[DRBD-user] come back to Primary/Secondary status

Andrés Cañada acanada at cnio.es
Thu Feb 16 12:43:14 CET 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Thankyou very much!
El Jueves, 16 de Febrero de 2006 12:17, Lars Ellenberg escribió:
> / 2006-02-16 11:04:57 +0100
>
> \ Andrés Cañada:
> > El Jueves, 16 de Febrero de 2006 10:55, Andrés Cañada escribió:
> > > Hi!
> > > Please, I need some help with this. Yesterday again the master director
> > > failover resources to backup director. Great (althougth it is crashing
> > > too many times)
> > > But now, when I want to come back to the old configuration I have some
> > > problems.
> > > I had to reboot primary director because it was frozen.
> > > So when heartbeat started again and with failback off, the backup
> > > director (now primary) shows in /proc/drbd:
> > > 	version: 0.7.15 (api:77/proto:74)
> > > 	SVN Revision: 2020 build by root at prot15, 2006-01-24 16:03:36
> > > 	 0: cs:StandAlone st:Primary/Unknown ld:Consistent
> > > 	    ns:0 nr:0 dw:4821556 dr:80335 al:188 bm:700 lo:0 pe:0 ua:0 ap:0
> > > 	 1: cs:Unconfigured
> > > And the old primary director, now secondary, shows:
> > > 	version: 0.7.15 (api:77/proto:74)
> > > 	SVN Revision: 2020 build by root at prot14, 2006-01-24 16:00:25
> > > 	 0: cs:WFConnection st:Secondary/Unknown ld:Consistent
> > > 	    ns:0 nr:0 dw:656 dr:55713 al:3 bm:260 lo:0 pe:0 ua:0 ap:0
> > > 	 1: cs:Unconfigured
> > >
> > > I'd like to have them in Primary/Secondary and Secondary/Primary status
> > > but I can't go back to that situation.
> > > Do I have to type #drbdadm syncer all (what I think it should
> > > synchronize the disks) to get them synchronized?? I can't with this
> > > command.
> >
> > 	Feb 16 10:59:21 localhost kernel: drbd0: Connection established.
> > 	Feb 16 10:59:21 localhost kernel: drbd0: I am(P):
> > 1:00000002:00000001:00000014:00000005:10 Feb 16 10:59:21 localhost
> > kernel: drbd0: Peer(S): 1:00000003:00000001:00000014:00000003:00
>
> I think here is one log line missing about "current primary shall become
> sync target. aborting to prevent data corruption"...
>
> I can not tell how you managed to get into this situation.
> but.
> you have to decide which one has the bad data, which has the good data.
>
> !! keep the box with the GOOD data in drbd primary mode !!
>
> go on the box with the BAD data,
> then "drbdadm invalidate" it.
>
> after that, you should be able to "drbdadm connect" them
> (probably has to be issued on both nodes).
> you will see a full sync.
>
> there are ways to avoid a full sync, but they are more involved.
> I'd go for the full sync.
>
> hope that helps.

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