Disk Sharing

Disk sharing allows you to create shared EVS disks. Shared EVS disks are block storage devices that support concurrent read/write operations and can be attached to multiple servers. Shared EVS disks provide multiple attachments, high concurrency, high performance, and high reliability. They are usually used for enterprise business-critical applications that require cluster deployment and high availability (HA). Multiple servers can access the same shared EVS disk at the same time.

A shared EVS disk can be attached to a maximum of 16 servers, including ECSs or BMSs. To share files, you need to deploy a shared file system or a cluster management system, such as Windows MSCS, Veritas VCS, or CFS.

A shared file system or cluster management system must be set up before you can properly use a shared disk. If you simply attach a shared disk to multiple servers, data cannot be shared between those servers and may be overwritten.

Figure 1 Application scenario of shared EVS disks

Parent topic: Basic Concepts

Previous topic: Three-Copy Redundancy

Next topic: Disk Encryption

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