Hi I have 3 WD1002FAEX set as raid 5 and 2 WD6401AALS as raid 0.
When I do a drive test on them (using hdd tach) the average read rate is raid 0= 223 MB/S and the raid 5=127mb/s.
The problem I have is when I transfer files from the raid 0 to my storage drive raid 5 it starts off at 200mb/s and slowly makes its way down to a sustained 23mb/s.
Could this problem be due to the interfaces being different ie 3gb/s to 6gb/s?
The raid 5 is set as GUID format and the raid 0 as MBR format, could this cause the problem?
Note: I was running the caviar greens in raid 5 before i replaced them with the caviar black 1tb and it would sustain 80mb/s tranfers with the greens.
Thankyou. any help is much appriciated.
Just for reference:
WD1002FAEX = 1tb, 64mb cache, 6gb/s sata, caviar black.
WD6401AALS= 640mb, 32mb cache, 3gb/s sata, caviar black
i7 @ 4ghz
asus rampage ii extreme