Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Helmut Wollmersdorfer wrote: > 1) DRBD is a _two_ node cluster > 2) You cannot mount the DRBD-device in Secondary state > > What's possible in your case: > > A) split /home > node3 node1 node2 > home1 Primary Secondary unconfigured > home2 Primary unconfigured Secondary Yes - this is the setup I was planning. node1 and node2 hold different data. So the clustering is between node1/node3, node2/node3. [..] > The advantage of sync utilities like rsync/unison on file or content > level is, that there is no restriction in direction or mounting. > > The disadvantage is, that rsync cannot sync continiously. If you start > it e.g. by cron each hour, data changes of the last hour can be lost. In > case of read only webpages, your users maybe can live with this risk. > > For web-forums, wikis, web-shops etc., where updates happen often, I > would prefer DRBD. Yes - not to forget mail servering. Unfortunately drbd won't work for me atm. I'll use mysql replication for the DB data and I will have to deal with the potential data loss of ~1hr for everything on disk. rsync has another disandavantage - it's consumes much CPU power on checking for updates. I tried this once and I had massive load peaks. But - again I there is no other way to go for now. cheers -- Daniel Khan CTO [::] webCLUSTER.at Ebretsteiner & Khan OEG Kornstrasse 10 4060 Leonding Tel: +43 (0) 732 37 09 60 | Fax: +43 (0) 732 37 09 60 10 http://www.webcluster.at | support at webcluster.at