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List:       linux-bcache
Subject:    Re: How to check if one disk is SSD drive?
From:       Zhi Yong Wu <zwu.kernel-Re5JQEeQqe8AvxtiuMwx3w () public ! gmane ! org>
Date:       2012-06-13 1:38:59
Message-ID: CAEH94Lg8guj33EWFeHvFdX204Jzn=+D8nS__z1gAYgt7CyXBLw () mail ! gmail ! com
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On Tue, Jun 12, 2012 at 11:20 PM, Liang Guo \
<bluestonechina-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On Tue, Jun 12, 2012 at 7:04 PM, Zhi Yong Wu \
> <zwu.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > I don't use bcache now. To use bcache, I need rebuild the entire kernel.
> > > 
> > > I use flashcache instead, it can be compiled as a kernel model.
> > Sorry, I am bcache newbie, please execute me to ask one more question.
> > 
> > Just search flashcahce, it seems to have similar functions as bcache.
> > right? If so, what is the difference between flashcache and bcache? If
> > compared to flashcache, what are bcache's advantage and weakness
> > separately?
> > 
> As far as I know, both flashcache and bcache can use ssd as a cache device,
> flashcache can be compiled a kernel module, but bcache can only be patched
> in the kernel tree and be compiled with the entire kernel. If you are using a
> vender provided kernel, compiling as kernel module needs less work then
> compiling the entire kernel.
> 
> Bcache peoples are working hard to merge bcache into upstream kernel, once
> it enters to the upstream kernel, it will become a standard feature. and will be
> easy to use.
> 
> I have not do performance test. I don't know which one is better for
> your situation.
Great, thanks a lot.
> 
> BTW: If you want to use ssd as read cache, zfs[1][2] is a option too.
> 
> [1] http://zfs-fuse.net/
> [2] http://zfsonlinux.org/
> 
> 
> --
> Liang Guo
> http://bluestone.cublog.cn



-- 
Regards,

Zhi Yong Wu


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