Storage redundancy

How it works

• Locally redundant storage (LRS)

  LRS replicates your data across multiple devices at different facilities within a single availability zone (AZ). LRS protects your data against hardware failures. However, if a disaster such as a fire or power outage causes the entire availability zone to become unavailable, your data becomes inaccessible.

• Zone-redundant storage (ZRS)

  ZRS synchronously replicates your data across multiple availability zones (AZs) within the same region. This design ensures that your data remains accessible for read and write operations even if an entire availability zone fails. This design provides higher availability.

  This feature is available only to allowlisted users. To use this feature, submit a ticket.

Choose a storage redundancy type

Create an LRS file system

To create a CPFS file system that uses LRS, see Create a file system.

Create a ZRS file system

Prerequisites

1. You have created a Virtual Private Cloud (VPC) and a VSwitch in the target region.

2. Ensure that your workloads are deployed in a region that supports ZRS.

Procedure

1. Log on to the CPFS console.

2. On the CPFS (pay-as-you-go) page, configure the parameters for the file system.

   Parameter	Description
   Region	Select the region where you want to create the file system. The file system must be in the same region as the ECS instances that will mount it. CPFS file systems and ECS instances in different regions cannot communicate with each other.
   Storage class	100 MB/s/TiB Baseline. The throughput of the file system is calculated as: Baseline Throughput × Capacity. For more information, see Specifications.
   Storage redundancy type	Zone-Redundant Storage.
   Capacity	Minimum capacity: 500 GiB Maximum capacity: Approximately 88 TiB (89,600 GiB) Scaling step: 100 GiB Select a capacity that meets your business requirements and ensures sufficient storage space.
   Encryption type	The method for encryption at rest. You can set this parameter only when you create the file system, and it cannot be modified afterward. Not Encrypted: Data is not encrypted. This option is suitable for development and test environments. Managed key: Alibaba Cloud automatically manages encryption keys. No configuration is required. This option is suitable for standard encryption requirements. KMS-managed key: Use KMS to manage your own keys. This option is suitable for scenarios with high compliance requirements. For more information, see Server-side encryption.
   Service-Linked Role	This Service-Linked Role is required if you select KMS-managed key. The role allows the file system to access the KMS service.
   Key ID	This parameter is required if you select KMS-managed key.
   Resource Group (Optional)	Select a resource group for resource management. If you do not select a resource group, the file system is added to the default resource group. For more information, see Best practices for designing resource groups. If you need to create a new resource group, click Create Resource Group. In the Create Resource Group dialog box, configure the Resource Group Identifier and Resource Group Name, and then click OK.
   Virtual Private Cloud (VPC)	Select the same VPC as your ECS instances.
   ZRS zones	Select three different availability zones to implement zone-redundant storage. An availability zone is a physical location within a region that has independent power and network resources.
   ZRS VSwitches	Select a VSwitch for each availability zone.
   Service-Linked Role	CPFS requires a Service-Linked Role to configure network resources.

3. Click Buy Now and complete the purchase as prompted.

   Creating the file system takes 15 to 20 minutes. Afterward, it is automatically configured for zone-redundant storage and provides the following capabilities:

   • Data is automatically and synchronously replicated across multiple availability zones.

   • Automatic failover occurs if a single availability zone fails, which provides an RPO of 0 and an RTO within minutes.

   • A Service Level Agreement (SLA) guarantees 99.99% service availability.

View the storage redundancy type

1. Log on to the CPFS console.

2. In the left-side navigation pane, choose File System > File System List.

3. In the top navigation bar, select a region.

4. On the File System List page, click the target file system.

5. On the Basic Information page of the file system, view the redundancy type of the file system.

   

Billing

• LRS and ZRS are billed at different rates. For pricing details, see the CPFS Pricing page.

• Pay-as-you-go billing is supported.

Related topics

• Create a file system

• Mount and access a file system

• Billing overview