Greetings ... 2009/9/18 Majed B. <majedb@xxxxxxxxx>: > For what it's worth, I use XFS on one of my arrays, and whenever > mounting it, I get this error: > > [ 2212.567725] Filesystem "dm-0": Disabling barriers, trial barrier write failed > > So I guess you could use XFS to run your tests. I saw this meesage today, and remember both this thread and that on my CentOS 5.4, which I have moved a RAID5/ext4 filesystem from a Fedora 10 ... I'm getting these reports in my message log ... Sep 19 14:59:52 zeus kernel: JBD: barrier-based sync failed on md5 - disabling barriers Sep 19 15:06:12 zeus kernel: EXT4-fs: barriers enabled Would this help with testing? >>>>> >>>>> It seems like what you'd need to robustly test barriers is some sort of >>>>> barrier-supporting loopback device, which >>>>> acted correctly with barriers, but had worst-case behavior without them >>>>> (buffering things for random arbitrarily long periods of time, >>>>> performing all operations in random order, etc). Best of luck ... Thanks Mailed LeeT -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
