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)
After lining up many new SAS hard drives, three representative controller solutions and two storage appliances, it is obvious that it was entirely worth waiting for SAS. If you read the technical documentation about SAS, you'll understand why. Not only has the serialized version of SCSI been transformed into a fast, convenient and easy-to-use storage interface, but it has also reached a level of scalability and sophistication that makes Ultra320 SCSI look like a stone age leftover.
Besides, interoperability is very smooth. If you were toying with the idea of buying professional SATA equipment for your server(s), you really should really think about SAS instead. Any SAS controller and enclosure available is compatible with either SAS or SATA hard drives and is thus suitable for either high-capacity SATA or high-performance SAS environments - or both at the same time.
Externally-operated storage devices are the next advantage for SAS: While SATA hardware either used proprietary cabling or is based on a single SATA/eSATA link, SAS links scale up in units of four SAS connections. This allows for matching bandwidth to the actual requirements rather then being stuck at UltraSCSI's 320 MB/s or SATA's 300 MB/s. Moreover, SAS expanders can be used to cascade SAS devices, giving administrators a powerful operating range.
Any future performance benefits will also only be available for SAS devices. We expect the industry to reduce its UltraSCSI offers to a level at which it does no more than support existing UltraSCSI deployments. All new hard drives and the latest enclosures and appliances, as well as interface speed upgrades to 600 and eventually 1,200 MB/s, are geared for SAS.
So, what storage infrastructure should you buy today? With the availability of SAS, the days of UltraSCSI are numbered. The serialized version does everything better, so whether to get UltraSCSI or SAS becomes obvious. The decision becomes more difficult if you choosing between SAS or SATA. However, as long as your storage requirements are clearly assessable on the long term, SAS components likely offer the better bang for the buck, which is certainly the case for high capacity near-line storage scenarios. Indeed, for maximum performance or big time scalability, there is no alternative to SAS.
- 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)