有的时候因为硬盘空间不够，需要在线增加硬盘，有的时候因为无法识别就可能需要重启服务器。
这里介绍一下服务器在不重启的情况下，增加硬盘操作。
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[root@dbackup ~]
# fdisk -l
Disk
/dev/sda
: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors
/track
, 5221 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 5221 41833260 8e Linux LVM
Disk
/dev/sdb
: 193.2 GB, 193273528320 bytes
255 heads, 63 sectors
/track
, 23497 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/sdb
doesn't contain a valid partition table
Disk
/dev/dm-0
: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors
/track
, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-0
doesn't contain a valid partition table
Disk
/dev/dm-1
: 209.2 GB, 209278992384 bytes
255 heads, 63 sectors
/track
, 25443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-1
doesn't contain a valid partition table
Disk
/dev/dm-2
: 4294 MB, 4294967296 bytes
255 heads, 63 sectors
/track
, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-2
doesn't contain a valid partition table
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我硬盘里已经有2块硬盘，但是我刚才又增加了一块，有3块硬盘。
这里无法找到新的/dev/sdc
1.确定磁盘的总线号
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[root@dbackup ~]
# ls /sys/class/scsi_host/
host0
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这里只有一个host0
2.重新扫描scsi总线来添加设备
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[root@dbackup host0]
# echo "- - -" > /sys/class/scsi_host/host0/scan
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3.查看硬盘
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[root@dbackup79 host0]
# fdisk -l
Disk
/dev/sda
: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors
/track
, 5221 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 5221 41833260 8e Linux LVM
Disk
/dev/sdb
: 193.2 GB, 193273528320 bytes
255 heads, 63 sectors
/track
, 23497 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/sdb
doesn't contain a valid partition table
Disk
/dev/dm-0
: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors
/track
, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-0
doesn't contain a valid partition table
Disk
/dev/dm-1
: 209.2 GB, 209278992384 bytes
255 heads, 63 sectors
/track
, 25443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-1
doesn't contain a valid partition table
Disk
/dev/dm-2
: 4294 MB, 4294967296 bytes
255 heads, 63 sectors
/track
, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/dm-2
doesn't contain a valid partition table
Disk
/dev/sdc
: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors
/track
, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk
/dev/sdc
doesn't contain a valid partition table
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多了一个sdc，下面就可以进行分区了。
说明：
以上可能会出现如
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[root@backup ~]
# ls /sys/class/scsi_host/
host0 host1 host2
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三个总线，这需要逐个去重新扫描
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[root@backup ~]
# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@backup ~]
# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@backup ~]
# echo "- - -" > /sys/class/scsi_host/host2/scan
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或者如果你的环境不是scsi磁盘(sas/sata也属于scsi)，则扫描的可能就是scsi_host了
本文转自 rong341233 51CTO博客，原文链接:http://blog.51cto.com/fengwan/1844341
