Scenarios

If the existing disks of an ECS fail to meet service requirements, for example, due to insufficient disk space or poor disk performance, you can attach more available EVS disks to the ECS, or purchase more disks (Storage > Elastic Volume Service) and attach them to the ECS.

Prerequisites

• EVS disks are available.

  For instructions about how to purchase an EVS disk, see Purchasing an EVS Disk.

• The target disk is not locked.

  A locked disk cannot be attached.

Procedure

1. Log in to the management console.
2. Click in the upper left corner and select the desired region and project.
3. Under Computing, click Elastic Cloud Server.
4. In the search box above the upper right corner of the ECS list, enter the ECS name, IP address, or ID for search.
5. Click the name of the target ECS.

   The page providing details about the ECS is displayed.

6. Click the Disks tab. Then, click Attach Disk.

   The Attach Disk dialog box is displayed.

   Figure 1 Attach Disk
   
7. Select the target disk and set the device name as prompted.
   Device names are as follows:

   • For Xen ECSs, you can specify the device name of a disk, such as /dev/sdb.
   • For KVM ECSs, you can specify a disk as a system disk or data disk but cannot specify a device name for the disk.
   

   • If no EVS disks are available, click Create Disk in the lower part of the list.
   • For details about restrictions on attaching a disk, see What Are the Restrictions on Attaching an EVS Disk to an ECS?
   • The device names for the local disks and EVS disks mounted to a disk-intensive or ultra-high I/O ECS comply with the following rules:
     • System disk: Use sda or vda.
     • Local disk: Use the device name following sda or vda in alphabetical order.
     • EVS disk: Use the device name added in alphabetical order following those used by local disks.

     An example is provided as follows:

     A D1 ECS has two local disks. The device names of the two local disks are sdb and sdc (or vdb and vdc), and the device names of the EVS disks are sdd, sde, ... (or vdd, vde, ...).

8. Click OK.

   After the disk is attached, you can view the information about it on the Disks tab.

Follow-up Procedure

If the attached disk is newly created, the disk can be used only after it is initialized.

For instructions about how to initialize a data disk, see Introduction to Data Disk Initialization Scenarios and Partition Styles.