Sure I could look at writing up a howto for gluster. It is pretty straight forward.
As for the other questions; yes I am using XFS as the underlying filesystem for gluster. For KVM, I love it. I haven't really noticed any significant issues, what are these issues regarding HA and snapshotting? In 4.1 I haven't had any issues creating a snapshot of a KVM VM, turning it into a template, and launching it again. Live migration seems to work pretty good as well on KVM, however, I haven't tested failing KVM nodes yet to see how CloudStack deals with the outage... I assume that it will just restart the VM on an available KVM node in the cluster. ----- Original Message ----- From: "Chiradeep Vittal" <chiradeep.vit...@citrix.com> To: users@cloudstack.apache.org Sent: Thursday, September 12, 2013 11:25:49 AM Subject: Re: Cloustack 4.1.0 + GlusterFS John, care to write a HOWTO use GlusterFS in the wiki? On 9/11/13 5:27 PM, "John Skinner" <john.skin...@appcore.com> wrote: >I ran each test independently for each block size. > >iozone -I -i 0 -i 1 -i 2 -r 4k -s 1G > >In order: -I to specify direct-IO, -i 0 to specify write/rewrite, -i 1 to >specify read/re-read, -i 2 to specify random read/write, -r specify block >size, -s to specify file size. > >The report is pretty thorough. What I put in the email was different, I >just took the throughput from each test and put it into a table outside >of the full report. > >----- Original Message ----- > >From: "Rafael Weingartner" <rafaelweingart...@gmail.com> >To: users@cloudstack.apache.org >Sent: Wednesday, September 11, 2013 4:16:23 PM >Subject: Re: Cloustack 4.1.0 + GlusterFS > >I have never used iozone before, > >How did you get that report? > >I tried: iozone -s 1024m -t 1 -R > >But the report was pretty different from yours. > > >2013/9/11 John Skinner <john.skin...@appcore.com> > >> I currently have GlusterFS deployed into an 8 node KVM cluster running >>on >> CloudStack 4.1 for primary storage. Gluster is deployed on 28 1TB >>drives >> across 2 separate storage appliances using a distributed-replicated >>volume >> with the replica set to 2. The storage network is 10Gb copper. >> >> These are the options I have configured for the volume in Gluster, most >>of >> them are from a Red Hat document on configuring Red Hat Enterprise >>Storage >> for VM hosting: >> >> >> >> performance.io-thread-count: 32 >> performance.cache-size: 1024MB >> performance.write-behind-window-size: 5MB >> performance.write-behind: on >> network.remote-dio: on >> cluster.eager-lock: enable >> performance.stat-prefetch: off >> performance.io-cache: on >> performance.read-ahead: on >> performance.quick-read: on >> >> Here are some of the numbers I was getting when benchmarking the >>storage >> from the KVM node directly (not a VM) >> >> The below table is in KB/s. The test is single stream 1GB file >>utilizing >> Direct I/O (no cache). I used iozone to run the benchmark. >> >> Write 4k 45729 >> Read 4k 10189 >> Random Write 4k 31983 >> Random Read 4k 9859 >> Write 16k 182246 >> Read 16k 37146 >> Random Write 16k 113026 >> Random Read 16k 37237 >> Write 64k 420908 >> Read 64k 125315 >> Random Write 64k 383848 >> Random Read 64k 125218 >> Write 256k 567501 >> Read 256k 218413 >> Random Write 256k 508650 >> Random Read 256k 229117 >> >> In the above results, I have the volume mounted to each KVM host as a >>FUSE >> glusterfs file system. They are added to CloudStack as a shared mount >> point. In the future it would be great to utilize GlusterFS qemu >>libvirt >> integration with libgfapi so I could bypass fuse altogether. However, >>that >> would require adding that code to CloudStack to support that. >> >> I maybe have 15 or so VMs running from the storage now and it is still >> pretty snappy. Need to do some more testing though and really get it >>loaded. >> >> ----- Original Message ----- > >> >> From: "Rafael Weingartner" <rafaelweingart...@gmail.com> >> To: users@cloudstack.apache.org >> Sent: Wednesday, September 11, 2013 8:48:07 AM >> Subject: Re: Cloustack 4.1.0 + GlusterFS >> >> Right now I can think in three main reasons: >> >> The first reason, performance (I do not know Gluster and its >>performance >> and if the read and write speed are satisfactory). Please if you can >>make a >> test, post the results. >> >> Second consistency, I do not know Gluster, but swift that is also a >> Distributed File System is not consistency and they make it pretty >>clear on >> their page (http://docs.openstack.org/developer/swift/) >> >> "Swift is a highly available, distributed, eventually consistent >> object/blob store...". >> >> I would not accept to storage my VMs images on a FS that is eventually >> consistent. >> >> Third, network, I haven't used this kind of FS, but I can image that it >> uses a lot of bandwidth to keep synchronizing, managing and securing >>the >> data. So, managing the networking would be a pain. >> >> >> >> 2013/9/11 Olivier Mauras <oliv...@core-hosting.net> >> >> > >> > >> > Hi, >> > >> > Those thinking that it's not a good idea, do you mind >> > explaining your point of view? >> > GlusterFS seems like the only real >> > alternative to a highly priced SAN for the primary storage... >> > >> > >> > Thanks, >> > Olivier >> > >> > On 2013-09-11 15:08, Rafael Weingartner wrote: >> > >> > > I >> > totally agree with Tomasz, I do not think that using a distributed FS >> > as >> > > primary storage is a good idea, but as a secondary it sounds >> > interesting. >> > > >> > > But, off course you can try *;*) >> > > >> > > 2013/9/11 >> > Shanker Balan <shanker.ba...@shapeblue.com> >> > > >> > >> On 11-Sep-2013, at >> > 5:14 PM, Tomasz Zięba <t.a.zi...@gmail.com [1]> wrote: >> > >> >> > >>> Hi, Some >> > time ago I tried to use GlusterFS as storage for cloudstacka but I >> > noticed that cloudstack uses the default settings for mount command. >>By >> > default mount command is using the UDP protocol but glusterfs works >> > >> >> > only >> > >> >> > >>> using tcp. I think, if cloudstack developers could add "-o >> > proto=tcp" to code glusterfs should works. For example: /bin/mount -t >> > nfs -o proto=tcp IP:/share /mnt/gluster/ If you are using CitrixXen >>you >> > should mount the share and make it as SR. For cloudstacka is clear >> > because you should use the option PreSetup when creating >>PrimaryStorage. >> > Personally, I doubt that using GlusterFS as a primary storage is a >>good >> > solution but for secondary storage it should be very usefull. >> > >> And >> > maybe as a Swift backend. -- @shankerbalan M: +91 98860 60539 | O: >>+91 >> > (80) 67935867 shanker.ba...@shapeblue.com [2] | www.shapeblue.com [3] >>| >> > Twitter:@shapeblue ShapeBlue Services India LLP, 22nd floor, Unit >>2201A, >> > World Trade Centre, Bangalore - 560 055 This email and any >>attachments >> > to it may be confidential and are intended solely for the use of the >> > individual to whom it is addressed. Any views or opinions expressed >>are >> > solely those of the author and do not necessarily represent those of >> > Shape Blue Ltd or related companies. If you are not the intended >> > recipient of this email, you must neither take any action based upon >>its >> > contents, nor copy or show it to anyone. Please contact the sender if >> > you believe you have received this email in error. Shape Blue Ltd is >>a >> > company incorporated in England & Wales. ShapeBlue Services India LLP >>is >> > operated under license from Shape Blue Ltd. ShapeBlue is a registered >> > trademark. >> > > >> > > -- Rafael Weingartner >> > >> > >> > >> > Links: >> > ------ >> > [1] >> > mailto:t.a.zi...@gmail.com >> > [2] mailto:shanker.ba...@shapeblue.com >> > [3] >> > http://www.shapeblue.com >> > >> >> >> >> -- >> Rafael Weingartner >> >> > > >-- >Rafael Weingartner >
