IBM 86655RY Hardware Maintenance Manual - Page 205
Because the data is mirrored, the capacity of the logical drive when assigned RAID
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original data; the second half of a stripe is a mirror (that is, a copy) of the data, but written to the other drive in the RAID level-1 array. Because the data is mirrored, the capacity of the logical drive when assigned RAID level-1 is 50% of the array capacity. The following illustration shows an example of a RAID level-1 logical drive. Start with two physical drives. Create an array using the two physical drives. Then, create a logical drive within that array. The data is striped across the drives, creating blocks. Installing and configuring ServeRAID controllers 195
![](/manual_guide/products/ibm-866561y-hardware-maintenance-manual-c694d19/205.png)
Installing and configuring ServeRAID controllers
195
original data; the second half of a stripe is a
mirror
(that is, a copy) of the data, but
written to the other drive in the RAID level-1 array.
Because the data is mirrored, the capacity of the logical drive when assigned RAID
level-1 is 50% of the array capacity.
The following illustration shows an example of a RAID level-1 logical drive.
Start with two physical drives.
Create an array using the two physical drives.
Then, create a logical drive within that array.
The data is striped across the drives, creating blocks.