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How Do I Obtain My Disk Name in the ECS OS Using the Device Identifier Provided on the Console?

Updated at: Sep 02, 2021 GMT+08:00

Scenarios

You find that the disk name displayed on the ECS OS is different from that displayed on the management console and you cannot determine which disk name is correct. This section describes how to obtain the disk name used on an ECS OS according to the device identifier on the console.

Obtaining the Disk ID of an ECS on the Console

  1. Log in to the management console.
  2. Under Compute, click Elastic Cloud Server.
  3. Click the target ECS name in the ECS list.

    The page providing details about the ECS is displayed.

  4. Click the Disks tab and then to expand the disk information.
  5. Check the device type and ID of the disk.

    If Device Identifier is not displayed on the web page, stop the ECS and restart it.

Using a Serial Number to Obtain the Disk Name (Windows)

If a serial number is displayed on the console, use either of the following methods to obtain the disk name.

cmd

  1. Start cmd in a Windows OS as an administrator and run either of the following commands:

    wmic diskdrive get serialnumber

    wmic path win32_physicalmedia get SerialNumber

    wmic path Win32_DiskDrive get SerialNumber

    A serial number is the first 20 digits of a disk UUID.

    For example, if the serial number of a VBD disk on the console is 97c876c0-54b3-460a-b, run either of the following commands to obtain the serial number of the disk on the ECS OS:

    wmic diskdrive get serialnumber

    wmic path win32_physicalmedia get SerialNumber

    wmic path Win32_DiskDrive get SerialNumber

    Information similar to the following is displayed:

    Figure 1 Obtaining the disk serial number
  2. Run the following command to check the disk corresponding to the serial number:

    wmic diskdrive get Name, SerialNumber

    Figure 2 Checking the disk corresponding to the serial number

PowerShell

  1. Start PowerShell as an administrator in a Windows OS.
  2. Run the following command to check the disk on which the logical disk is created:
    • Windows Server 2012 or later
      1. Run the following command to check the disk on which the logical disk is created:

        Get-CimInstance -ClassName Win32_LogicalDiskToPartition |select Antecedent, Dependent |fl

        As shown in Figure 3, the disk is Disk 0.

      2. Run the following command to view the mapping between the serial number and the disk:

        Get-Disk |select Number, SerialNumber

        As shown in Figure 3, the disk is Disk 0.

        Figure 3 Viewing the disk on which the logical disk is created
    • Versions earlier than Windows 2012
      1. Run the following command to check the disk on which the logical disk is created:

        Get-WmiObject -Class Win32_PhysicalMedia |select Tag, Serialnumber

      2. Run the following command to view the mapping between the serial number and the disk:

        Get-WmiObject -Class Win32_LogicalDiskToPartition |select Antecedent, Dependent |fl

Using a Serial Number to Obtain a Disk Device Name (Linux)

If a serial number is displayed on the console, run either of the following commands to obtain the device name.

# udevadm info --query=all --name=/dev/xxx | grep ID_SERIAL

# ll /dev/disk/by-id/*

A serial number is the first 20 digits of a disk UUID.

For example, if the serial number of the VBD disk is 62f0d06b-808d-480d-8, run either of the following commands:

# udevadm info --query=all --name=/dev/vdb | grep ID_SERIAL

# ll /dev/disk/by-id/*

The following information is displayed:

[root@ecs-ab63 ~]# udevadm info --query=all --name=/dev/vdb | grep ID_SERIAL
E: ID_SERIAL=62f0d06b-808d-480d-8
[root@ecs-ab63 ~]# ll /dev/disk/by-id/*
lrwxrwxrwx 1 root root  9 Dec 30 15:56 /dev/disk/by-id/virtio-128d5bfd-f215-487f-9 -> ../../vda
lrwxrwxrwx 1 root root 10 Dec 30 15:56 /dev/disk/by-id/virtio-128d5bfd-f215-487f-9-part1 -> ../../vda1
lrwxrwxrwx 1 root root  9 Dec 30 15:56 /dev/disk/by-id/virtio-62f0d06b-808d-480d-8 -> ../../vdb

/dev/vdb is the disk device name.

Using a VBD to Obtain a Disk Device Name (Linux)

  1. Run the following command to use a BDF to obtain the device name:

    ll /sys/bus/pci/devices/BDF disk ID/virtio*/block

    For example, if the BDF disk ID of the VBD disk is 0000:02:02.0, run the following command to obtain the device name:

    ll /sys/bus/pci/devices/0000:02:02.0/virtio*/block

    The following information is displayed:

    [root@ecs-ab63 ~]# ll /sys/bus/pci/devices/0000:02:02.0/virtio*/block
    total 0
    drwxr-xr-x 8 root root 0 Dec 30 15:56 vdb

    /dev/vdb is the disk device name.

Using a WWN to Obtain the Disk Name (Windows)

  1. Obtain the device identifier on the console by referring to Obtaining the Disk ID of an ECS on the Console.
  2. Manually convert the WWN.

    For example, the obtained WWN (device identifier) is 688860300003252ffa16520d39517815.

    1. Obtain the 21st to 17th digits that are counted backwards (3252f).
    2. Convert a hexadecimal (3252f) to a decimal (206127).
  3. Start PowerShell as an administrator in a Windows OS.
  4. Run the following command:

    Get-CimInstance Win32_DiskDrive | Select-Object DeviceID, SerialNumber

  5. In the command output, the disk whose serial number ends with 206127 is the disk corresponding to the WWN.
    Figure 4 Disk with the serial number ending with 206127

Using a WWN to Obtain a Disk Device Name (Linux)

  1. Log in to the ECS as user root.
  2. Run the following command to view the disk device name:

    ll /dev/disk/by-id |grep WWN|grep scsi-3

    For example, if the WWN obtained on the console is 6888603000008b32fa16688d09368506, run the following command:

    ll /dev/disk/by-id |grep 6888603000008b32fa16688d09368506|grep scsi-3

    The following information is displayed:

    [root@host-192-168-133-148 block]# ll /dev/disk/by-id/ |grep 6888603000008b32fa16688d09368506 |grep scsi-3
    lrwxrwxrwx 1 root root  9 May 21 20:22 scsi-36888603000008b32fa16688d09368506 -> ../../sda

Obtaining the Disk Device Name of a Xen Instance

  1. Obtain the disk information displayed on the console.

    1. Log in to the management console.
    2. Under Compute, click Elastic Cloud Server.
    3. Click the target ECS name in the ECS list.

      The page providing details about the ECS is displayed.

    4. Click the Disks tab and then to expand the disk information.
    5. Check the device name, type, and ID of the disk.
      • If the device type is VBD, go to 2.
      • If the device name is SCSI, go to 3.

      If Device Identifier is not displayed on the web page, stop the ECS and restart it.

  2. Check the device name of a VBD disk on the ECS.

    For a VBD disk, the device name displayed on the management console corresponds to the disk device name viewed on the ECS. For details, see Table 1.

    Table 1 Mapping between disk device names displayed on the management console and those obtained on the ECS

    Device Name (Management Console)

    Device Name (ECS)

    /dev/sd***

    /dev/xvd***

    /dev/vd***

    /dev/xvd***

    /dev/xvd***

    /dev/xvd***

    An example is provided as follows:

    If the device name displayed on the management console is /dev/sdb, the device name of the device attached to the ECS is /dev/xvdb.

  3. Check the device name of a SCSI disk on the ECS.

    1. Obtain the disk device ID.

      The device ID of the SCSI disk displays the disk WWN on the ECS.

    2. Log in to the ECS as user root.
    3. Run the following command to view the disk device name:

      ll /dev/disk/by-id |grep WWN|grep scsi-3

      [root@host-192-168-133-148 block]# ll /dev/disk/by-id/ |grep 6888603000008b32fa16688d09368506 |grep scsi-3
      lrwxrwxrwx 1 root root  9 May 21 20:22 scsi-36888603000008b32fa16688d09368506 -> ../../sda

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