CPFS General-purpose Edition offers two storage redundancy types: locally redundant storage (LRS) and zone-redundant storage (ZRS), to meet various data durability and service availability requirements.
How it works
LRS
LRS uses a data redundancy mechanism within a single zone. It stores redundant copies of your data on multiple devices across different facilities in the same zone. LRS ensures data durability and availability in the event of hardware failures. However, if the zone becomes unavailable due to a disaster, such as a fire or power outage, your data becomes inaccessible.
ZRS
ZRS uses a data redundancy mechanism across multiple zones. It distributes your data across multiple zones within the same region. Even if an entire zone becomes unavailable, CPFS ensures continuous data access and provides higher service availability.
This feature is available only to allowlisted users. To use this feature, submit a ticket to request access.
Choose a storage redundancy type
Comparison item | ZRS | LRS |
Supported storage classes | 100 MB/s/TiB Standard storage |
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Supported regions | China (Hangzhou), China (Beijing) More regions will be supported soon. | China (Hangzhou), China (Shanghai), and China (Beijing) |
Recovery Point Objective (RPO) The maximum amount of data loss that a business system can tolerate after a disaster. | 0 | Not recoverable |
Recovery Time Objective (RTO) The time it takes for a business system to recover from a downtime to an operational state after a disaster. | Minutes | Not recoverable |
Service-Level Agreement (SLA) | 99.99% | 99.9% |
Reliability/Durability | 99.999999999% (eleven 9s) | 99.999999999% (eleven 9s) |
Supported protocols | NFS v3.0 | NFS v3.0, POSIX |
Deployment zones | Multi-zone deployment | Single-zone deployment |
Mount target | Region-level mount target | Zone-level mount target (Has an zone attribute, must be in the same zone as the file system) |
Service interruption for single-node failure | ≤ 70s | ≤ 70s |
Service interruption for single-zone failure | ≤ 70s | Read and write services are unavailable |
Read latency for a single 4 KB IO request | 3 ms to 5 ms |
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Maximum read bandwidth per file system | 8.75 GB/s If you need a higher rate, please submit a ticket to apply. |
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Maximum read input/output operations per second (IOPS) per file system (4 KB IO) | 350,000 If you require higher IOPS, please submit a ticket. | CPFS-NFS:
CPFS-POSIX
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Starting capacity | 500 GiB | 3,600 GiB |
Maximum capacity | About 88 TiB (89,600 GiB) | 1 PiB |
Scaling step size | 100 GiB | 1,200 GiB |
Maximum number of files or directories per file system | 1 billion | 4 billion |
Feature support |
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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
A virtual private cloud (VPC) and a vSwitch are created in the destination region.
Ensure that your workloads run in a region that supports ZRS.
Procedure
Log on to the CPFS console.
On the General-purpose CPFS SE (Pay-As-You-Go) page, configure the file system.
Parameter
Description
Region
Select the region for the file system.
The file system must be in the same region as the ECS instance that you want to mount it to. CPFS file systems and ECS instances in different regions cannot communicate with each other.
Storage Type
100 MB/s/TiB Baseline. The throughput of the file system = Baseline throughput × Capacity. For more information, see Specifications.
Storage Redundancy Type
Zone-Redundant Storage.
Configure Capacity
Starting capacity: 500 GiB
Maximum capacity: About 88 TiB (89,600 GiB)
Scaling step size: 100 GiB
Select a capacity that meets your business needs and ensures sufficient space.
Encryption Type
The method for encrypting data at rest. This can be configured only when you create the file system and cannot be changed later.
Not Encrypted: Data is not encrypted. This is suitable for staging environments.
Managed Key: Alibaba Cloud automatically manages encryption keys. No configuration is required. This is suitable for regular encryption needs.
KMS-managed Key: Use KMS to manage your own keys. This 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 enable KMS-managed Key. It allows the file system to access the KMS service.
Key ID
This parameter is required if you enable KMS-managed Key.
Resource Group
Optional. Select a resource group for group 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.
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 instance.
ZRS Zone
Select three different zones to implement zone redundancy. A zone is a physical area within a region that has independent power and network infrastructure.
ZRS vSwitch
Select a vSwitch for each zone.
Service-linked Role
A service-linked role is required to create a CPFS file system. It allows the CPFS service to configure the network.
Click Buy Now and complete the purchase.
Creating the file system takes 15 to 20 minutes. After the file system is created, it is automatically configured for ZRS and provides the following capabilities:
Data is automatically and synchronously replicated across multiple zones.
Automatic failover occurs if a single zone fails, providing an RPO of 0 and an RTO within minutes.
A 99.99% service availability is guaranteed by the SLA.
View the storage redundancy type
Log on to the CPFS console.
In the left-side navigation pane, choose File System > File System List.
In the top navigation bar, select a region.
On the File System List page, click the target file system.
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.
Both redundancy types support pay-as-you-go billing.