This topic provides answers to some commonly asked questions about Apsara File Storage NAS.

What is NAS? What are the scenarios of NAS?

NAS is a distributed file sharing solution that features scalability, high reliability, and high performance. NAS supports POSIX-based APIs. A NAS file system can be mounted on thousands of compute nodes for shared storage. The compute nodes include Elastic Compute Service (ECS) instances, ECS Bare Metal instances, Alibaba Cloud Container Service for Kubernetes (ACK) clusters, Elastic Container Instance (ECI), BatchCompute instances, Elastic High Performance Computing (E-HPC) instances, and Machine Learning (PAI) models. NAS allows you to migrate business data from on-premises storage solutions to Alibaba Cloud without the need to modify your application code.

NAS provides the file sharing solution for ECS instances in the following scenarios:
  • To deploy web servers by attaching multiple ECS instances to a Server Load Balancer (SLB) instance, a shared storage space is required for the ECS instances to share data.
  • To implement centralized processing and analysis for log data of multiple ECS instances, a shared storage space is required for the ECS instances to store the log data.
  • To share files among business groups within an enterprise, a shared storage space is required to store data.

How can data be transitioned to the IA storage medium?

After you enable the lifecycle management feature and create a policy, data that meets the rule specified in the policy is automatically transitioned to the Infrequent Access (IA) storage medium. For example, you specify a rule that requires more than 14 days from the most recent access for a directory. If a file in the directory is not accessed for 14 days, the file is automatically transitioned to the IA storage medium.

What protocols are supported by NAS?

NAS supports the following protocols:
  • NFSv3 and NFSv4.
  • SMB 2.1 and later versions. NAS also supports operating systems including Windows 7, Windows Server 2008 R2, and later versions. However, NAS does not support Windows Vista, Windows Server 2008, or earlier versions.
  1. NFSv3 and NFSv4.
  2. SMB 2.1 and later versions. NAS also supports operating systems including Windows 7, Windows Server 2008 R2, and later versions. However, NAS does not support Windows Vista, Windows Server 2008, or earlier versions.

Which protocol can I select for a NAS file system?

We recommend that you select a protocol for the file system based on your business requirements.
  • If you want to share files among Linux clients, we recommend that you create a Network File System (NFS) file system.
  • If you want to share files among Windows clients, we recommend that you create a Server Message Block (SMB) file system.
  • If you want to share files between Linux clients and Windows clients, we recommend that you create an SMB file system.

What are the limits of NAS file systems?

  • You can create a maximum of 20 file systems in a region by using an Alibaba Cloud account.
  • The maximum capacity of a NAS Capacity file system is 10 PB. The maximum capacity of a NAS Performance file system is 1 PB.
  • A file system can contain a maximum of 1 billion files.

For more information, see Limits of product specifications.