• linux下不重启添加硬盘


    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, 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,磁盘增加成功

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  • 原文地址:https://www.cnblogs.com/wsl222000/p/4476703.html
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