Last year bought eight sas 2 t set a raid5 array has been using all have no problem to read and write also pretty good, but two days before the found when writing speed suddenly dropped to zero. The transmission speed about 30 seconds later reply. Has been in the two state repeatedly, thought Wan Zhao network problems at the beginning, later discovered a hard disk error, open among MSM in array is unlikely to processing for the first time, small white, so the post ask you this question how,