vmware虚拟机（linux）中，我们的linux服务器可能拥有多个磁盘（或者叫虚拟磁盘），如下所示，这个服务器的磁盘有硬盘1、硬盘2、…………硬盘10总共10块硬盘。
而linux系统中，磁盘中对应的设备如下
[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
那么我们如何找出/dev/sdj对应vmware中的哪个磁盘呢？ 相信很多同学可能想通过磁盘大小来判断，但是呢，这个通过磁盘大小不好判断或者判断不精准，主要有下面一些因素：
1：两边计算磁盘大小的方式不一样。看到的磁盘大小有点出入。
2：可能存在相同大小的磁盘，此时你怎么判断呢？
那么有没有通过某个标识来判断呢？根据scsi标准，每个scsi磁盘都有一个wwid，类似于网卡的mac地址，而且是独一无二。linux系统上/dev/disk/by-id目录包含每个scsi磁盘wwid访问路径。
[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
但是当前环境下，vmware虚拟机（linux）默认情况下没有开启这个选项。
# 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连上vmware控制台，你会发现这里没有提供硬盘的wwid信息，即使你在linux中找到设备的wwid信息，但是在vmware控制台也看不到对应的wwid信息，我们还可以通过计算机的scsi编号来判断，scsi 可适用于许多设备（包括随机存取设备，比如磁盘和像磁带这样的顺序存储设备），如下截图所示，磁盘有个显示是通过scsi控制器管理磁盘的，硬盘9对应的为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
如上所示，我们通过上面命令的输出信息就可以判断磁盘9对应linux下的/dev/sdj这个设备。
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