Linux RedHat7 挂载空白磁盘

• 磁盘识别
  • 统计已挂载的磁盘的使用情况

  [root@localhost ~]# df -h
  Filesystem             Size  Used Avail Use% Mounted on
  /dev/mapper/rhel-root   64G   64G   20K 100% /
  devtmpfs                63G     0   63G   0% /dev
  tmpfs                   63G     0   63G   0% /dev/shm
  tmpfs                   63G   42M   63G   1% /run
  tmpfs                   63G     0   63G   0% /sys/fs/cgroup
  /dev/mapper/mpatha2    510M  128M  382M  26% /boot
  /dev/mapper/mpatha1    192M  9.5M  183M   5% /boot/efi
  tmpfs                   13G     0   13G   0% /run/user/0
  /dev/loop0             3.8G  3.8G     0 100% /mnt/cdrom
  

  • 由于大部分数据放在/opt下，并没有/opt的挂载点，看下/opt是属于哪个挂载点

  [root@localhost ~]# df /opt
  Filesystem            1K-blocks     Used Available Use% Mounted on
  /dev/mapper/rhel-root  66322800 66322780        20 100%  /
  

  • /挂载点的容量已经被用光了，加上新的磁盘，重启linux机器
  • 查看磁盘是否被识别

    [root@localhost ~]# fdisk -l
    WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
  
    Disk /dev/sda: 1600.3 GB, 1600321314816 bytes, 3125627568 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk label type: gpt
  
  
    #         Start          End    Size  Type            Name
     1         2048   3125626879    1.5T  unknown         
    WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
  
    Disk /dev/sdb: 85.9 GB, 85899345920 bytes, 167772160 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 16384 bytes / 16777216 bytes
    Disk label type: gpt
  
  
    #         Start          End    Size  Type            Name
     1        32768       425983    192M  EFI System      EFI System Partition
     2       425984      1474559    512M  Microsoft basic 
     3      1474560    167739391   79.3G  Linux LVM       
    fdisk: cannot open /dev/sdc: Input/output error
  

  • 已经看到一个1.5T的空白盘
• 挂载磁盘
  • 由fdisk -l 命令可知，新加的磁盘名称为/dev/sda
  • 在这里不进行分区，直接将整块磁盘格式化,挂载点为/data
  • 格式化为xfs文件系统

    [root@localhost ~]# mkfs.xfs -f /dev/sda
    meta-data=/dev/sda               isize=256    agcount=4, agsize=97675862 blks
             =                       sectsz=4096  attr=2, projid32bit=1
             =                       crc=0        finobt=0
    data     =                       bsize=4096   blocks=390703446, imaxpct=5
             =                       sunit=0      swidth=0 blks
    naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
    log      =internal log           bsize=4096   blocks=190773, version=2
             =                       sectsz=4096  sunit=1 blks, lazy-count=1
    realtime =none                   extsz=4096   blocks=0, rtextents=0
  

  • 挂载磁盘

    # 注意一定要有/data目录，没有就用mkdir创建一个，但是如果原来就有
    # /data目录下的数据一定要备份，要不然会丢失
    [root@localhost ~]# mount /dev/sda /data
  

  • 检查是否已经挂载上了

    [root@localhost ~]# df -h
    Filesystem             Size  Used Avail Use% Mounted on
    /dev/mapper/rhel-root   64G   64G   20K 100% /
    devtmpfs                63G     0   63G   0% /dev
    tmpfs                   63G     0   63G   0% /dev/shm
    tmpfs                   63G   42M   63G   1% /run
    tmpfs                   63G     0   63G   0% /sys/fs/cgroup
    /dev/mapper/mpatha2    510M  128M  382M  26% /boot
    /dev/mapper/mpatha1    192M  9.5M  183M   5% /boot/efi
    tmpfs                   13G     0   13G   0% /run/user/0
    /dev/loop0             3.8G  3.8G     0 100% /mnt/cdrom
    /dev/sda               1.5T   33M  1.5T   1% /data
  

  • 可以看到/data挂载点已经是1.5T了
• 使挂载永久生效

[root@localhost ~]# vi /etc/fstab 
/dev/mapper/rhel-root   /                       xfs     defaults        0 0
UUID=179fcfbf-cd9a-4659-8f9c-573abba4971f /boot                   xfs     defaults        0 0
UUID=39BB-EB15          /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/rhel-swap   swap                    swap    defaults        0 0
#添加下面这一行
/dev/sda                /data                   xfs     defaults        0 0

• 重启机器发现磁盘已经挂载到/data了