RHCSA Rapid Track

Your company's finance department has a logical volume called loans that is starting to run out of disk space, and you have been asked to extend it to 768MiB in size.

You have also been asked to create a new file system to host documents for the risk management team, part of the finance department; a 128MiB logical volume called risk has been agreed upon and it should be mounted on /finance/risk. Your company standard file system is XFS.

There is a volume group called finance used to hold the department's logical volumes, but unfortunately it has insufficient space to extend the existing logical volume and add the new one, so you have been allocated a further 512MiB from the current hard disk. The partition needs to be created.

When you are done, reboot your serverX machine, then run the command lab lvm grade from your serverX machine to verify your work.

1. Create a 512MiB partition on /dev/vdb, initialize it as a physical volume, and extend the finance volume group with it.

   1. Use fdisk to create the 512MiB partition and set it to type Linux LVM.

      [root@serverX ~]# fdisk /dev/vdb

      Note: The following steps omit some output.

   2. Add a new primary partition of 512MiB.

      Command (m for help): n
      Partition type:
         p   primary (1 primary, 0 extended, 3 free)
         e   extended
      Select (default p): Enter
      Partition number (2-4, default 2): Enter
      First sector (1050624-20971519, default 1050624): Enter
      Last sector, +sectors or +size{K,M,G} (1050624-20971519, default 20971519): +512M

   3. Change the partition type to Linux LVM - 0x8e.

      Command (m for help): t
      Partition number (1,2, default 2): Enter
      Hex code (type L to list all codes): 8e
      Changed type of partition 'Linux' to 'Linux LVM'

   4. Write the changes to the partition table and quit.

      Command (m for help): w
      The partition table has been altered!

   5. Use partprobe to register the new partition with the kernel.

      [root@serverX ~]# partprobe

   6. Use pvcreate to initialize the partition as a PV.

      [root@serverX ~]# pvcreate /dev/vdb2
        Physical volume "/dev/vdb2" successfully created

   7. Use vgextend to extend the VG named finance, using the new /dev/vdb2 PV.

      [root@serverX ~]# vgextend finance /dev/vdb2
        Volume group "finance" successfully extended

   Hide Solution

2. Extend the loans logical volume to 768MiB, including the file system.

   1. Use lvextend to extend the loans LV to 768MiB.

      [root@serverX ~]# lvextend -L 768M /dev/finance/loans
        Extending logical volume loans to 768.00 MiB
        Logical volume loans successfully resized

      Note

      Alternatively, you could have used -L +512M to resize the LV.

   2. Use xfs_growfs to extend the XFS file system to the remainder of the free space on the LV.

      [root@serverX ~]# xfs_growfs /finance/loans
      meta-data=/dev/mapper/finance-loans isize=256    agcount=4, agsize=16384 blks
      ...

      Note

      This example shows the xfs_growfs step to extend the file system. An alternative would have been to add the "-r" option to the lvextend command.

   Hide Solution

3. In the existing volume group, create a new logical volume called risk with a size of 128MiB. Add an XFS file system and mount it persistently on /finance/risk.

   1. Use lvcreate to create a 128MiB LV named risk from the finance VG.

      [root@serverX ~]# lvcreate -n risk -L 128M finance
        Logical volume "risk" created

   2. Use mkfs to place an xfs file system on the risk LV; use the LV device name.

      [root@serverX ~]# mkfs -t xfs /dev/finance/risk
      meta-data=/dev/finance/risk      isize=256    agcount=4, agsize=8192 blks
      ...

   3. Use mkdir to create a mount point at /finance/risk.

      [root@serverX ~]# mkdir /finance/risk

   4. Use vim to add the following line to the bottom of /etc/fstab on serverX:

      /dev/finance/risk  /finance/risk  xfs  defaults  1 2

   5. Use mount to verify the /etc/fstab entry and mount the new risk LV device.

      [root@serverX ~]# mount -a

   Hide Solution

4. When you are done, reboot your serverX machine, then run the command lab lvm grade from your serverX machine to verify your work.

   1. [root@serverX ~]$ systemctl reboot

   2. [student@serverX ~]$ lab lvm grade

   Hide Solution