On Sun, 11 Mar 2012 02:33:34 +0400 George Shuklin <george.shuklin@xxxxxxxxx> wrote: > Good day. > > I've look to stat for all MD devices I have (raid0, raid1, raid10) - all > of them reports 0 for time_in_queue field in /sys/block/mdX/stat file. > > Is any reason why all raid devices contains no information about time > spent on requests processing? > Wrong mailing list for MD - you want linux-raid@xxxxxxxxxxxxxxx But I can still answer : These raid levels don't queue requests at all. They just pass them straight to the relevant underlying devices. (Now admittedly RAID5 does queue requests but doesn't set the time_in_queue field, but that is a separate issue). If you really care about time_in_queue, you need to look at the queues of the member devices. NeilBrown
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