Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Sep 12, 2007 at 11:40:36AM +0200, philippe wrote: > Hi > > I have experienced a data loss with drbd with this steps : > > 2 nodes with drbd synchronised providing nfsd > > node 1 active > > node 1 shutdown > > node 2 takeover > > so far all is ok > > node 1 stay down for 3 weeks > > node 2 is shutdown > [A] > node 1 is started > -> here node 1 become primary with data 3 weeks old. [B] > node 2 is started > -> node 2 become secondary and all current data are overwritted with > 3 weeks old data. > > > Is there a way for node 2 to refuse synchronisation with older data ? no. the error/mistake happened [A]. you should not go online with outdated data. with DRBD 8, at [B] we are able to detect diverging data sets, bable about "split brain detected" and refuse to connect, (or do whatever you configured it to do, e.g. automatically throw away one of the data sets and resync anyways) still, even if it had refused to connect, you'd need to then sort out the divergence. -- : Lars Ellenberg Tel +43-1-8178292-0 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Vivenotgasse 48, A-1120 Vienna/Europe http://www.linbit.com : __ please use the "List-Reply" function of your email client.