On Tue, 16 Mar 2010 14:32:55 -0700 Justin Maggard <jmaggard10@xxxxxxxxx> wrote: > I've noticed on recent kernels that /sys/block/md?/md/sync_completed > seems to rarely get updated. What is the expected update interval? > For me, it seems to only update about once every 6% or so during the > resync. Of course, /proc/mdstat has the actual current progress. The expected update time is every 6% - actually 1/16 which is 6.25%. sync_completed includes a guarantee that all blocks before this point really have been processed. The number in /proc/mdstat is less precise. The much of the array has been resynced, but due to the possibility of out-of-order completion of writes they may not be a contiguous series of blocks. Providing the guarantee (which is needed for externally-managed metadata) requires briefly stalling the resync, so I didn't want to do it more often. I could possibly make it time-bases instead of size-based though. Is this a problem for you? NeilBrown -- 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
