Why Is the Device Name of My C6 ECS in the sd* Format?

Symptom

Root Cause

• If virtio-blk is allocated, the device name format is vd*.
• If virtio-scsi is allocated, the device name format is sd*.

Disk Partitioning and Formatting

• Method 1: Run fdisk to query the device name.

  Log in to the ECS and run the following command to query the data disk list:

  fdisk -l

  Information similar to the following is displayed, indicating the ECS has two disks attached. /dev/vda is the system disk, and /dev/vdb is the new data disk.

  [root@ecs-test-0001 ~]# fdisk -l
  
  Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
  Units = sectors of 1 × 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disk label type: dos
  Disk identifier: 0x000bcb4e
  
     Device Boot      Start         End      Blocks   Id  System
  /dev/vda1   *        2048    83886079    41942016   83  Linux
  
  Disk /dev/vdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
  Units = sectors of 1 × 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  
  

  This is a convenient method to obtain the device name, but you cannot obtain the mapping between the EVS disks attached to the ECS and the device names in the OS. If you want to know the mapping, obtain the device name by referring to method 2.

• Method 2: Use serial-id or wwn to obtain the device name.

  For details, see .

Automatic Mounting of File Systems

• Automatic Mounting for a System Disk
  • If a public image or a private image created from a public image is used, UUIDs are used for automatic disk mounting and no action is required.
  • If a private image created using a non-public image is used, select Enable automatic configuration when creating the image. Then, the system automatically uses UUIDs for automatic disk mounting.