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    :NAS volume overview

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    :NAS volume overview

    Last Updated:Aug 23, 2024

    You can use Apsara File Storage NAS (NAS) volumes in Alibaba Cloud Container Compute Service (ACS) clusters. This topic describes the features, types, scenarios, limits, and billing of NAS volumes.

    Overview

    NAS is a cloud service that provides a file storage solution for compute nodes. The compute nodes include Elastic Compute Service (ECS) instances, Elastic High-Performance Computing (E-HPC) instances, and Container Service for Kubernetes (ACK) clusters. NAS is a distributed file storage solution that provides shared access, scalability, high reliability, and high performance.

    NAS uses Portable Operating System Interface of UNIX (POSIX)-based APIs and is compatible with native operating systems. NAS provides shared access, ensures data consistency, and implements mutual exclusion by using locks. NAS provides scalable file systems and allows simultaneous access to a NAS file system from multiple ECS instances. The storage capacity of a NAS file system automatically scales in or out when you add or remove files. NAS provides shared data sources for workloads and applications that run on multiple ECS instances or servers.

    Storage types

    NAS provides the following file system types: General-purpose NAS and Extreme NAS. For more information, see NAS types.

    Scenarios

    The following table describes the operations that you can perform on a NAS volume to meet your business requirements.

    Business requirement

    References

    Persist application data

    For more information, see the following topics:

    Limits

    • You must activate NAS before you can use NAS volumes.

    • NAS is a shared storage service. A persistent volume claim (PVC) that is used to mount a NAS file system can be used by multiple pods.

    • NAS volumes support only NFSv3.

    • The securityContext.fsgroup parameter is not supported by application templates.

    • Do not delete the mount target of a NAS file system before you unmount the NAS file system. Otherwise, an operating system hang issue may occur.

    • After a mount target is created, wait until the mount target changes to the Available state.

    • General-purpose NAS file systems and Extreme NAS file systems have different limits on mounting connectivity, the number of file systems, and file sharing protocols. For more information, see Limits.

    Billing

    For more information about the billing of NAS, see Billing of NAS file systems.