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ceph osd backfill - some osd's dont appear to be balanced?

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Greetings!

We have a 3 node Proxmox cluster with 7 disk each.

All disk are Intel SSD DC S4510 that are 1.92TB capacity. All running the same firmware.

Each node is connected via a 25G MLAG pair via a Mellanox ConnectX-4.

Recently ceph has triggered the following alert:

Code:
# ceph health
HEALTH_WARN 1 backfillfull osd(s); 4 pool(s) backfillfull

For whatever reason it doesn't appear the OSD's are super balanced? Looks like we have some room to spare in the cluster. I did not setup the...

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