On 3 October 2013 11:04, John Ashford <logica...@hotmail.com> wrote: > 1 – Glusterfs V Ceph > > Im reading a lot of different opinions about which of these is the best > storage backend. My need is for a fully stable product that has fault > tolerance built in. It needs to support maybe 400 low traffic web sites and > a few very high traffic. I saw a Redhat diag suggesting throughput on a Gbit > nic with 2 storage servers (Glusterfs) would be around 200Mbps. I can put > quad nics in the 2 or 3 storage machines to give extra breathing room. > Gluster is of course a mature product and has Redhat pushing it forward but > some people complain of speed issues. Any real life experiences of > throughput using Ceph? I know Ceph is new but it seems there is considerable > weight behind its development so while some say its not production ready I > wonder if anyone has the experience to refute/concur?
CephFS is not production ready unlike with Ceph RBD. http://ceph.com/docs/master/architecture/ What do you really need? Distributed filesystem? Block devices? Object storage? This might be helpful: https://news.ycombinator.com/item?id=6359519 > 2 – vm instances on clustered storage > > Im reading how if you run your vm instances on gluster/ceph you benefit from > live migration and faster access times since disk access is usually to the > local disk. I just need to clarify this – and this may fully expose my > ignorance - but surely the instance runs on the compute node, not storage > node so I don’t get how people are claiming its faster running vm instance > on the storage cluster unless they are actually running compute on the > storage cluster in which case you don’t have proper separation of > compute/storage. Also, you would have the networking overhead unless running > a compute node on storage cluster? What am I missing?! Network (1Gbit) is faster then normal 7.2k SATA disk (considering RANDOM read/write) and is able to perform more IOPS. VM access files from storage cluster which can read/write them simultaneously from/to many disks in the cluster. At some point 10Gbit is a must. regards -- Maciej Gałkiewicz Shelly Cloud Sp. z o. o., Sysadmin http://shellycloud.com/, mac...@shellycloud.com KRS: 0000440358 REGON: 101504426 _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
