Re: [Nbd] BCache with NBD is it possible?

[Juan Antonio Martinez <jantonio@...1345...>]

El lun, 24-02-2014 a las 09:59 -0500, Paul Clements escribió:
> It certainly should work. bcache is a generic block device cache. That
> said, I have not actually tried it with nbd, so maybe there's some bug
> preventing it from working?
> 
Well, AFAIK the main problem is that nbd real device is a file with an
in-built squashfs that resides in a remote server... 

That is: I can create my local cache device by mean of "make-bcache
-C /dev/sda1" but I cannot declare caching device by mean of
"make-bcache -B /dev/nbd0" because returns "device busy" error.... thus
cannot attach it to my local cache device . 

¿Any way to bypass this? Perhaps I'm missing something about how bcache
works... :-(

Thanks for your attention. Cheers
Juan Antonio

> On Mon, Feb 24, 2014 at 7:46 AM, Juan Antonio Martinez
> <jantonio@...1345...> wrote:
>         Hi all:
>         I have 250+ ubuntu 13.10 ltsp fat clients. As client hardware
>         is a "bit
>         obsolete" and don't want to buy extra memory for those
>         computers, we are
>         studying some configurations to improve performance.
>         
>         As on 13.10 BCache comes in the kernel mainline we'll want to
>         use local
>         client's disk as cache for nbd device.
>         
>         Is it possible? BCache documentation suggest it, but didn't
>         find any
>         tutorial/guide. Everything I got is a message like
>         "Device /dev/nbd0 is
>         not a partition, a logical volume or a LUKS volume" when using
>         "blocks
>         to-cache" commannd
>         
>         Thanks in advance
>         Juan Antonio
>         
>         
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