bcache on ubuntu

bcache on ubuntu

[Giovanni Lenzi]

Hi,
I want to use bcache on ubuntu.

I saw that I have to download it from git with git clone command. Is it right?

I never recompiled a kernel. Is it so hard?

What kind of steps am I supposed to do, if I have a fresh ubuntu installation?

Thanks for any help.

Giovanni

Re: bcache on ubuntu

[Gabriel de Perthuis]

> Hi,
> I want to use bcache on ubuntu.
> 
> I saw that I have to download it from git with git clone command. Is it right?
> 
> I never recompiled a kernel. Is it so hard?
> 
> What kind of steps am I supposed to do, if I have a fresh ubuntu installation?

It's a bit early for this.

Before building a kernel, try your hand at building and installing bcache-tools.
Building the kernel is more time consuming, and you'll need bcache-tools
installed before the kernel so that it gets picked up for your boot.

Once that's done, have a look at https://wiki.ubuntu.com/KernelTeam/GitKernelBuild

Experimental 3.10 kernels will also appear sometime next week[1].  Assuming they
have bcache enabled, you don't really have to built it yourself, you just need to
deal with experimental releases and the chance of trouble.

That's enough to let you play with bcache.  Converting your installation to
bcache is not something I'd recommend to someone who has never done this sort of
hacking, because if the kernel turns out to be unstable you'll be stuck with it
to access your data.

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D

Re: bcache on ubuntu

[Giovanni Lenzi]

Ok thanks,
I think I will wait for the 3.10 on the link you provided..

Then, running it on my machine is just like copying the file like
"linux-image-3.9.1-030901-generic_3.9.1-030901.201305080210_amd64.deb"
into my existing /boot/ folder and letting grub to boot it, isn't it?

But what about the initrd image? It is not provided on your link... I
can take the old one I was booting? What is this image?

As you suggested, now I will try to build bcache-tools. But shouldn't
I compile it only when I'm running the new kernel?


Thanks very much.


On 11 May 2013 00:50, Gabriel de Perthuis <g2p.code-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> Hi,
>> I want to use bcache on ubuntu.
>>
>> I saw that I have to download it from git with git clone command. Is it right?
>>
>> I never recompiled a kernel. Is it so hard?
>>
>> What kind of steps am I supposed to do, if I have a fresh ubuntu installation?
>
> It's a bit early for this.
>
> Before building a kernel, try your hand at building and installing bcache-tools.
> Building the kernel is more time consuming, and you'll need bcache-tools
> installed before the kernel so that it gets picked up for your boot.
>
> Once that's done, have a look at https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
>
> Experimental 3.10 kernels will also appear sometime next week[1].  Assuming they
> have bcache enabled, you don't really have to built it yourself, you just need to
> deal with experimental releases and the chance of trouble.
>
> That's enough to let you play with bcache.  Converting your installation to
> bcache is not something I'd recommend to someone who has never done this sort of
> hacking, because if the kernel turns out to be unstable you'll be stuck with it
> to access your data.
>
> [1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D
>
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Re: bcache on ubuntu

[Gabriel de Perthuis]

> Ok thanks,
> I think I will wait for the 3.10 on the link you provided..
> 
> Then, running it on my machine is just like copying the file like
> "linux-image-3.9.1-030901-generic_3.9.1-030901.201305080210_amd64.deb"
> into my existing /boot/ folder and letting grub to boot it, isn't it?
> 
> But what about the initrd image? It is not provided on your link... I
> can take the old one I was booting? What is this image?
> 
> As you suggested, now I will try to build bcache-tools. But shouldn't
> I compile it only when I'm running the new kernel?

I did say:

you'll need bcache-tools installed *before* the kernel so that it gets
picked up for your boot.  So no.  This has to do with initramfs generation.

The wiki page I linked has the command for installing deb files.

If you hit any more snags, it will be a good idea to wait for things to
be properly integrated by Ubuntu.