From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: [Qemu-devel] Re: [ANNOUNCE] Sheepdog: Distributed Storage System for KVM Date: Fri, 23 Oct 2009 19:05:32 +0200 Message-ID: <4AE1E25C.9010404@wpkg.org> References: <4ADE988B.2070303@lab.ntt.co.jp> <4AE07A7F.8000002@redhat.com> <8fd1d76d0910230341w7978ac09te203ef34b79a86c6@mail.gmail.com> <90eb1dc70910230714h65e918a4n255bcf97634b26b0@mail.gmail.com> <20091023145815.GE18955@arachsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Javier Guerra , MORITA Kazutaka , linux-fsdevel@vger.kernel.org, Avi Kivity , kvm@vger.kernel.org, qemu-devel@nongnu.org To: Chris Webb Return-path: In-Reply-To: <20091023145815.GE18955@arachsys.com> Sender: kvm-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Chris Webb wrote: > Javier Guerra writes: > >> i'd just want to add my '+1 votes' on both getting rid of JVM >> dependency and using block devices (usually LVM) instead of ext3/btrfs > > 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. Also, on _loaded_ systems, I noticed creating/removing logical volumes can take really long (several minutes); where allocating a file of a given size would just take a fraction of that. Sot sure how it would matter here, but probably it would. -- Tomasz Chmielewski http://wpkg.org