linux下热加载磁盘
临时给虚拟机加了一块硬盘，增加后懒得重启，于是看了看热加载
[root@centos5 ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: VMware, Model: VMware Virtual S Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
#注意红色字体这行，我们主要依据这行做热加载 scsi0 为x <- 是硬盘或者磁带机所在SCSI控制器号
Channel 为y <-是硬盘或者磁带机所在SCSI通道的编号
id 为z <-是硬盘或者磁带机的SCSI ID号
lun 为u <-是硬盘或者磁带机的lun号默认情况都是0 热增加一个磁盘很简单：
echo "scsi add-single-device x y z u"> /proc/scsi/scsi
这里，我们是单机，显然，x y u都是固定的，只有scsi id是不同的
所以只需要
echo "scsi add-single-device 0 0 1 0"> /proc/scsi/scsi
就可以增加磁盘
下面来测试一下：
[root@centos5 ~]# fdisk -l
Disk /dev/sda: 107.3 GB, bytes
heads, sectors/track, cylinders
Units = cylinders of * = bytes Device Boot Start End Blocks Id System
/dev/sda1 * Linux
/dev/sda2 Linux swap / Solaris
/dev/sda3 + Linux
只看到一个磁盘
执行命令看看：
[root@centos5 ~]# echo "scsi add-single-device 0 0 1 0"> /proc/scsi/scsi
[root@centos5 ~]# fdisk -l Disk /dev/sda: 107.3 GB, bytes
heads, sectors/track, cylinders
Units = cylinders of * = bytes Device Boot Start End Blocks Id System
/dev/sda1 * Linux
/dev/sda2 Linux swap / Solaris
/dev/sda3 + Linux Disk /dev/sdb: 128.8 GB, bytes
heads, sectors/track, cylinders
Units = cylinders of * = bytes Disk /dev/sdb doesn't contain a valid partition table
[root@centos5 ~]#
ok，磁盘增加成功