Separate HDD test using RAID controller
I am using Red Hat 220.127.116.11 with RAID 6 controller (card).
(When I use "cat /proc/partitions" I do not see the separate HDDs in the RAID, I see one drive for the RAID itself, as it is considered 1 large drive.)
I used a "dd" check to test my RAID drive speed and found it was a bit slow, so I want to figure out which HDD in the RAID is problematic.
I was wondering I there was a way within Red Hat to test the HDDs separately without destroying the RAID build.
Otherwise is there a 3rd party tool that can help me?
Thanks in advance for any help possible.
This is my first post so I don't know exactly what information is needed, please tell me if you need more information in order to help me (and as I am new to Red Hat I would also appreciate explanations on how to get it).