HI All: In our case, we use drbd to sync oracle db data in two node across the wan. Since the net bandwidth is slow(<2M), the i/o performance is pretty poor in primary node because i/o operation will be pending to wait the data transmission. So we have considered the following solution: On secondary node, run disconnect and connect command in sequence . Diconnect drbd0 , wait 5 minutes (or longer time), connect drbd0 again, and after sync complete , disconnect drbd0 again. But we are wondering the follow issues:
1. How can we confirm that each sychorinzation after connecting is a quick sync and not a full sync? And how to tune it to be that. 2. the secondary node disconnect drbd0 only when the cstate is Connected and dstate is UptoDate. Can the data integration of db data be guaranteed? In other words, If the primary node crash at this moment, the oracle db can be started on the secondary node? And in quich sync , Is the data written on secondary node in the same order as it written on primary node ? 3. is the activity log size tuning helpful for this situation? _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
