• Elastic Cloud Server

ecs
  1. Help Center
  2. Elastic Cloud Server
  3. User Guide
  4. FAQs
  5. Disk FAQs
  6. Can Multiple Disks Be Attached to an ECS?

Can Multiple Disks Be Attached to an ECS?

Yes. Disk functions have been upgraded recently. The ECSs created after the disk function upgrade can be attached with up to 60 disks.
  • When creating an ECS, you can add 24 disks to it.
  • After an ECS is created, up to 60 disks can be attached to it. For details, see Table 1.
    Table 1 Numbers of disks that can be attached to newly created ECSs

    ECS Type

    Maximum VBD Disks

    Maximum SCSI Disks

    Maximum Local Disks

    Constraint

    XEN

    60

    59

    59

    VBD disks + SCSI disks + Local disks ≤ 60

    KVM (excepting D2 ECSs)

    24

    59

    59

    • VBD disks + SCSI disks + Local disks ≤ 60
    • SCSI disks + Local disks ≤ 59

    D2

    24

    30

    30

    • VBD disks + SCSI disks + Local disks ≤ 60
    • SCSI disks + Local disks ≤ 59
    NOTE:
    • The system disk of an ECS is of VBD type. Therefore, the maximum number of SCSI and local disks is 59.
    • For a D2 ECS, its local disks use two SCSI controllers, indicating that 30 SCSI drive letters are used. Therefore, a maximum of 30 SCSI disks can be attached to a D2 ECS.
The maximum number of disks attached to an ECS that is created before the disk function upgrade remains unchanged, as shown in Table 2.
Table 2 Numbers of disks that can be attached to existing ECSs

ECS Type

Maximum VBD Disks

Maximum SCSI Disks

Maximum Local Disks

Constraint

XEN

60

59

59

VBD disks + SCSI disks + Local disks ≤ 60

KVM

24

23

59

VBD disks + SCSI disks ≤ 24

To attach 60 disks, enable advanced disk. For details, see section Enabling Advanced Disk.

How Can I Check Whether an ECS Is Created Before or After the Disk Function Upgrade?

  1. Log in to management console.
  2. Under Computing, click Elastic Cloud Server.
  3. Click the name of the target ECS. The page providing details about the ECS is displayed.
  4. Click the Disks tab.
  5. Check the number of disks that can be attached to the ECS to determine the total number of disks.
    • If the total number of disks that can be attached is 24 (including the system disk), the ECS is created before the disk function upgrade. In such a case, you can enable advanced disk as prompted so that up to 60 disks can be attached to the ECS. For details, see section Enabling Advanced Disk.
    • If the total number of disks that can be attached is 60 (including the system disk), the ECS is created after the disk function upgrade.