SMART issue with WDC RE

Hello,
i have a hp dl160 g6 with hp p410 256mb memory and my p410 firmware is 5.7
i have 2x 2TB Western Digital RE in Raid 1 Array right now when i execute
smartctl -a /dev/sda -d sat+cciss,0 it shows smart attribute but when i
execute smartctl -t short /dev/sda -d sat+cciss,0 or long test it says it
will finish X minutes but when i wait more than X minutes there is no self
tests log also i check self test log with smartctl -l selftest /dev/sda -d
sat+cciss,0
my host os is centos 6.8 64bit

any idea how solve this?
thanks,

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