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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.
http://en.wikipedia.org/wiki/Dynamic_Kernel_Module_Support
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.
Installation
------------
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 <graeme@sudo.ca>
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