Storage Shelf overview
The optional 2U12 8TB-based Storage Shelf is a 2U12 drive enclosure that contains twelve 8TB 7200 rpm SAS hard disk drives. Available storage capacity of the storage shelf is 65 TiB. A 2U12 20TB-based storage shelf offers 163 TiB of storage but this option is supported only with a configuration of six storage shelves. Each disk drive can be accessed from the storage shelf's front panel. The PCIe RAID controller is used to configure the disk drives into a RAID 6 configuration. One of the disk drives is reserved as a global hot spare and can be used in case of any drive failure.
The Storage Shelf also contains two Storage Bridge Bay 2.1 compliant (SBB) Input/Output (I/O) modules. Each I/O module has three mini-SAS HD ports, which are labeled A, B, and C. As such, each storage shelf contains a total of six mini-SAS HD I/O ports. However, only ports A and B of each I/O module are used to connect the storage shelf to the appliance or other storage shelves.
Each I/O module also includes one Ethernet port and a 3.5mm RS232 Interface-to-Enclosure Services Processor jack. The Ethernet port and the RS232 jack are only used during on-site debugging operations. They are not used during normal appliance operations.
Along with the I/O modules and the disk drives, the Storage Shelf also includes a front control panel. The control panel provides LED indications of the health of the storage shelf. It uses a dual seven segment display for enclosure identification and a switch that is used for storage shelf configuration purposes.
The Storage Shelf serial number appears on a plastic panel on the left side of Power Cooling Module 0 (PCM 0). The storage shelf serial number begins with the letters SH.
See Storage Shelf front panel components.