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From: John H. <jo...@Ca...> - 2009-05-12 13:56:20
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CooLCaT@Vienna wrote: > let's forget about swap partition for now > (every node has it's own swap) > there are howtos for mirroring /dev/sda2 with the help of drbd to another > node > > 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. > > but what happends if the second node goes also down? > the cluster becomes unavailable. > True. > 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. > And what happens if the second openfiler node goes down? > the goal is, that every node can become a failover node, not even only two > nodes which are mirrored via drbd. > Then you realy need every node to have physical access to the root filesystem. But make sure that you're not just replacing the two init nodes by two fileserver nodes - that doesn't gain you much. I'd think about FC or iSCSI for a setup like this. But how probable is it that both init nodes would go down? > i think due to my bad english, that there were some missunderstandings > regarding the access to the filesystem. i hope i cleared it out a little bit > now. > Your English is very good. |
