mdadm sync check - completed percent

[oernii]

On my system mdadm runs periodic checks and while running the smtp agent will not work. This PR handles this case. These are my values:

cat /proc/mdstat

Personalities : [raid1] [raid6] [raid5] [raid4] md127 : active raid6 sdm1[8] sdj1[7] sdh1[6] sdf1[4] sdd1[2] sdg1[5] sdl1[9] sde1[3] sdb1[0] sdc1[1] 31255019520 blocks super 1.2 level 6, 128k chunk, algorithm 2 [10/10] [UUUUUUUUUU] [========>............] check = 40.4% (1579717248/3906877440) finish=2589.7min speed=14976K/sec bitmap: 1/30 pages [4KB], 65536KB chunk

cat /sys/block/md127/md/sync_completed

3159583488 / 7813754880

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