On 2/10/2015 6:54 PM, Chris Murphy wrote: > Why I avoid swap on md raid 1/10 is because of the swap caveats listed > under man 4 md. Is possible for a page in memory to change between the > writes to the two md devices such that the mirrors are in fact > different. The man page only suggests this makes scrub check results > unreliable, and that such a difference wouldn't be read (?) But I > don't understand this. So I just avoid it because I haven't thoroughly > tested it. if its possible for that to happen, then the whole swapping AND mdraid mechanisms in linux are badly broken. -- john r pierce 37N 122W somewhere on the middle of the left coast