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From: Robert W. <no...@ro...> - 2009-05-14 13:04:43
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On Tue, May 12, 2009 at 06:18:25AM -0700, CooLCaT@Vienna wrote: > > hi! > > thirst of all i must thank you all for your postings. > > let's begin from the start: > > i have a running master node with 2 partitions > > /dev/sda1 mounted as /boot > /dev/sda2 mounted as / > > let's forget about swap partition for now > > there are howtos for mirroring /dev/sda2 with the help of drbd to another > node Right. > if the master node goes done then the other takes over, as far as i > understood the whole thing. > i havent had time yet to play with the drbd solution. Thats the scope of drbd. > but what happends if the second node goes also down? > the cluster becomes unavailable. Right. > so we thought of using a nfs share instead of /dev/sda2 > > so the master node boots up and instead of using /dev/sda2 as / filesystem > it uses a > nfs share. the next node boots from it's hard disk, finds the masternode an > continues as usual > > we tought of using openfiler as nfs server, because openfiler includes also > failover to a second > openfiler installation. Hm. Lets see: you do not trust your 2 openSSI-master nodes, so you want a solution, where every node of your cluster could take over the master role, and you rely therefore on a 2-node-fileserver for the root file system? Is your openfiler file server so much more reliable than your 2 openSSI master nodes? Maybe it could be cheeper to invest the money for the openfiler-system into some more reliable HW for your OpenSSI-nodes??? What are your requirements (in uptime, costs, etc) for your system? What is the probability for a failure of your 2 openSSi master nodes _at_the_same_time_? (Because I guess, if one server fails, then you will nearly immediately repair or substitute your failed server ...) > the goal is, that every node can become a failover node, not even only two > nodes which are mirrored via drbd. Relying on a (only) two node file server ;-)) Regards, Robert (PS: I am not really an expert, but if you like, then we could discuss this stuff also privately in german ...) |
