CentOS 6.8不重启在线增加硬盘

ytutr

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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[iyunv@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

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

1 2	[iyunv@dbackup ~]# ls /sys/class/scsi_host/ host0

这里只有一个host0

2.重新扫描scsi总线来添加设备

1	[iyunv@dbackup host0]# echo "- - -" > /sys/class/scsi_host/host0/scan

3.查看硬盘

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[iyunv@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

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

1 2	[iyunv@backup ~]# ls /sys/class/scsi_host/ host0 host1 host2

三个总线，这需要逐个去重新扫描

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[iyunv@backup ~]# echo "- - -" > /sys/class/scsi_host/host0/scan [iyunv@backup ~]# echo "- - -" > /sys/class/scsi_host/host1/scan [iyunv@backup ~]# echo "- - -" > /sys/class/scsi_host/host2/scan

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