Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Papp Tamás wrote: >> >> do not use skip-sync. >> >> it does not skip the initial sync, as you may have assumed, >> it does skip _any_ sync. >> this was meant as a debug tool in that time, and never to be used in any >> production environment. >> >> do not use skip-sync. >> never. >> > So there is now way to force a device to be synctarget or syncsource? Lars, I would be happy, if you write the best way to solve this problem. Until that I write, what worked to me. Problem: A drbd 0.7 cluster is in split-brain mode and both node was in Primary state. The BAD node wants to be SyncSource, even if its cstate is Secondary. Goal: sync bytes from GOOD node to BAD node. This behaviour can be seeing by setting '/drbdadm /dev/drbd0 syncer --skip-sync/' and plugging the cross cable: # /drbdsetup /dev/drbd0 syncer --skip-sync /Plug the cable:/ /# /cat /proc/drbd/ version: 0.7.22 (api:79/proto:74) SVN Revision: 2554 build by root at meta1, 2007-06-08 10:51:18 0: cs:*SkippedSyncS *st:*Secondary*/Primary ld:Consistent ns:0 nr:379684 dw:388896 dr:123304 al:964 bm:1221 lo:0 pe:0 ua:0 ap:0 Resolving: Primary (*BAD*) node change to Secondary: # /drbdsetup /dev/drbd0 secondary /Disconnect the cross cable (maybe here it's enough a /disconnect /command? Force *GOOD node *to be *SyncSource* (you can not do it with Secondary):/ / # drbdsetup /dev/drbd0 primary --human For safety set --skip-sync on both nodes (probably unnecessary?): # /drbdsetup /dev/drbd0 syncer --skip-sync /Plug the cross cable and you have to see something like that on the *BAD* node: # /cat /proc/drbd / version: 0.7.22 (api:79/proto:74) SVN Revision: 2554 build by root at meta1, 2007-06-08 10:51:18 0: cs:*SkippedSyncT *st:Secondary/Secondary ld:Consistent ns:0 nr:379684 dw:388896 dr:123304 al:964 bm:1221 lo:0 pe:0 ua:0 ap:0 You have the right direction. Disconnect nodes and set syncer back to normal behaviour: # /drbdsetup /dev/drbd0 disconnect/ # /drbdsetup /dev/drbd0 syncer/ Change *GOOD *node to be Primary: # drbdsetup /dev/drbd0 primary / /Connect nodes to start syncing:/ # drbdsetup /dev/drbd0 connect / Bye, tamas