Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tue, Nov 17, 2009 at 12:50 PM, Lars Ellenberg <lars.ellenberg at linbit.com> wrote: > > No. You did not understand. > > It is not a question of performance. > Or whether a write reached all *nodes*. > > In your setup, it is technically *impossible* > for a write to reach all lower level *disks*. > Can you give a brief explanation of why that is the case? > again, your fancy cool and whatever setup won't work. > DO NOT DO THIS. > Is the problem the dual path? What if a single path was used in some stacked configuration where a drbd is used as a backing device for another drbd share? > A sure way to data corruption. > > Got me this time? > > ;) > > So by all means: use one iSCSI on DRBD cluster, > and have any number of ocfs2 clients via iSCSI. > Or double check if NFS can do the trick for you. > We have three geographically independent locations that have to share data, but still remain independent. iSCSI is an interesting idea since it exposes a block device. But, I could ask the same silly question I'm asking now about drbd: is it possible to come up with some clever way to do a 3-node config? Or, will it run into the same technical limitations that you say drbd has? I'm almost better off synchronizing with manually with rsync than using iSCSI or NFS in the more conventional sense. I mean, currently, we do a pretty simple two node DRBD config, but it'd be nice to add in a third. > again, your fancy cool and whatever setup won't work. > DO NOT DO THIS. > The question really is whether this is a desirable configuration? If so, what technical limitations have to be overcome to make something like this work. -- Jiann-Ming Su "I have to decide between two equally frightening options. If I wanted to do that, I'd vote." --Duckman "The system's broke, Hank. The election baby has peed in the bath water. You got to throw 'em both out." --Dale Gribble "Those who vote decide nothing. Those who count the votes decide everything.” --Joseph Stalin