/home on bcache (no LVM)
Once your fresh Fedora 20 system is running, we will "move" /home to a bcache device. To do this it's convenient to have a minimum amount of data on /home. Do the following steps:
- Open terminal
- Switch to root user:
- Install bcache tools:
yum install bcache-tools
- If needed "backup" all data in /home to another place on your root filesystem:
- comment /home out in your /etc/fstab
- unmount /home (which is on /dev/sda2)
- Make /dev/sda2 a bcache backing device: make-bcache -B /dev/sda2
- Make /dev/sdb1 a bcache caching device: make-bcache -C /dev/sdb1
- Note the set uuid and attach /dev/sdb1 to /dev/sda2: echo <set uuid> > /sys/block/bcache0/bcache/attach
How to test
Now you have a bcache device: /dev/bcache0
- use "bcache-status -s" to see details about your bcache device.
- create a filesystem: mkfs -t ext4 -L HOME /dev/bcache0
- create a /home entry in your /etc/fstab: LABEL=HOME /home ext4 defaults 1 2
- mount /home: mount -a
- If needed restore the /home backup you made earlier.
Now you have a system with /home on bcache.
- All steps completes without error
- reboot your system to see if it boots OK.
- do some other testing if you like. Limit the amount of data on /home or accept that it gets lost in the following steps.
In network tests I've used two IPs, em1 network interface. More details about them:
- 192.168.50.240 - free IP from my subnet
- 192.168.50.254 - default gw for my subnet
- em1 - name for ethernet interface