下文簡(jiǎn)單介紹一個(gè)方法,實(shí)現(xiàn)不重新啟動(dòng)linux而可以識(shí)別到新增的磁盤.

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環(huán)境描述:
OS: Redhat linux 5.4 x86(主機(jī)為vmware 虛擬主機(jī))
增加一個(gè)50G的lun
方法一：

一. 手工增加磁盤的命令
# echo "scsi add-single-device w x y z" > /proc/scsi/scsi
為使該命令正常運(yùn)行，必須指定正確的參數(shù)值 w、x、y 和 z，如下所示：
w 是主機(jī)適配器標(biāo)識(shí)，第一個(gè)適配器為零(0)
x 是主機(jī)適配器上的 SCSI 通道，第一個(gè)通道為零(0)
y 是設(shè)備的 SCSI 標(biāo)識(shí)
z 是 LUN 號(hào)，第一個(gè) LUN 為零(0)

二. 執(zhí)行命令前,檢查/proc/scsi/scsi文件,確定新磁盤的id
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
可以看到大的id號(hào)為04,新增磁盤的ID應(yīng)該確定為5.

三. 執(zhí)行fdisk -l命令,檢查當(dāng)前磁盤的情況
[root@soadb scsi]# fdisk -l

Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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 2610 20860402+ 8e Linux LVM

......

Disk /dev/sde: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sde doesn't contain a valid partition table

四. 執(zhí)行命令
#echo "scsi add-single-device 0 0 5 0" >/proc/scsi/scsi

五. 執(zhí)行fdisk命令,檢查結(jié)果
[root@soadb scsi]# fdisk -l
......

Disk /dev/sde: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sde doesn't contain a valid partition table

Disk /dev/sdf: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdf doesn't contain a valid partition table

可以看到,新增的50G的磁盤已經(jīng)在操作系統(tǒng)中識(shí)別到,設(shè)備名稱為/dev/sdf.

此時(shí)就可以使用這個(gè)設(shè)備了.

方法二：
[root@localhost ~]# fdisk -l
Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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        2610    20860402+  8e  Linux LVM
[root@localhost ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@localhost ~]# fdisk -l
Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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        2610    20860402+  8e  Linux LVM
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
原博客地址：/tupian/20230522/uid-26557245-id-3307138.html
網(wǎng)站題目：不重新啟動(dòng)Linux,手工識(shí)別在線新增磁盤方法-創(chuàng)新互聯(lián)
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