![]() S3 Data servicesĭata services, which are also referred to as head services, are responsible for taking client requests, extracting the required information, and passing it to the storage engine for further processing. The ephemeral SS instances are associated with the persistent storage to which they attach in ObjectScale. This functionality contrasts with a common Kubernetes behavior where instances that are lost during node failure are created elsewhere. ![]() The data segments in the persistent volumes that are lost are re-created across other nodes. ![]() During node failure, the SS instance and underlying persistent storage are lost. SS instances are assigned to be scheduled on a Kubernetes node. The key point to understand is that each SS instance in an object store is tied to a single Kubernetes node. The figure shows each SS instance connected to a single disk for simplicity. SS instances independently access dedicated volumes and disks The Objectstore_1 instance independently accesses dedicated volumes and disks for data storage on Kubernetes nodes.įigure 5. The following figure shows the relationship between disks and SS instances for this example. Topology trees for Kubernetes and Objectstore Each object store is aware of its own topology only.įigure 4. The following figure depicts the Kubernetes and object store topology trees from the preceding example. SS instances are used to store user object data, which includes any associated user object metadata, and system object metadata, such as where an object is stored on disk. At most, one SS instance from each object store is scheduled on a Kubernetes node. An SS provides disk access in an object store. In ObjectScale, a node is referred to as a Storage Server (SS). In a Kubernetes cluster, a node is a physical worker node. ObjectScale appliance is deployed with the ObjectScale software bundle package by default. The object stores reside on physical nodes within the Kubernetes cluster. An ObjectScale instance can have only one object store at a time. The Kubernetes cluster consists of nodes. Administrators can install only one ObjectScale instance per Kubernetes cluster. ![]()
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