Help Center/ Elastic Volume Service/ FAQs/ Attachment/ Can I Switch Between System Disks and Data Disks?
Updated on 2026-05-26 GMT+08:00
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Can I Switch Between System Disks and Data Disks?

Whether you can switch between system and data disks depends on the disk billing mode.

  • If you detach a system disk and then attach it to another server as a data disk, the maximum capacity of this disk is still 1 TiB.
  • If you detach a system disk and then attach it to another server as a system disk, ensure that this server uses the same image as the original server.

Pay-per-Use Disks

Table 1 Detaching and re-attaching of pay-per-use EVS disks

Original Use

Target Server

New Use

Supported

System disk

(It becomes a bootable disk after being detached.)

Attach to the same server

System disk

√

Data disk

√

Attach to another server

System disk

√

Data disk

√

Data disk

Attach to the same server

System disk

×

Data disk

√

Attach to another server

System disk

×

Data disk

√

Yearly/Monthly Disks

  • Yearly/Monthly EVS disks purchased together with a yearly/monthly server belong to the same order and are in a binding relationship. After such EVS disks are detached, they cannot be re-attached to other servers.
    • You can detach such a system disk and then re-attach it to the same server as a system disk or data disk.
    • You can detach such a data disk and then re-attach it to the same server as a data disk.
  • Yearly/Monthly EVS disks that are separately purchased can serve as data disks only. You can detach such a disk and then re-attach it to the same server or other servers as a data disk.
Parent topic: Attachment