VMware虛拟機（Linux）中，我們的Linux伺服器可能擁有多個磁盤（或者叫虛拟磁盤），如下所示，這個伺服器的磁盤有硬碟1、硬碟2、…………硬碟10總共10塊硬碟。
而Linux系統中，磁盤中對應的裝置如下
[[email protected] ~]# 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
那麼我們如何找出/dev/sdj對應VMware中的哪個磁盤呢？ 相信很多同學可能想通過磁盤大小來判斷，但是呢，這個通過磁盤大小不好判斷或者判斷不精準，主要有下面一些因素：
1：兩邊計算磁盤大小的方式不一樣。看到的磁盤大小有點出入。
2：可能存在相同大小的磁盤，此時你怎麼判斷呢？
那麼有沒有通過某個辨別來判斷呢？根據SCSI标準，每個SCSI磁盤都有一個WWID，類似于網卡的MAC位址，而且是獨一無二。Linux系統上/dev/disk/by-id目錄包含每個SCSI磁盤WWID通路路徑。
[[email protected] ~]# 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
但是目前環境下，VMware虛拟機（Linux）預設情況下沒有開啟這個選項。
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
而且在VMware vSphere Client連上VMware控制台，你會發現這裡沒有提供硬碟的WWID資訊，即使你在Linux中找到裝置的WWID資訊，但是在VMware控制台也看不到對應的WWID資訊，我們還可以通過計算機的SCSI編号來判斷，SCSI 可适用于許多裝置（包括随機存取裝置，比如磁盤和像錄音帶這樣的順序儲存設備），如下截圖所示，磁盤有個顯示是通過SCSI控制器管理磁盤的，硬碟9對應的為SCSI（0:11）
[[email protected] ~]# 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
[[email protected] ~]# 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
如上所示，我們通過上面指令的輸出資訊就可以判斷磁盤9對應Linux下的/dev/sdj這個裝置。