This Drobo B1200i is in fantastic shape and has actually been a terrific unit for us for the last year. We've outgrown the ability and needed to move up to a bigger SAN. This device features 9 of the 2TB Constellation ES SAS and 3 of the 200GB OCZ SSD SAS drives imagined. The addition of the SSD drives allows the Drobo's Automated Data-Aware Tiering.

　　Here are a couple useful links:

　　http://drobo.wpengine.netdna-cdn.com/downloads/products/0520_B1200i_DS.pdf

　　/downloads/white-papers/WP-0109-00_adat-technology.pdf

　　Here are the specs:

　　Connection

　　4 x Gigabit Ethernet ports (one dedicated to management).

　　Drives and Expansion.

　　Approximately to 12 3.5? SAS 1/2 or SATA I/II/III hard disks or 2 to 3 solid state drives (with as much as 9 hard disk drives).

　　Drives of any manufacturer, capability, spindle speed, and/or cache can be utilized. No tools or carriers required. Visit this site for drive suggestions.

　　Expandable by adding drives or hot-swapping drives with bigger ones. Utilize the Capacity Calculator to approximate available storage in different setups.

　　BeyondRAID Features.

　　Thin Provisioning.

　　Instantaneous Expansion.

　　Blended Drive Size Utilization.

　　Automatic Protection Levels.

　　Single-- or Dual-Disk Redundancy.

　　Virtual Hot Spare.

　　Data Aware.

　　Drive Re-ordering.

　　Management.

　　Drive bay indication lights, capability gauge, status lights.

　　Drobo Dashboard version 2.0 or later.

　　Running System Support.

　　Mac OS X 10.6 and higher.

　　Windows 8/8.1 32 and 64 bit.

　　Windows 7 32 and 64 bit.

　　Windows XP SP3 32 and 64 bit.

　　Windows Server 2012 32 and 64 bit.

　　Windows Server 2008 R2 SP1 32 and 64 bit.

　　Windows Server 2003 32 and 64 bit.

　　Red Hat Enterprise Linux 6 (Intel just).

　　VMware vSphere 5.0-- 5.1 U2 (ESXi).

　　Submit System Options.

　　Mac OS X: HFS+.

　　Windows: NTFS.

　　Linux: ext3.

　　VMware: VMFS.

　　Network Protocols.

　　iSCSI.

　　CHAP Authentication.

　　Ethernet Features.

　　Connection Failover.

　　Jumbo frames (up to 9000 bytes MTU).

　　Hardware Features.

　　Carrier-less Drive Bays.

　　Field changeable controller card, power products and cooling fan device.

　　Extra Software Features.

　　Automated Data-Aware Tiering (readily available in firmware version 1.1.0 or higher).

　　Smart Volumes (LUNs, approximately 255).

　　Maximum System Capacity: 48TB.

　　Drive Spin Down.

　　Size and Weight.

　　3U Rack Mount Form Factor (rack mount kit included).

　　Width: 17.17 in (436.1 mm).

　　Height: 5.20 in (132.1 mm).

　　Depth: 21.85 in (555.0 mm).

　　Weight: 47 pound (21.3 kg) without tough drives, power supply, or packaging.

　　Power and Cooling.

　　Dual, redundant, hot-swappable power supplies: Air Conditioner Input-- 100/240 VAC, 8/5 A, 50/60 Hz.

　　Redundant, hot swappable cooling unit.

　　Ecological Specifications.

　　Running Temperature: 10C-- 35C (50-- 95F).

　　Non-Operating Temperature (storage): -10-- 60C (14-- 140F).

　　Running Humidity: 20 %-- 80 %.

　　Certifications.

　　Environmental: RoHS, WEEE, REACH.

　　Regulatory: FCC Part 15 Class A; Canada ICES-003 Class B; CE Mark; CISPR22 Class B; MIC Mark; VCCI Approval to V. 3; BSMI Approval to CNS13438; ACA Approval to AS/NZS 3548.

　　Safety: UL, cUL, TUV, CB.