Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> An information is saved in an hard disk1(primary) but another > harddisk2(secondary) has not synchronized for any reason... You mean Node1 and Node2. You use two machines for drbd, that implies two hard drives (each on separate computers), but the way you are stating it here, it seems like if you meant there were two hard drives in one machine which is not correct. > In another moment the harddisk1(now secondary) is sychonized with the > another hard disk2(now primary). Right? > But another information in the harddisk1 ? Be will it lost ? This is > common with drbd ? How solve this ? When you configured drbd (/etc/drbd.conf) you specified a protocol to be used on that resource. There are protocols A, B and C. If you are using protocol C (most secure for data integrity and recommended), then a write is not considered as commited, unless it was written to both primary and secondary nodes. So you should never loose any data if the two machines have healthy drbd connections. The only instances where you may loose data if you do not correct problems appropriately is when there is a split brain situation. When Node2 becomes primary and Node1 becomes secondary, any writes made on Node2 will be correctly propragated to Node1 if the drbd connections are still fine. If your Node1 is drbd secondary and you need to reboot it, change hardware, reinstall the OS, etc, then when you boot it back up it will first synchronize the data from Node2 (if all the drbd configuration is still correct - would be need some work if you reinstalled the OS). This is all handled by drbd. You can reboot the machine and take a look at the logs and you will see messages like: May 16 07:37:57 sauron kernel: drbd0: drbd0_receiver [3047]: cstate WFConnection --> WFReportParams May 16 07:37:57 sauron kernel: drbd0: Handshake successful: DRBD Network Protocol version 74 May 16 07:37:57 sauron kernel: drbd0: Connection established. May 16 07:37:57 sauron kernel: drbd0: I am(P): 1:00000002:00000002:00000055:0000000d:10 May 16 07:37:57 sauron kernel: drbd0: Peer(S): 1:00000002:00000002:00000054:0000000d:00 May 16 07:37:57 sauron kernel: drbd0: drbd0_receiver [3047]: cstate WFReportParams --> WFBitMapS May 16 07:37:57 sauron kernel: drbd1: drbd1_receiver [3055]: cstate WFConnection --> WFReportParams May 16 07:37:57 sauron kernel: drbd1: Handshake successful: DRBD Network Protocol version 74 May 16 07:37:57 sauron kernel: drbd1: Connection established. May 16 07:37:57 sauron kernel: drbd1: I am(P): 1:00000002:00000002:00000041:0000000a:10 May 16 07:37:57 sauron kernel: drbd1: Peer(S): 1:00000002:00000002:00000041:00000009:00 May 16 07:37:57 sauron kernel: drbd1: drbd1_receiver [3055]: cstate WFReportParams --> WFBitMapS May 16 07:37:58 sauron kernel: drbd1: Primary/Unknown --> Primary/Secondary May 16 07:37:58 sauron kernel: drbd1: drbd1_receiver [3055]: cstate WFBitMapS --> SyncSource May 16 07:37:58 sauron kernel: drbd1: Resync started as SyncSource (need to sync 1052680 KB [263170 bits set]). May 16 07:37:58 sauron kernel: drbd0: Primary/Unknown --> Primary/Secondary May 16 07:37:58 sauron kernel: drbd0: drbd0_receiver [3047]: cstate WFBitMapS --> SyncSource May 16 07:37:58 sauron kernel: drbd0: Resync started as SyncSource (need to sync 149756 KB [37439 bits set]). May 16 07:38:06 sauron kernel: drbd1: Primary/Secondary --> Secondary/Secondary May 16 07:38:07 sauron kernel: drbd1: Secondary/Secondary --> Secondary/Primary May 16 07:38:11 sauron kernel: drbd0: Resync done (total 13 sec; paused 0 sec; 11516 K/sec) May 16 07:38:11 sauron kernel: drbd0: drbd0_worker [19823]: cstate SyncSource --> Connected May 16 07:38:20 sauron kernel: drbd1: Resync done (total 22 sec; paused 0 sec; 47848 K/sec) May 16 07:38:20 sauron kernel: drbd1: drbd1_worker [19824]: cstate SyncSource --> Connected Hope this helps, Diego > > I wait for any help. > Sorry, forget my hard english. I hope that understand me. :) > Cya. > > > ------------------------------------------------------------------------ > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user