Christian Kujau wrote: > I was using "sync" to make sure that the data "should" be on the disks
Good, but not good enough for many tests... info sync CONFORMING TO POSIX.2 NOTES On Linux, sync is only guaranteed to schedule the dirty blocks for writing; it can actually take a short time before all the blocks are finally written. This is consistent with all the feels-like-unix OSes I have used. And to make it even more random, the hardware (drive/controller) write cache state needs to be accounted for, and what the filesystem does if anything to try to ensure device-cache-to-media consistency. That does not mean I'm saying the tests are invalid or not useful, only that people need to evaluate "what do they really tell me". jim -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html