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List: nbd-general
Subject: Re: [Nbd] BCache with NBD is it possible?
From: Juan Antonio Martinez <jantonio () dit ! upm ! es>
Date: 2014-02-25 8:30:09
Message-ID: 1393317009.26501.10.camel () jonsy
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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@dit.upm.es> 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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