[CLOUDSTACK-8628] Ceph RBD only cluster with KVM does not fence properly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.6.0
• Security Level: Public (Anyone can view this level - this is the default.)
• Assignee: Wido den Hollander
• Reporter: Wido den Hollander
• Created: 13/Jul/15 20:46
• Updated: 13/Aug/15 10:01
• Resolved: 13/Aug/15 10:01

Description

When a NFS storage pool is present on a KVM cluster that pool is used for writing heartbeats to.

In case of a Ceph (RBD) only cluster such pools are not available and thus the KVM hosts do not write any heartbeats.

Should the KVM Agent crash for any reason they will be fenced of directly and this will cause a split-brain situation.

Fencing should not happen when no NFS storage pool is present as it is dangerous for data consistency. A Instance could be running on two hosts at the same time.

Issue Links

• is related to: CLOUDSTACK-8643 Helper for KVM High Availability