IBM 86655RY Hardware Maintenance Manual - Page 206
Understanding RAID level-1 Enhanced, RAID level-1E.
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Notice that the data on the drive on the right is a copy of the drive on the left. 1 1 2 2 3 3 4 4 With RAID level-1, if one of the physical drives fails, the ServeRAID controller switches read and write requests to the remaining functional drive in the RAID level1 array. Understanding RAID level-1 Enhanced: If you have three or more physical drives in the array, you cannot select RAID level-1; you can select RAID level-1 Enhanced (RAID level-1E). RAID level-1E combines mirroring with data striping. This RAID level stripes data and copies of the data across all of the drives in the array. As with the standard RAID level-1, the data is mirrored, and the capacity of the logical drive is 50 percent of the array capacity of the grouping of physical drives in the array. RAID level-1E requires a minimum of 3 drives and supports a maximum of 16 drives. The following illustration is an example of a RAID level-1E logical drive. Start with three physical drives. Create an array using the physical drives. 196 Hardware Maintenance Manual: Netfinity 7600 - Type 8665 Models 1RY, 2RY