On Sat, 28 Jun 2014 05:01:00 +0200 George Duffield <forumscollective@xxxxxxxxx> wrote: > >> > changing the value to 0.500: > >> > # echo 0.503 > /sys/block/md0/md/safe_mode_delay > >> > > >> > makes no difference to the array state. > > > > What if you write a smaller number? e.g. 0.1 > > No change to array state. > > > What does /sys/block/md0/md/array_state show? > > Funnily enough, it shows Clean Ahh - I found it. In get_array_info() in drivers/md/md.c: if (mddev->in_sync) info.state = (1<<MD_SB_CLEAN); if (mddev->bitmap && mddev->bitmap_info.offset) info.state = (1<<MD_SB_BITMAP_PRESENT); that last line should be "|=". Because you have a bitmap, the 'clean' state is being hidden. Though if you have a bitmap, the 'clean' state isn't really important because the bitmap knows which regions are 'clean' and which are not. But it should be fixed. I'll send a patch next week. Thanks for persisting. NeilBrown
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