Ibm - 12 Bay System Storage Exp3512 Storage Expansion Unit Model E2a Storage Enclosure. 
 General: 
device Type : Storage Enclosure 
enclosure Type : Rack-mountable - 2u 
 Cabinet (chassis): 
installed Devices / Modules Qty : 0 
supported Devices / Modules Qty : 12 
supported Drives : Serial Attached Scsi 2 
 Hard Drive: 
type : Hot-swap - Plug-in Module 
capacity : 0 
 Expansion / Connectivity: 
expansion Bays Total (free) : 12 ( 12 ) X Hot-swap - 3.5 Lff 
interfaces : 1 X Serial Attached Scsi 2 - 26 Pin 4x Shielded Mini Multilane Sas (sff-8088) 2 X Serial Attached Scsi 2 - 26 Pin 4x Shielded Mini Multilane Sas (sff-8088) 
 Power: 
power Device : 2 X Power Supply - Hot-plug - Plug-in Module 
max Supported Qty : 2 
power Redundancy : Yes 
power Redundancy Scheme : 1+1 
voltage Required : Ac 120/230 V ( 50/60 Hz ) 
power Provided : 585 Watt 
 Dimensions & Weight: 
width : 17.7 In 
depth : 21.3 In 
height: 3.4 In 
weight: 20lbs