Add Second Disk To Linux VM

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Description:

Let’s say you need to attach a second disk to a linux VM with LVM setup, this is how you would do it on RHEL 7

To Resolve:

  1. Attach 70 GB Disk in vsphere by going to the VM – Hardware – Add New: Disk

  2. In the VM – we want to create the following file system:

    /files1  60 G
    /files2  150 G 
    /files3  300 G
    /files4  60 G
    
    • Scan SCSI to see new DISK
    echo "- - -" > /sys/class/scsi_host/host#/scan
    # OR
    echo "1" > /sys/class/scsi_disk/2:0:0:0/device/rescan
    # After scanning  you  should  see  new  disk  under  /dev/sd*
    ls /dev/sd*
    /dev/sda  /dev/sda1  /dev/sda2  /dev/sdb
    # This means that the first disk has two partitions - sda1 and sda2, but sdb is unpartitioned.
    # Likewise, you can run 'fdisk -l' to see your second disk
    
    • Create physical volume:
    pvcreate /dev/sdb
    
    • Create Volume Group:
    vgcreate FILES /dev/sdb
    
    • Next create the volumes
    lvcreate -L 60G -n /dev/mapper/FILES-u01 FILES
    lvcreate -L 150G -n /dev/mapper/FILES-u02 FILES
    lvcreate -L 300G -n /dev/mapper/FILES-u03 FILES
    lvcreate -L 60G -n /dev/mapper/FILES-u04 FILES
    # lvs or lvdisplay
    
    • Create new file system on volumes:
    mkfs.xfs /dev/mapper/FILES-u01
    mkfs.xfs /dev/mapper/FILES-u02
    mkfs.xfs /dev/mapper/FILES-u03
    mkfs.xfs /dev/mapper/FILES-u04
    
    • Create mountpoint:
    mkdir /files1
    mkdir /files2
    mkdir /files3
    mkdir /files4
    
    • Mount logical volume:
    mount /dev/mapper/FILES-u01 /files1
    mount /dev/mapper/FILES-u02 /files2
    mount /dev/mapper/FILES-u03 /files3
    mount /dev/mapper/FILES-u04 /files4
    # verify
    df -h /files4
    
    • Add to fstab for automount
    cp /etc/fstab /etc/fstab.bkp
    vi /etc/fstab
    # add
    /dev/mapper/FILES-u01 /files1         xfs             defaults        0 0
    /dev/mapper/FILES-u02 /files2         xfs             defaults        0 0
    /dev/mapper/FILES-u03 /files3         xfs             defaults        0 0
    /dev/mapper/FILES-u04 /files4         xfs             defaults        0 0
    
  3. reboot

  4. After reboot, run df -h  you should see the filesystem!

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