All my answers below: > 1. would you please share your hardware specs of Ceph storage cluster > and PVE Box and the connectivity of all boxes.
You can use legacy linux servers for Ceph Storage; of course, you can use cheap servers (ex: HP Microserver, with 4 sata disks) if you don't mind about performances; if you want performances, you can use 3 xeon based server, not less of 8Gbyte ram (16Gbyte is better), and several SAS disks for each server. For network connections, use 2/4 giga ethernet in a single bond. You can also use every kind of legacy linux server, or a virtual machine on each proxmox node, using 2 or more local disks (not used for other proxmox local storage), like Vmware does with VSA (virtual storage appliance); performances can be enough or not depending on your needs. > 2. do you relay upon only replication. dont you take the backup of > VM? if yes then again would you please throw some light on your > strategy in reference to my question in first message. Replication is never enough; you always need a backup with a retemption strategy; use another storage (a cheap soho nas with 2/4 sata disk in raid 1/10) > 3. Any recommended how to for ceph and PVE. You can find an howto on proxmox ve wiki, ( http://pve.proxmox.com/wiki/Storage:_Ceph ) and of course you can read on ceph home page. > 4. is your setup Ceph cluster is like DRBD active/passive with heart > beat. if one down second will auto up. with a second or 2 downtime? Replication on a clustered storage is something different; every "file" is splitted in several chunks (blocks) and every chunk is written on 2 or more servers (depending of replication level you need); so if one of the nodes of the ceph storage cluster dies (or if you need to reboot, change hardware, move location), the cluster can work in degraded mode (as a raid volume), but differently from raid, if you have 3 or more servers, and your replica goal is 2, the cluster begin to write the clusters with only 1 copy on the other servers; when your dead server can rejoin the cluster, it will be syncronized with every change... so always works like a charme. > Sorry for involving DRBD all the time since i have only worked on > DRBD clustering, only concept of mine in clustering starts and ends > on DRBD+heartbeat :) and as you also know that DRBD work little > differently and have some limitations too. so please dont mind. Is really different, and (for me) better. A storage cluster is not only redundant, but you can expand it lineary, with other server and/or disks, having more space (theoretically infinite space), more redundancy (if you change your replica goal from 2 to 3, for example), and more performance because you have more cpu, more disk, more IOPS. Regards, Fabrizio > > Thanks, > > > > > > > Regards, Fabrizio > > > > ----- Messaggio originale ----- > Da: "Muhammad Yousuf Khan" < [email protected] > > A: [email protected] > Inviato: Sabato, 5 ottobre 2013 10:58:41 > Oggetto: [PVE-User] efficient backup of VM on external storage. > > > > > > > > > > > > i have never worked on external storage just worked on drbd on local > storage/system drives. > > > Scenario is: > for example. i have two external storage and 1 Proxmox Machine. > i am using 1G NICs to connect all nodes > > the storage are connected to each other from another link but no > replication done b/w storage boxes mean they are no failover to each > other. and both the storage are connected to Proxmox. i am using > primary storage to run 3 machines on NFS or iSCSI. note that machine > are running on primary storage over a single 1G ethernet link/single > point of failure. > > > > now lets say. i want VM1 backedup to secondary storage. however i > dont want my backup traffic to effect my primary link where 3 > machines are active. > > > any suggestion to achieve that. > > > > > > Thanks. > > > _______________________________________________ > pve-user mailing list > [email protected] > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user > > -- > --- > Fabrizio Cuseo - mailto: [email protected] > Direzione Generale - Panservice InterNetWorking > Servizi Professionali per Internet ed il Networking > Panservice e' associata AIIP - RIPE Local Registry > Phone: +39 0773 410020 - Fax: +39 0773 470219 > http://www.panservice.it mailto: [email protected] > Numero verde nazionale: 800 901492 > > -- --- Fabrizio Cuseo - mailto:[email protected] Direzione Generale - Panservice InterNetWorking Servizi Professionali per Internet ed il Networking Panservice e' associata AIIP - RIPE Local Registry Phone: +39 0773 410020 - Fax: +39 0773 470219 http://www.panservice.it mailto:[email protected] Numero verde nazionale: 800 901492 _______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
