Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tue, 06 Mar 2012 11:23:13 +0100, Felix Frank <ff at mpexnet.de> wrote: > On 03/06/2012 11:18 AM, Umarzuki Mochlis wrote: >> yes, the mailbox storages are LUN's on a SAN. it manages to do >> clustering with rgmanager + cman, so A3 would take where A1 or A2 left >> off by mounting A1's or A2's mailbox storage on itself since it is >> already running a standby mailbox service (zimbra-cluster standby >> server). i believe this is called 2+1 clustering. >> >> but now i have to setup another cluster for disaster recovery as i >> described before using drbd. >> >> is there anyway, with this setup that i could achieve what i had >> intended? Yes. You may use floating IP for DRBD and have one instance (IP) in site A and another in site B for each service. Do not use the service IP as floating IP as you will have problems moving the service from A to B. If A1 is active, you have the DRBD_A1 IP on that node, wich will move to A3 in case of failure before the service ... now you have DRBD_A1 and the service running on A3 over DRBD_A1, while DRBD_B1 will run undependable on B1 or B3. Now your A site goes down - you promote DRBD_B1 to primary and start A1 service on B1 over DRBD_B1. >> FYI, all hardware had been bought and storage had been calculated >> beforehand which i had no saying or part of. so this is a bit of a >> problem for me. > > Ah, I see now. > > Technically, you'd want establish DRBD synchronisation between the SAN > at your A site and the SAN at the B site. Manual failover would include > making SAN B Primary. > > Now, if said SANs are proprietary all-in-one products, your > possibilities for adding DRBD to it may be severely limited. > Your SAN vendor may or may not offer a cross-site synchronisation of > their own. If SAN vendor offers that, there is no need to use DRBD at all. > > HTH, > Felix > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user