Page 1:SAS Raises Storage Capabilities To Higher Power
Page 2:SCSI's Details And History
Page 3:From SATA...
Page 6:SAS Backplanes & Cables
Page 7:SAS As Part Of SAN Storage Solutions
Page 8:2.5" SAS Hard Drives
Page 9:Fujitsu MAY2073RC
Page 10:3.5" SAS Hard Drives
Page 11:Hitachi UltraStar 15K147 SAS (HUS151414VLS300)
Page 12:Maxtor Atlas 15KII
Page 13:Seagate Cheetah 15K.4B 147 GB (ST3146854SS)
Page 14:Host Adapters
Page 15:Adaptec SAS 48300
Page 16:RAID Adapters
Page 17:LSI Logic SAS3442X
Page 18:SAS Appliances And Enclosures
Page 19:Storage System
Page 20:Adaptec SANbloc S50 JBOD, Continued
Page 21:Test Setup
Page 22:Hard Drive Test Results
Page 23:3.5" SAS Data Transfer Diagrams
Page 24:Data Transfer Performance
Page 25:Access Time
Page 26:I/O Performance
Page 27:SAS RAID Test Results (4 And 10 Drive Arrays)
Adaptec SANbloc S50 JBOD
SANbloc S50 is an enterprise level 12-drive 2U rack mount solution for SAS controllers. This is probably the best example of enterprise scale SAS applications. The 12 drives may be either SAS or SATA drives, or a mixture of both. The included expander logic uses one or two SAS quad links to hook the S50 up to your host adapter or RAID controller. It is obvious that we are talking about a professional solution as it is based on two redundant power supply units with independent power inlets.
If you're already using an Adaptec SAS host adapter, you will be happy to hear that you can actually use the Adaptec Storage Manager to control the S50 and its drives. Using SATA hard drives at 500 GB each, the maximum of 12 drives will result in 6 TB of storage space, while 300 GB SAS drives will result in 3.6 TB. At two quad SAS links to the host adapter, the bandwidth is 2.4 GB/s, which should definitely be more than enough for any type of array. Putting all 12 drives into a RAID 0 array would result in maximum transfer rates of around 1.1 GB/s. A slightly different version with two independent SAS I/O modules will be available in the middle of this year.
The unit includes automatic temperature monitoring and includes automatic fan speed control. Yet, it was noisy enough for us to ban it from our offices after our tests were completed. Drive failure is communicated to the controller via SES-2 (SCSI Enclosure Services) or over a physical I2C interface.
Different from drive operating environment temperatures (41-131°F or 5-55°C), the enclosure may operate in between 32-104°F (0 and 40°C).
At the beginning of our tests, we reached burst transfer speeds of only 610 MB/s only. After changing the interface cable between the S50 and the Adaptec host controller, we finally managed to hit 760 MB/s. We found seven hard drives to saturate the system in RAID 0. Adding more drives would not allow for higher throughput.
- SAS Raises Storage Capabilities To Higher Power
- SCSI's Details And History
- From SATA...
- SAS Backplanes & Cables
- SAS As Part Of SAN Storage Solutions
- 2.5" SAS Hard Drives
- Fujitsu MAY2073RC
- 3.5" SAS Hard Drives
- Hitachi UltraStar 15K147 SAS (HUS151414VLS300)
- Maxtor Atlas 15KII
- Seagate Cheetah 15K.4B 147 GB (ST3146854SS)
- Host Adapters
- Adaptec SAS 48300
- RAID Adapters
- LSI Logic SAS3442X
- SAS Appliances And Enclosures
- Storage System
- Adaptec SANbloc S50 JBOD, Continued
- Test Setup
- Hard Drive Test Results
- 3.5" SAS Data Transfer Diagrams
- Data Transfer Performance
- Access Time
- I/O Performance
- SAS RAID Test Results (4 And 10 Drive Arrays)