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docs: add jumbo frames note to common issues #9453

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merged 1 commit into from Dec 17, 2021
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docs: add jumbo frames note to common issues #9453

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4 changes: 4 additions & 0 deletions Documentation/ceph-common-issues.md
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Expand Up @@ -138,6 +138,10 @@ There are several common causes for the mons failing to form quorum:
for cleaning the previous cluster.
* A firewall may be blocking the ports required for the Ceph mons to form quorum. Ensure ports 6789 and 3300 are enabled.
See the [Ceph networking guide](https://docs.ceph.com/en/latest/rados/configuration/network-config-ref/) for more details.
* There may be MTU mismatch between different networking components. Some networks may be more
susceptible to mismatch than others. If Kubernetes CNI or hosts enable jumbo frames (MTU 9000),
Ceph will use large packets to maximize network bandwidth. If other parts of the networking chain
don't support jumbo frames, this could result in lost or rejected packets unexpectedly.

#### Operator fails to connect to the mon

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