QA:Testcase bcache-tools root on bcache (no LVM)

Description

This page describes a test case for bcache-tools, Bcache is a Linux kernel block layer cache. It allows one or more fast disk drives such as flash-based solid state drives (SSDs) to act as a cache for one or more slower hard disk drives. The bcache-tools package contains the utilities for manipulating bcache

Testing covers not only bcache-tools but also the interaction between bcache-tools and other packages: kernel, util-linux and dracut.

Starting with a stable F20 system with /home on LVM on bcache, we can go forward and have / on bcache. Consider thought that bcache is EXPERIMENTAL!

Prerequisites

This test requires the following test case as preparation: /home on bcache (no LVM)

The prerequisites for running the bcache-tools testcases can be found on this page

Setup

To get / on bcache we'll stop using /home on bcache first:

1. Open terminal
2. Switch to root user: su -
3. if needed make a bachup of /home on your root filesystem.
4. comment /home out in your /etc/fstab
5. unmount /home: umount /home
6. if needed restore your bachup to the /home directory

Now your /home is in your root filesystem. Next:

1. create a new filesystem on /dev/bcache0: mkfs -t ext4 -L ROOTFS /dev/bcache0
2. mount it: mount /dev/bcache0 /mnt
3. copy your current root filesystem to /mnt: cp -ax / /mnt
4. edit /mnt/fstab so your root fs is mounted like: LABEL=ROOTFS / ext4 defaults 1 1

Now we have a duplicate root filesystem on /dev/bcache0. To use it we need to build a new initramfs:

1. rename your current initramfs: mv /boot/initramfs...img /boot/initramfs...img.sav
2. build a new initramfs with dracut -N

Now reboot your system.

1. while in grub replace the root=UUID=... parameter in the "linux" line by: root=LABEL=ROOTFS
2. boot your system.

If all goes well, your system now boots fine and it's running on bcache!

1. Edit your /etc/grub2.cfg file..
2. .. duplicate the first "menuentry ... { ...}" (about 15 lines).
3. Now change the first one and replace the root=UUID=... parameter in the "linux" line by root=LABEL=ROOTFS
4. reboot again

How to test

1. reboot your system to see if it boots OK.
2. do some other testing if you like.

Expected Results

1. All steps complete without errors