![]() Some popular platforms that provide containerization include Docker, Azure Container Registry, and Podman. In short, containers provide multiple isolated user spaces, while a virtual machine provides a complete operating system. The process of packaging the application is known as containerization. To overcome this issue, we can carry out OS-level virtualization through containers.Ī container is a user space where the server or the application and its environment reside alongside the required dependencies. For that reason, maintenance becomes costly and time-consuming.Īs we saw earlier, a Linux server in a virtual machine is not an optimal solution, let alone multiple Linux servers in multiple virtual machines. So, running multiple servers might have conflicts in the environment, such as one server depending on a newer library than the installed one. The environment includes basic utilities, dependencies, libraries, executables, and environment variables. flexvol_usenix08.Sometimes, we might need to run multiple servers on a single machine where we need to provide a neat environment for each server. In Proceedings of the USENIX Annual Technical Conference 2008 (USENIX ’08)Ī copy of the paper is attached to this posting. ![]() On the industry-standard SPEC SFS benchmark, FlexVol volumes exhibit less than 4% performance overhead, while providing all the benefits of virtualization. Our evaluation of FlexVol performance shows that it incurs only a minor performance degradation compared with traditional, nonvirtualized WAFL volumes. We also describe the new features enabled by this architecture. ![]() We present the basic architecture of FlexVol volumes, including performance optimizations that decrease the overhead of our new virtualization layer. FlexClone volumes and thin provisioning are a powerful combination, as they allow the creation of light-weight copies of live data sets while consuming minimal storage resources. FlexVol volumes also support thin provisioning a FlexVol volume can have a logical size that exceeds the available physical storage. FlexClone® volumes provide writable Snapshot® copies, using a FlexVol volume backed by a Snapshot copy of a different volume. ![]() We have enhanced SnapMirror®, a tool for replicating volumes between storage systems, to remap storage allocation during transfer, thus optimizing disk layout for the destination storage system. We also exploit this new virtualization layer to provide several powerful new capabilities. Multiple volumes can be dynamically created, deleted, resized, and reconfigured within the same physical storage container. The resulting virtual file volumes, or FlexVol® volumes, are managed independent of lower storage layers. We have used this technique to virtualize file volumes in the WAFL® file system, adding a level of indirection between client-visible volumes and the underlying physical storage. Virtualization is a well-known method of abstracting physical resources and of separating the manipulation and use of logical resources from their underlying implementation. We present the basic architecture of FlexVol volumes, including performance optimizations, and also describe the new features enabled by this architecture. FlexVol: Flexible, Efficient File Volume Virtualization in WAFLįlexVol: Flexible, Efficient File Volume Virtualization in WAFL.Academic-Industry Research Contribution.
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