Purpose of having mirror positions is to highlight your devices protection levels. Prior to V-MAX, most devices occupied 2 mirror positions initially unless they were standalone devices, leaving 2 mirror positions available for Local and Remote replication options as there is a maximum of 4 mirror positions. With the introduction of the V-MAX we see RVA (Raid Virtual Architecture) whereby only 1 mirror position is initially occupied by the device, regardless of whether it is Mirrored,RAID5,RAID6 , freeing up an additional mirror position for local and remote replication options, not that all local replication methods require a mirror position. Hope this explains.
What exactly is the role of the mirror positions in a sym dev ?
Can someone please expalain the mirror positions of a sym dev ?