💭 Performance Difference between RWX and RWO volumes · longhorn/...

Performance Difference between RWX and RWO volumes · longhorn longhorn · Discussion #6964

Hey all, because of some internal testing I made a couple of experiments on our Cluster related to performance of RWX and RWO volumes. Because this might be of interest to some people I thought I s...

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Interesting longhorn storage performance test, author does highlight right away that this is a simulation and not a REAL test. I did not fully understand the storage semantics before reading through this.

• RWO - Always presents a filesystem ext4 or xfs
• RWX/ROX - Always presents a network share nfs to the pod.

This is an important distinction for applications that use sqlite or a tool on top of sqlite such as diskcache. With sqlite it is not recomended to run over nfs due to missing required file locking mechanisms.

Longhorn storage still provides a lot of benefits to these applications as the storage is automatically replicated, if the node that your application is running on goes offline a new pod will start on an existing node. If you have planned downtime, you can cordon and drain a node. Since the data is available in another location you will be able to start a new pod on anther node. barring your PodDisruptionBudget settings, taints, and affinity, this may happen automatically.