On Wed, 18 Apr 2012 18:37:56 +0300 Alexander Lyakas <alex.bolshoy@xxxxxxxxx> wrote: > Hi Neil, > > > This could result in the shutdown happening when array is marked > > dirty, thus forcing a resync on reboot. However if you reboot > > without performing a "sync" first, you get to keep both halves. > Can you pls clarify the last statement? "If you break it, you get to keep both halves" is a colloquial phrase meaning that that the person saying it takes no responsibility for any damage that the person being spoken to causes. When applied to software issues it is ironic (because when a thing 'breaks' it doesn't result in two pieces like, for example, when a plate breaks) and so funny (I hope). (when applied to a RAID mirror, it is doubly ironic :-) If you force a fast shutdown without allowing a sync to happen (e.g. reboot -f -n) there could be data on the way out to the array when the system actually reboots, so the array will be dirty, so a resync will be required when the system restarts. This might be undesirable, but that isn't my problem and is not the problem of md/raid. Rather the cause of the problem is the "reboot -f -n". i.e. "your" problem. "You" broke it, you get to keep both halves. Does that help? NeilBrown
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