Adaptec 31205 PCIe SAS RAID Controller
Choose an Adaptec Unified Serial™ controller to leverage cost-effective, high-capacity Serial ATA (SATA) disk drives or high-performance Serial Attached SCSI (SAS) drives, or both, in a single storage system. With Adaptec Unified Serial controllers, you can scale up to 60TB (using 500GB drives) and increase performance for SATA and SAS storage.
Attach directly to SATA and SAS midplanes with up to 12 disk drives or increase capacity using SAS expanders. With an x8 lane, 800 MHz processing power and 256MB of memory, your large capacity solutions will maximize performance and scalability.
The Adaptec RAID 31205 is a 12-port controller that supports SATA and SAS drives and next-generation PCIe connectivity. It features Adaptec RAID Code (ARC) with RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50, 60, JBOD, as well as Copyback Hot Spare and optional Snapshot Backup.
The card has 256MB of DDR2 memory and a battery unit is optional. Adaptec Storage Manager™ provides one-view, centralized management for all Adaptec RAID controllers.
Highlights
- 12 ports support up to 12 SATA and SAS drives
- Supports up to 128 SAS or SATA devices with SAS Expanders
- 8-lane PCIe host interface
- 3 Gb/s per port
- RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50, 60, JBOD
- Copyback Hot Spare and optional Snapshot Backup
- LED header for drive activity and failure indication
- SES2 and SGPIO enclosure management
- 256MB DDR2 fixed data cache
- RoHS compliant
- Optional battery backup module
- 3 year warranty

Comparison Chart
| Model Name | 3405 | 31205 |
|||
| Form Factor | MD2 - Low Profile |
MD2 - Low Profile |
MD2 - Low Profile |
Half Length / Full Height | Half Length / Full Height |
| Ports | 4 | 8 | 8 | 12 | 16 |
| Connectors | 1 internal SFF-8087 | 2 internal SFF-8087 | 2 external SFF-8088 | 3 internal SFF-8087 | 4 internal SFF-8087 |
| Bus Interface | 4-lane PCIe | 4-Lane PCIe | 8-Lane PCIe | 8-Lane PCIe | 8-Lane PCIe |
| Processor | Intel 80333 500MHz | Intel 80333 500MHz | Intel 80333 800MHz | Intel 80333 800MHz | Intel 80333 800MHz |
| Cache | 128MB | 128MB or 256MB | 256MB | 256MB | 256MB |
| Part Number | 2251800-R | 2252100-R | 2251600-R | 2252600-R | 2252900-R |
Related Items
This kit combines 1 quad-port L-bracket adapter, 3 external cables and 3 internal cables to connect your internal multilane SATA or SAS controller with SFF-8087 connectors to an external enclosure with SFF-8470 connectors. Supports 12 channels.
12 hot-swappable SATA drives in high quality steel enclosure with a space-saving 2U form factor. 3 SFF-8088 4X connectors on the back can be used with our 4x combo cable and L-bracket kits. Fan failure/temperature alarms. Four quiet internal fan ensure effective cooling. Rails are included!
12 hot-swappable SATA drives in high quality steel enclosure with a space-saving 2U form factor. 3 SFF-8088 4X connectors on the back can be used with our 4x combo cable and L-bracket kits. Fan failure/temperature alarms. Redundant power supply for uninterrupted uptime. Rails are included!
The Adaptec Battery Module 800 provides support for the Adaptec 3405, 3805, 3085, 31205, and 31605 RAID controllers. Also supports the new 5 series controllers.
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