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.
Assuming you have a 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.
Prerequisites
The prerequisites for running the bcache-tools testcases can be found on this page
Setup
- Open terminal
- Switch to root user:
su - - 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)
How to test
- 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
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 applicable restore the /home backup you made earlier.
Now you have a system with /home on bcache.
- reboot your system to see if it boots OK.
- do some other tests generation I/O on /home if you like.
Expected Results
- All steps complete without errors