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Revision as of 21:52, 9 October 2013 by Rolffokkens (talk | contribs)


/home on bcache (LVM)

Once your fresh Fedora 20 system is running, we will "move" /home to a Logical Volume (LVM) on a bcache device. Because of the flexibility that LVM provides the approach is quite different from page 1.A, for example we'll start by using sda4! Do the following steps:


  1. Open terminal
  2. Switch to root user: su -
  3. Install bcache tools: yum install bcache-tools
  4. Make /dev/sda4 a bcache backing device: make-bcache -B /dev/sda4
  5. Make /dev/sdb1 a bcache caching device: make-bcache -C /dev/sdb1
  6. Note the set uuid and attach /dev/sdb1 to /dev/sda2: echo <set uuid> > /sys/block/bcache0/bcache/attach

Now you have a bcache device: /dev/bcache0

How to test

  1. use "bcache-status -s" to see details about your bcache device.
  2. create a Physical Volume: pvcreate /dev/bcache0
  3. create a Volume Group: vgcreate BCACHE /dev/bcache0
  4. create a Logical Volume: lvcreate -L 2G -n HOME BCACHE
  5. create a filesystem: mkfs -t ext4 -L HOME /dev/BCACHE/HOME

This will be our new /home device. To use it first move the current /home to another mount point:

  1. replace /home entry in your /etc/fstab: LABEL=HOME /home ext4 defaults 1 2
  2. commands step by step:
    1. mkdir /home.old
    2. umount /home
    3. mount /dev/sda2 /home.old
    4. mount /home
    5. cp -ax /home.old/* /home
    6. umount /home.old
  1. build a new initramfs with dracut -N

Now you have a system with /home on LVM2 on bcache.

Expected Results

  1. All steps complete without errors
  2. reboot your system to see if it boots OK.
  3. do some other testing if you like.