Hi, I've been willing to share an OCFS2 filesystem between several UML guests. For what it's worth, the host's device givent to uml is an iSCSI disc, seen by several hosts.
If I run the 2 guests on the same host, with no special option, it just fails because of a lock. If I use the 'c' (as "cluster"?) option to the ubd setup, still with the 2 guests on the same host, then it works fine. But running the 2 guests on the same host is not so good, as far as high-availablility is concerned. ;-) If I run the 2 guests on 2 different hosts, then each guest thinks it is the only one to access the filesystem. My guess is that OCFS2 uses some location in the file system for a heartbeat, and that because of some read caches on the host, each guest does not see the other guest's heartbeat... Then, if my guess is correct, opening the device with O_DIRECT would fix the problem, as it would avoid read caches. Do you think it would be worthy to add an option to the ubd setup to open the file/device with O_DIRECT? Cheers, Nicolas Boullis ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
