linux 虚拟机在线添加新磁盘

在线添加磁盘，扩展LVM卷案例

 

一、添加硬盘，在线扫描出来

首先到虚拟机那里添加一块硬盘，注意必须是SCSI类型的硬盘。

扫描硬盘，不用重启操作系统的。
echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -" > /sys/class/scsi_host/host1/scan
echo "- - -" > /sys/class/scsi_host/host2/scan
echo "- - -" > /sys/class/scsi_host/host3/scan
.......
echo "- - -" > /sys/class/scsi_host/hostn/scan

二、执行fdisk -l 查看扫描出来的新磁盘

root@ceph01:/# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders, total 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a19df

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758   104855551    52176897    5  Extended
/dev/sda5          501760   104855551    52176896   8e  Linux LVM

Disk /dev/mapper/ceph01--vg-root: 44.8 GB, 44807749632 bytes
255 heads, 63 sectors/track, 5447 cylinders, total 87515136 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ceph01--vg-root doesn't contain a valid partition table

Disk /dev/mapper/ceph01--vg-swap_1: 8585 MB, 8585740288 bytes
255 heads, 63 sectors/track, 1043 cylinders, total 16769024 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ceph01--vg-swap_1 doesn't contain a valid partition table

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table
root@ceph01:/#