From: Javier Guerra <javier@guerrag.com>
To: Chris Webb <chris@arachsys.com>
Cc: linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org,
Avi Kivity <avi@redhat.com>,
MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>,
kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: [ANNOUNCE] Sheepdog: Distributed Storage System for KVM
Date: Fri, 23 Oct 2009 10:10:03 -0500 [thread overview]
Message-ID: <90eb1dc70910230810o5b86d14egec2b3514711c6bc4@mail.gmail.com> (raw)
In-Reply-To: <20091023145815.GE18955@arachsys.com>
On Fri, Oct 23, 2009 at 9:58 AM, Chris Webb <chris@arachsys.com> wrote:
> If the chunks into which the virtual drives are split are quite small (say
> the 64MB used by Hadoop), LVM may be a less appropriate choice. It doesn't
> support very large numbers of very small logical volumes very well.
absolutely. the 'nicest' way to do it would be to use a single block
device per sheep process, and do the splitting there.
it's an extra layer of code, and once you add non-naïve behavior for
deleting and fragmentation, you quickly approach filesystem-like
complexity.....
unless you can do some very clever mapping that reuses the consistent
hash algorithms to find not only which server(s) you want, but also
which chunk to hit.... the kind of things i'd love to code, but never
found the use for it.
i'll definitely dig deeper in the code.
--
Javier
next prev parent reply other threads:[~2009-10-23 15:10 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-21 5:13 [Qemu-devel] [ANNOUNCE] Sheepdog: Distributed Storage System for KVM MORITA Kazutaka
2009-10-21 8:28 ` [Qemu-devel] " Nikolai K. Bochev
2009-10-21 8:45 ` Nikolai K. Bochev
2009-10-23 9:59 ` MORITA Kazutaka
2009-10-21 9:08 ` [Qemu-devel] " Dietmar Maurer
2009-10-23 10:06 ` [Qemu-devel] " MORITA Kazutaka
2009-10-23 10:17 ` Chris Webb
2009-10-23 10:26 ` Chris Webb
2009-10-23 11:10 ` [Qemu-devel] " Dietmar Maurer
2009-10-23 11:45 ` Dietmar Maurer
2009-10-22 15:30 ` [Qemu-devel] " Avi Kivity
2009-10-22 16:28 ` Anthony Liguori
2009-10-22 22:09 ` Alexander Graf
2009-10-23 10:41 ` MORITA Kazutaka
2009-10-23 11:10 ` Alexander Graf
2009-10-23 16:17 ` MORITA Kazutaka
2009-10-23 14:14 ` Javier Guerra
2009-10-23 14:58 ` Chris Webb
2009-10-23 15:10 ` Javier Guerra [this message]
2009-10-23 17:05 ` Tomasz Chmielewski
2009-10-25 8:44 ` Dietmar Maurer
2009-10-25 10:55 ` Tomasz Chmielewski
2009-10-23 15:40 ` FUJITA Tomonori
2009-10-25 5:36 ` Avi Kivity
2009-10-25 8:51 ` [Qemu-devel] " Dietmar Maurer
2009-10-26 6:53 ` [Qemu-devel] " MORITA Kazutaka
2009-10-22 18:46 ` Avishay Traeger
2009-10-23 11:22 ` [Qemu-devel] " Dietmar Maurer
2009-10-23 19:39 ` [Qemu-devel] " MORITA Kazutaka
2009-10-23 19:45 ` Javier Guerra
2009-10-24 2:49 ` MORITA Kazutaka
2009-10-28 3:53 ` [Qemu-devel] " MORITA Kazutaka
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