Seagate revs up SATA speed
Keep up at the back
Seagate and AMD have demonstrated a 6Gbit/s link between SATA disks and a server, double the speed of the current SATA 2 spec and the same as the fastest SAS speed.
The justification for the faster speed is to try and keep up with the accelerating growth in capacity - and cache capacity - of SATA disks, now at the 2TB level and destined to double and even triple in the foreseeable future. PC and server processors are also gaining more power through multi-CPU and multi-core technology. Also, SATA-interface solid state drives, such as Intel's X25-M SSD, can use the speed hike to get more I/O to/from the drive.
SATA was first launched in 2002 with a 1.5Gbit/s speed - about 150MB/sec - as a replacement for then current parallel ATA (PATA) interconnect standard between storage devices and servers. Serialising the interconnect provided faster speeds, longer cables (up to 1m) and scope for speed increases in the future.
An external SATA (eSATA) interconnect was introduced in 2004. SATA 2 doubled the speed to to 3Gbit/s - about 300MB/sec - in 2005 and started being required by storage devices, according to Seagate, in 2007.
Each SATA standard is backwards-compatible with the previous one.
In August 2008 the Serial ATA International Organisation (SATA-IO) ratified a 6GBit/s physical layer - delivering about 600MB/sec. AMD and Seagate have now teamed up to demo their prototype technology at either end of a SATA cable.
The idea is to introduce the new faster SATA one to two years before it is actually needed so that products can be developed and the technology bedded down in time for use. Seagate recommends that the interface data rate keeps ahead of the media data rate and so does not throttle back the device. The company reckons that SATA 3 won't be really needed until 2011.
By that time we may be hearing about the next SAS speed jump to 12Gbit/s and SATA 4 may also be just visible on the horizon, a couple of years behind.
Seagate says the general SATA 3 specification "has been enhanced with improved power management (and) advanced data steaming". The new standard may formally be known as SATA Revision 3.0, but will probably just get shortened to SATA 3. ®
re: Suburban Inmate
I know you were not being serious, and not to belittle you but firstly iirc (and usb2 may be different) usb is limited to a chain of 127 devices per port on the device controller. Secondly 480mbit is crap next to SATA, thirdly the bandwidth is shared between everything on the chin and finally there is a cpu hit for usb. and i know cpu's are fast and all but its going to be a big hit with hundreds of things on the line.
Poundland joins HP, Dell, IBM in server biz
I was thinking of SSD style RAID, but done cheaper, gaining speed and redundancy from sheer numbers of very small cheap devices.
A few hundred poundland memory sticks, plus a few hundred cascaded poundland USB hubs. Add software RAID 5 in Windows, and Robert's your cousin's father!
What could possibly go wrong?
OCZ Vertex2 - 550MB/s
i am still waiting for the new OCZ Vertex2 drives ... 550MB/s read spead and i guess a lot of other SSD vendors will come out with similar products soon. Building RAIDS directly into SSD sounds like an easy to do thing and will make the new SATA3 standard already look old: