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- Description
- Specifications
The 1812-81A is the IBM System Storage DS4000 EXP810 Storage Expansion Unit. It is a 3U rack-mountable enclosure with 16 bays for enhanced disk drive modules (E-DDMs), and a fully populated unit with 300 GB Fibre Channel E-DDMs gives 4.8 TB of capacity. It ships with two 4 Gbps shortwave small form-factor pluggable transceivers for connecting to the DS4000 storage server.
It attaches to the DS4300, DS4500, DS4700 and DS4800. A switch on the front sets the link rate for the whole enclosure to either 2 Gbps or 4 Gbps, never both, and 2 Gbps and 4 Gbps drives cannot be mixed in the same enclosure; a 2 Gbps drive in a 4 Gbps enclosure is not recognized.
The enclosure has two ESM boards for redundancy. Each ESM has four SFP ports, of which only the two near the centre (1A and 1B) are used and 2A and 2B are reserved. Each E-DDM has a green in-place/activity LED and an amber identification LED.
IBM warns that EXP810 and EXP710 drive modules are not interchangeable, and that the minimum number of drive modules must be installed before the unit is powered up. A separate -48 V DC EXP810 model for Telco power exists with NEBS-3 compliance.
More IBM disk expansion is under storage systems.
| 1812-81A Specs | |
| Machine type and model | 1812-81A |
| IBM name | System Storage DS4000 EXP810 Storage Expansion Unit |
| Form factor | 3U rack-mount |
| Drive bays | 16 E-DDM |
| Capacity with 300 GB drives | 4.8 TB |
| Link rate | 2 or 4 Gbps Fibre Channel, front selector switch |
| Transceivers | two 4 Gbps shortwave SFPs included |
| Attaches to | DS4300, DS4500, DS4700, DS4800 |
| Controllers | two ESM boards |