linux下不重启加硬盘

linux下热加载磁盘

临时给虚拟机加了一块硬盘，增长后懒得重启，因而看了看热加载

[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，咱们主要依据这行作热加载

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号默认状况都是0

热增长一个磁盘很简单：
echo "scsi add-single-device x y z u"> /proc/scsi/scsi
这里，咱们是单机，显然，x y u都是固定的，只有scsi id是不一样的
因此只须要
echo "scsi add-single-device 0 0 1 0"> /proc/scsi/scsi
就能够增长磁盘
下面来测试一下：

 [root@centos5 ~]# fdisk -l 
Disk /dev/sda: 107.3 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14         535     4192965   82  Linux swap / Solaris
/dev/sda3             536       13054   100558867+  83  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, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14         535     4192965   82  Linux swap / Solaris
/dev/sda3             536       13054   100558867+  83  Linux

Disk /dev/sdb: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table
[root@centos5 ~]# 

ok，磁盘增长成功