The Dell R720 and R730 platforms have eight hard drive bays. Both platforms ship with four 300GB, 15K, SAS hard drives that are configured as a RAID 10 array. This array provides approximately 550 GB of disk space. To scale the appliances for ATP 3.x, four additional hard drives are installed and configured as a second RAID 10 array. These extra hard drives are added to the four empty hard drive slots of the R720 and R730.
In addition to the SAS drives, the Dell R730 also ships with a 400GB SSD in a fifth bay. Before you upgrade the appliance, the SSD must be removed. See the R730 owner's manual for instructions to access and remove the SSD.
The new array uses four 1.8TB, 10K, SAS drives. The available space of the volume after RAID 10 configuration is approximately 3.3TB. After scaling, the physical appliance has two RAID 10 arrays: the original as-shipped RAID 10 array (with ~ 550GB), and the additional 3.3 TB RAID 10 array, for a total of ~3.8 TB.
To install the drives, follow the instructions that are provided in the Dell owner's manual for the appliance.
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