 3 nodes on the left after refreshing.
After that I created 3 Monitors, one for each pool and they all show status running.

I was expecting it to be done and working but when I clicked on the Ceph overview, it showed status HEALTH_WARN.
The summary has two reports:
- Reduced data availability: 128 pgs inactive
- 3 slow ops, oldest one blocked for 2337 sec, osd.1 has slow ops

Before I wrote this post, the second one said 2 slow ops.
(update edit: it is now at 4)

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Does anyone have an idea what the issue could be? Any help appreciated and feel free to ask if more details are needed for a troubleshoot!
 
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