In VMware virtual machine (Linux), our Linux server may have multiple disks (or virtual disks), as shown below. The disks of this server include hard disk 1, hard disk 2 The hard disk 10 has a total of 10 hard disks.

In Linux system, the corresponding devices in the disk are as follows

[root@mylnx01 ~]# ls -lrt /dev/sd*

brw-r----- 1 root disk 8,   0 Apr 30 09:53 /dev/sda

brw-r----- 1 root disk 8,   3 Apr 30 09:53 /dev/sda3

brw-r----- 1 root disk 8,   2 Apr 30 09:53 /dev/sda2

brw-r----- 1 root disk 8,  21 Apr 30 09:53 /dev/sdb5

brw-r----- 1 root disk 8,  18 Apr 30 09:53 /dev/sdb2

brw-r----- 1 root disk 8,  17 Apr 30 09:53 /dev/sdb1

brw-r----- 1 root disk 8,  16 Apr 30 09:53 /dev/sdb

brw-r----- 1 root disk 8,  37 Apr 30 09:53 /dev/sdc5

brw-r----- 1 root disk 8,  34 Apr 30 09:53 /dev/sdc2

brw-r----- 1 root disk 8,  33 Apr 30 09:53 /dev/sdc1

brw-r----- 1 root disk 8,  32 Apr 30 09:53 /dev/sdc

brw-r----- 1 root disk 8,  64 Apr 30 09:53 /dev/sde

brw-r----- 1 root disk 8,  49 Apr 30 09:53 /dev/sdd1

brw-r----- 1 root disk 8,  48 Apr 30 09:53 /dev/sdd

brw-r----- 1 root disk 8,  82 Apr 30 09:53 /dev/sdf2

brw-r----- 1 root disk 8,  81 Apr 30 09:53 /dev/sdf1

brw-r----- 1 root disk 8,  80 Apr 30 09:53 /dev/sdf

brw-r----- 1 root disk 8,  69 Apr 30 09:53 /dev/sde5

brw-r----- 1 root disk 8,  65 Apr 30 09:53 /dev/sde1

brw-r----- 1 root disk 8, 113 Apr 30 09:53 /dev/sdh1

brw-r----- 1 root disk 8, 112 Apr 30 09:53 /dev/sdh

brw-r----- 1 root disk 8,  96 Apr 30 09:53 /dev/sdg

brw-r----- 1 root disk 8,  85 Apr 30 09:53 /dev/sdf5

brw-r----- 1 root disk 8, 129 Apr 30 09:53 /dev/sdi1

brw-r----- 1 root disk 8, 128 Apr 30 09:53 /dev/sdi

brw-r----- 1 root disk 8, 101 Apr 30 09:53 /dev/sdg5

brw-r----- 1 root disk 8,  97 Apr 30 09:53 /dev/sdg1

brw-r----- 1 root disk 8, 130 Apr 30 09:53 /dev/sdi2

brw-r----- 1 root disk 8, 147 Apr 30 09:53 /dev/sdj3

brw-r----- 1 root disk 8, 146 Apr 30 09:53 /dev/sdj2

brw-r----- 1 root disk 8, 145 Apr 30 09:53 /dev/sdj1

brw-r----- 1 root disk 8, 144 Apr 30 09:53 /dev/sdj

brw-r----- 1 root disk 8, 152 Apr 30 09:53 /dev/sdj8

brw-r----- 1 root disk 8, 151 Apr 30 09:53 /dev/sdj7

brw-r----- 1 root disk 8, 150 Apr 30 09:53 /dev/sdj6

brw-r----- 1 root disk 8, 149 Apr 30 09:53 /dev/sdj5

brw-r----- 1 root disk 8, 148 Apr 30 09:53 /dev/sdj4

brw-r----- 1 root disk 8, 153 Apr 30 09:53 /dev/sdj9

brw-r----- 1 root disk 8,   1 Apr 30 09:53 /dev/sda1

So how do we find out which disk / dev/sdj corresponds to in VMware? I believe that many students may want to judge by disk size, but this is not easy to judge or accurate by disk size, mainly due to the following factors:

1: The disk size is calculated differently on both sides. The disk size you see is a little different.

2: There may be disks of the same size. How do you judge at this time?

Is there a sign to judge it? According to the SCSI standard, each SCSI disk has a WWID, which is similar to the MAC address of the network card, and is unique. The / dev / disk / by ID directory on a Linux system contains the WWID access path for each SCSI disk.

[root@KerryDB ~]# ll /dev/disk/by-id/

total 0

lrwxrwxrwx. 1 root root  9 Apr 11 09:25 ata-ST500DM002-1BD142_Z6EA17FP -> ../../sda

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 ata-ST500DM002-1BD142_Z6EA17FP-part1 -> ../../sda1

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 ata-ST500DM002-1BD142_Z6EA17FP-part2 -> ../../sda2

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 ata-ST500DM002-1BD142_Z6EA17FP-part3 -> ../../sda3

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-name-centos-home -> ../../dm-2

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-name-centos-root -> ../../dm-0

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-name-centos-swap -> ../../dm-1

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-uuid-LVM-OoLL2Ne7hVrlu1rWFZRicmPrEZGxlZhQ2GwVhfhZrdLWmRZ3KuKGNJJqskLn2noy -> ../../dm-0

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-uuid-LVM-OoLL2Ne7hVrlu1rWFZRicmPrEZGxlZhQNALIUTdrhqV42RQNW8jaImopDuEPs5b3 -> ../../dm-1

lrwxrwxrwx. 1 root root 10 Mar 10 14:29 dm-uuid-LVM-OoLL2Ne7hVrlu1rWFZRicmPrEZGxlZhQybFeXSOtclTjcV0dS9tKiwA1IVBwxnrK -> ../../dm-2

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 lvm-pv-uuid-FAYN5y-YdiR-CywU-1vDf-Btz6-dkyt-TNy8ee -> ../../sda3

lrwxrwxrwx. 1 root root  9 Apr 11 09:25 wwn-0x5000c5007911cd0c -> ../../sda

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 wwn-0x5000c5007911cd0c-part1 -> ../../sda1

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 wwn-0x5000c5007911cd0c-part2 -> ../../sda2

lrwxrwxrwx. 1 root root 10 Apr 11 09:25 wwn-0x5000c5007911cd0c-part3 -> ../../sda3

But in the current environment, VMware virtual machine (Linux) does not turn on this option by default.

# ll /dev/disk/by-id

ls: /dev/disk/by-id: No such file or directory

# cd /dev/disk

# ls -lrt

total 0

drwxr-xr-x 2 root root  60 May  3 19:35 by-uuid

drwxr-xr-x 2 root root  60 May  3 19:35 by-label

drwxr-xr-x 2 root root 640 May  3 19:35 by-path

Moreover, if you connect VMware vSphere Client to VMware console, you will find that there is no WWID information of the hard disk. Even if you find the WWID information of the device in Linux, you can't see the corresponding WWID information in VMware console. We can also judge it by the SCSI number of the computer It can be applied to many devices (including random access devices, such as disks and sequential storage devices such as tape). As shown in the screenshot below, disks are managed by SCSI controller, and hard disk 9 corresponds to SCSI (0:11)

[root@mylnx01 ~]# ll /dev/disk/by-path | grep '0:11'

lrwxrwxrwx 1 root root  9 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0 -> ../../sdj

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part1 -> ../../sdj1

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part2 -> ../../sdj2

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part3 -> ../../sdj3

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part4 -> ../../sdj4

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part5 -> ../../sdj5

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part6 -> ../../sdj6

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part7 -> ../../sdj7

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part8 -> ../../sdj8

lrwxrwxrwx 1 root root 10 Apr 30 09:53 pci-0000:00:10.0-scsi-0:0:11:0-part9 -> ../../sdj9

[root@mylnx01 ~]# ls -l /dev/sdj*

brw-r----- 1 root disk 8, 144 Apr 30 09:53 /dev/sdj

brw-r----- 1 root disk 8, 145 Apr 30 09:53 /dev/sdj1

brw-r----- 1 root disk 8, 146 Apr 30 09:53 /dev/sdj2

brw-r----- 1 root disk 8, 147 Apr 30 09:53 /dev/sdj3

brw-r----- 1 root disk 8, 148 Apr 30 09:53 /dev/sdj4

brw-r----- 1 root disk 8, 149 Apr 30 09:53 /dev/sdj5

brw-r----- 1 root disk 8, 150 Apr 30 09:53 /dev/sdj6

brw-r----- 1 root disk 8, 151 Apr 30 09:53 /dev/sdj7

brw-r----- 1 root disk 8, 152 Apr 30 09:53 /dev/sdj8

brw-r----- 1 root disk 8, 153 Apr 30 09:53 /dev/sdj9

As shown above, we can judge that disk 9 corresponds to / dev/sdj under Linux through the output information of the above command.