Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 07/08/15 02:09 PM, Fabio Gomes wrote:
> Recently I had a split-brain and all data created in last day
> disappeared on primary server, my servers are turned on at 6:00 am and
> turned off at 11:00 pm every day, what disappeared was only the data
> created in the last day before the split-brain, all other data still
> intact, the split-brain occurred at start up of the servers...
You can prevent this by using proper fencing/stonith. Without fencing,
split-brains are inevitable.
> I´m using Ubuntu 14.04 with drbd 8.4.3. Does anybody know what could
> happened ?
Any number of things, usually a network problem.
> Why my data has dissapeared ?
During a split-brain, data is being changed on both nodes independently.
To recover, you have to choose a node to discard the changes on so that
it can connect and sync with the peer.
> my configs are:
>
>
>
> global {
> usage-count yes;
> }
>
> common {
>
> protocol C;
>
> syncer {
> rate 100M;
Unless you have a 10 Gbps network, that is almost certainly way too
high. In DRBD 8.4, you don't need to set this, it will sort it out on
it's own based on current load.
> }
If you have pacemaker setup, configure stonith, test it to make sure it
works, then add;
handlers {
fence-peer "/path/to/crm-fence-peer.sh";
after-resync-target "/path/to/crm-unfence-peer.sh";
}
> }
>
>
> resource drbd0 {
>
> startup {
> become-primary-on srvnononas;
> wfc-timeout 180;
> }
>
> net {
> cram-hmac-alg sha1;
> shared-secret "senhadrbd";
> }
>
> syncer {
> verify-alg md5;
> }
>
> on srvnononas {
> device /dev/drbd0;
> disk /dev/sdb2;
> address 10.0.1.1:7788;
> meta-disk internal;
> }
>
> on shadownas {
> device /dev/drbd0;
> disk /dev/sdb2;
> address 10.0.1.2:7788;
> meta-disk internal;
> }
> }
>
>
> Thanks for the help,
> Fabio
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?