1 显示当前磁盘分区：

  1. [root@centos7 ~]# fdisk -l
  2. Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
  3. Units = sectors of 1 * 512 = 512 bytes
  4. Sector size (logical/physical): 512 bytes / 512 bytes
  5. I/O size (minimum/optimal): 512 bytes / 512 bytes
  6. Disk label type: dos
  7. Disk identifier: 0x000a7835
  9.    Device Boot      Start         End      Blocks   Id  System
  10. /dev/sda1   *        2048     1026047      512000   83  Linux
  11. /dev/sda2         1026048    62914559    30944256   8e  Linux LVM
  13. Disk /dev/mapper/centos-root: 29.5 GB, 29490151424 bytes, 57597952 sectors
  14. Units = sectors of 1 * 512 = 512 bytes
  15. Sector size (logical/physical): 512 bytes / 512 bytes
  16. I/O size (minimum/optimal): 512 bytes / 512 bytes
  19. Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
  20. Units = sectors of 1 * 512 = 512 bytes
  21. Sector size (logical/physical): 512 bytes / 512 bytes
  22. I/O size (minimum/optimal): 512 bytes / 512 bytes
  24. [root@centos7 ~]# ls /sys/class/scsi_host/
  25. host0 host1 host2

2 重新扫描SCSI总线来添加设备

  1. [root@centos7 ~]# echo "- - -">/sys/class/scsi_host/host0/scan
  2. [root@centos7 ~]# echo "- - -">/sys/class/scsi_host/host1/scan
  3. [root@centos7 ~]# echo "- - -">/sys/class/scsi_host/host2/scan

3 验证磁盘和分区并确保20GB硬盘已经添加了

在本例中，出现了下面这行 “Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors” 并且可以确认没有重启服务器就添加了新盘：

  1. [root@centos7 ~]# fdisk -l
  2. Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
  3. Units = sectors of 1 * 512 = 512 bytes
  4. Sector size (logical/physical): 512 bytes / 512 bytes
  5. I/O size (minimum/optimal): 512 bytes / 512 bytes
  6. Disk label type: dos
  7. Disk identifier: 0x000a7835
  9.    Device Boot      Start         End      Blocks   Id  System
  10. /dev/sda1   *        2048     1026047      512000   83  Linux
  11. /dev/sda2         1026048    62914559    30944256   8e  Linux LVM
  13. Disk /dev/mapper/centos-root: 29.5 GB, 29490151424 bytes, 57597952 sectors
  14. Units = sectors of 1 * 512 = 512 bytes
  15. Sector size (logical/physical): 512 bytes / 512 bytes
  16. I/O size (minimum/optimal): 512 bytes / 512 bytes
  19. Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
  20. Units = sectors of 1 * 512 = 512 bytes
  21. Sector size (logical/physical): 512 bytes / 512 bytes
  22. I/O size (minimum/optimal): 512 bytes / 512 bytes
  25. Disk /dev/sdb: 8589 MB, 8589934592 bytes, 16777216 sectors
  26. Units = sectors of 1 * 512 = 512 bytes
  27. Sector size (logical/physical): 512 bytes / 512 bytes
  28. I/O size (minimum/optimal): 512 bytes / 512 bytes