On Tue, 5 May 2009, Chris Mason wrote: > For ext3, mount -o barrier=1 and you should see something exciting. It > won't BUG because ext3 isn't as serious about telling the users about IO > problems as we are, but you should at least see messages. With that option, ext3 gives a waring, yes: [ 1743.370971] JBD: barrier-based sync failed on xvdc - disabling barriers Ext4 seems to enable barriers right away and when I actually write to the filesystem, it emits a warning indeed: # umount /mnt/d2 [...] [ 1409.043735] JBD: barrier-based sync failed on xvdc:8 - disabling barriers [ 1413.700390] EXT4-fs: mballoc: 1531 blocks 46 reqs (24 success) [ 1413.700406] EXT4-fs: mballoc: 23 extents scanned, 1 goal hits, 23 2^N hits, 0 breaks, 0 lost [ 1413.700415] EXT4-fs: mballoc: 2 generated and it took 4884 [ 1413.700421] EXT4-fs: mballoc: 1212 preallocated, 690 discarded I still find the BUG somehow...misleading. An error message seems to be more appropriate. Christian. -- The universe was created to serve as Bruce Schneier's crib text. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
