On Wed, Jun 9, 2010 at 5:06 PM, Maurice Volaski <maurice.vola...@einstein.yu.edu> wrote: >> Are you sure of that? This directly contradicts what David Magda said >> yesterday. > > Yes. Just how is what he said contradictory?
To quote from his message: > Either the primary node OR the secondary node can have active writes > to a volume, but NOT BOTH at the same time. Once the secondary > becomes active, and has made changes, you have to replicate the > changes back to the primary. Here's a good (though dated) demo of > the basic functionality: > > http://hub.opensolaris.org/bin/view/Project+avs/Demos > > The reverse replication is in Part 2, but I recommend watching them in > order for proper context. For making the secondary send data to the primary: > >> -r >> >> Reverses the direction of the synchronization so the primary volume is >> synchronized from the secondary volume. [...] >> >> http://docs.sun.com/app/docs/doc/819-2240/sndradm-1m >From your message: > However, a critical difference is that after the primary fails and the > secondary > takes over, you won't have a mirror until you bring the primary completely > back > online as the primary. You can't make it the secondary temporarily. DRBD can > trivially reverse the roles on the fly, so you can run the secondary as a > primary > and primary as the secondary and the mirroring works in reverse automatically. Maybe there is another way to read those, but it looks to me like David says you can trivially swap the roles of the nodes using the '-r' switch (and he provides a link to the documentation), and you say that you can't trivially swap the roles of the nodes. [...] >> > Unfortunately, there are no simple, easy to implement heartbeat >> mechanisms >>> >>> for Solaris. >> >> Not so. Sun/Solaris Cluster is (fairly) simple and (relatively) easy >> to implement and it will handle all of the requirements that Moazam > > To be fair, I didn't actually try it, but, for one thing, though I might be > wrong, it must be compiled manually to work with developer builds. Rather, > ironically, perhaps, I cobbled together some bash scripts that perform basic > heartbeat functionality. I pretty much stick with the production release Solaris, not developer builds. No compilation is necessary for Cluster on Solaris. It's a fairly straight forward pkg install and a few configuration commands. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
