d6e4d65 Sep 20, 2011
49 lines (38 sloc) 2.03 KB
DKMS Module Howto:
A number of modern distros (Ubuntu, Fedora and others) can use DKMS to help sensibly manage building
and maintaining additional third party kernel modules.
I've added some simple DKMS configs for flashcache to make building and managing it a little less painful.
This has been updated with a Makefile.dkms, which should hopefully do a sensible DKMS install without
intervention. Right now requires initramfs-tools for boot support, so it probably won't work on CentOS 5
just yet.
Ubuntu (and probably Debian):
- Install prerequisite build packages:
apt-get install dkms build-essential linux-headers-`uname -r`
CentOS/RHEL 5:
- Follow the steps in README-CentOS5 to prep for building on CentOS.
Run "make -f Makefile.dkms", and it should build and install correctly for your kernel.
Boot from Flashcache
If you have initramfs-tools, then flashcache utils and modules can be installed into the initramfs.
- Follow Installation section above.
- Install flashcache boot support:
make -f Makefile.dkms boot_conf
- Edit your /etc/fstab and /boot/grub/grub.cfg to change the root device to the flashcache device you intend to use.
(ex: /dev/mapper/fc-root)
- Boot off a live CD like the Ubuntu desktop installer.
- Mount your root device (mount /dev/root-partition /mnt)
- cd to your flashcache source directory, and install flashcache into the boot environment. (make install)
- Unmount your root device (umount /mnt)
- Create flashcache device backed by your root device. I recommend using the UUID path in case device renaming occurs:
flashcache_create -p back fc-root /dev/ssd_device /dev/disk/by-uuid/root_device_uuid
- Reboot!
Known Issues:
- Right now grub-probe fails to detect the underlying root device when booting off flashcache,
so you'll have to edit /boot/grub/grub.cfg manually.
- Because of previous point, update-grub will likely fail.
Graeme Humphries <>