I am aware that RAID comes with certain write penalties, etc and that varies at different levels. I am trying to figure out how latency is affected in RAID 1. From my SAN, I can look at the number of writes, reads, bytes, and latency in individual HDD. While others match, latency slightly varies. I am trying to figure out the following.
RAID 1 HDD 1 Write Latency: 24ms HDD 2 Write Latency: 28ms
Does that mean the total write latency = 24ms + 28ms? Or just 28ms? or (24+28/2)ms. I am bound to believe it is 28ms because we are trying to find the max?