From: Kent Overstreet <kmo@daterainc.com>
To: Josep Lladonosa <jlladono@gmail.com>
Cc: "linux-bcache@vger.kernel.org" <linux-bcache@vger.kernel.org>
Subject: Re: About physically swapping backing and cache device
Date: Tue, 7 Jan 2014 13:35:58 -0800 [thread overview]
Message-ID: <20140107213558.GK9037@kmo> (raw)
In-Reply-To: <CAPBO7TYjki0s4-cMxS1ztvO=WT-8+ScH6mfZrE+YkTLuFcBqAA@mail.gmail.com>
On Tue, Jan 07, 2014 at 09:52:50AM +0100, Josep Lladonosa wrote:
> Hello,
>
>
> I have been using bcache for some months. Now I am with 3.12.6 kernel
> (stable! :)
> Thanks and congratulations for the good work.
>
> I have in the laptop this configuration:
>
> /dev/sda7 as backing device (hard drive partition)
> /dev/sdb as cache device (SSD)
>
> 1) I would like to physically swap sda and sdb (a matter of different
> bus speeds) in order to improve ata speed for SSD. The fact is that in
> a case of this, would I have to "reregister" anything in bcache, or it
> will run referenced to UUIDs and so?
Everything's referenced with UUIDs, so it'll all just work.
> 2) I think I would have to install GRUB into /dev/sdb (it has no
> partitions defined). Would it be safe installing GRUB in a cache
> device? Future configuration would be /dev/sda for the cache (SSD) and
> /dev/sdb for the backing device (hard drive).
Bcache doesn't touch the first 4k of the device, so if it's just grub's MBR (512
bytes) that should be fine. I would verify that grub isn't touching more than
the first 4k of the device though.
next prev parent reply other threads:[~2014-01-07 21:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-07 8:52 About physically swapping backing and cache device Josep Lladonosa
2014-01-07 21:35 ` Kent Overstreet [this message]
2014-01-07 23:07 ` Darrick J. Wong
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