re-scan new disks without restarting CentOS

• re-scan new disks(/dev/sdc):

#ls /sys/class/scsi_host/host0  host1  host2[root@db210_13:56:14 /data]  #echo "- - -" > /sys/class/scsi_host/host0/scan[root@db210_13:57:57 /data]  #echo "- - -" > /sys/class/scsi_host/host1/scan[root@db210_13:57:57 /data]  #echo "- - -" > /sys/class/scsi_host/host2/scan[root@db210_13:57:58 /data]  #fdisk -lDisk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x00084df7   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *        2048     1026047      512000   83  Linux/dev/sda2         1026048     5222399     2098176   82  Linux swap / Solaris/dev/sda3         5222400    86259711    40518656   83  Linux/dev/sda4        86259712   125829119    19784704    5  Extended/dev/sda5        86261760   125829119    19783680   83  LinuxDisk /dev/sdb: 214.7 GB, 214748364800 bytes, 419430400 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x0e9c0acb   Device Boot      Start         End      Blocks   Id  System/dev/sdb1            2048   419430399   209714176   83  Linux**Disk /dev/sdc: 536.9 GB**, 536870912000 bytes, 1048576000 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes

• format disk

[root@db210_12:15:04 /backup] #fdisk /dev/sdcWelcome to fdisk (util-linux 2.23.2).Changes will remain in memory only, until you decide to write them.Be careful before using the write command.Device does not contain a recognized partition tableBuilding a new DOS disklabel with disk identifier 0xb4f30c82.Command (m for help): nPartition type:   p   primary (0 primary, 0 extended, 4 free)   e   extendedSelect (default p): pPartition number (1-4, default 1):First sector (2048-1048575999, default 2048):Using default value 2048Last sector, +sectors or +size{K,M,G} (2048-1048575999, default 1048575999):Using default value 1048575999Partition 1 of type Linux and of size 500 GiB is setCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.

• Create PV & VG& LV

[root@db210_12:15:23 /backup] #pvcreate /dev/sdc1  Physical volume "/dev/sdc1" successfully created.[root@db210_12:15:47 /backup] #pvs  PV         VG Fmt  Attr PSize    PFree    /dev/sdc1     lvm2 ---  <500.00g <500.00g#vgcreate MySQL /dev/sdc1  Volume group "MySQL" successfully created#vgs  VG    #PV #LV #SN Attr   VSize    VFree    MySQL   1   0   0 wz--n- <500.00g <500.00g#lvcreate -L499G MySQL  Logical volume "lvol0" created.

• Format LV and Mount the LV

[root@db210_12:21:52 /backup] #mkfs.xfs /dev/MySQL/lvol0meta-data=/dev/MySQL/lvol0       isize=256    agcount=4, agsize=32702464 blks         =                       sectsz=512   attr=2, projid32bit=1         =                       crc=0        finobt=0data     =                       bsize=4096   blocks=130809856, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=0log      =internal log           bsize=4096   blocks=63872, version=2         =                       sectsz=512   sunit=0 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0#mkdir /data2[root@db210_12:24:39 /backup] #mount /dev/MySQL/lvol0 /data2[root@db210_12:25:18 /data] #mv * /data2/

• show the mounted disk .

#df -hFilesystem               Size  Used Avail Use% Mounted on/dev/sda3                 39G   12G   28G  30% /devtmpfs                 3.9G     0  3.9G   0% /devtmpfs                    3.9G     0  3.9G   0% /dev/shmtmpfs                    3.9G  8.6M  3.9G   1% /runtmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup/dev/sda5                 19G   33M   19G   1% /home/dev/sdb1                200G   33M  200G   1% /data/dev/sda1                497M  119M  379M  24% /boottmpfs                    783M     0  783M   0% /run/user/0/dev/mapper/MySQL-lvol0  499G   44G  456G   9% /data2

• To make the mount persistent across reboots

vi /etc/fstab**********************************************************# /etc/fstab# Created by anaconda on Sat Jun 30 21:49:24 2018## Accessible filesystems, by reference, are maintained under '/dev/disk'# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info#UUID=4e617a1c-dcd5-4891-b649-a096e15371d9 /                       xfs     defaults        0 0UUID=202e21ef-c8f9-44b2-8fd0-e9dee6be5df8 /boot                   xfs     defaults        0 0UUID=f249e917-5db3-40e4-8738-c7c17077e8d5 /home                   xfs     defaults        0 0UUID=738f0097-2ef4-42b3-8782-f96fc3eaa95d swap                    swap    defaults        0 0/dev/mapper/MySQL-lvol0                   /data                   xfs     defaults        0 0