Intels Robson technology
Intels Grimsrud presented findings from the companys work on its flash-based caching system called Robson. As demonstrated at the conference, Robson comprises a flash cache of up to 4GB, a controller ASIC on a PCI Express minicard and driver software on the host computer. Vistas ReadyBoost and ReadyDrive components will support the Intel technology. According to Grimsrud, while capacities of hard drives have improved, latency continues to be a performance bottleneck. As CPU performance has improved some 30 times over the past decade, hard disk latency has improved only 1.3 times in the same period."Its so grossly out of whack that for many workloads the disk drive ends up determining what the effective system performance is. As a CPU company, we obviously care about that," he said.Accordingly, Robson was aimed at "bridging the gap" in performance between memory subsystems, he said. However, unlike Microsoft, which left the management of the flash cache up to the memory vendors, Intel will take control of the flash hardware and software management for Robson. Click here to read about Intels flash manufacturing deal with Micron. Flash memory is susceptible to wear, and flash vendors employ algorithms to spread out erase cycles across all the cells on the flash memory as well as keeping a set of spares. Grimsrud presented data on the endurance ratings of flash memory on the market. The Intel storage group has been concerned about the performance of flash for these applications, he said. The company found that a number of flash products on the market designed for consumer applications while rated for 100,000 cycles came up short and didnt offer the endurance necessary for enterprise applications. "Weve also been surprised that the rate of endurance on the data sheet looks like its been made up by the marketing guys. Weve measured a lot of flash to failure and what we measured doesnt correspond to whats printed on the data sheet. The rated number of erase cycles ... missed by a mile. This was not an isolated case and not in thermal stress either," he said. These comments were greeted by grumbling among the flash industry crowd. And Grimsrud admitted under questioning that the company hadnt tested all modules on the market, and that some products with "improved algorithms" were better. Still, the wear levels reportedly werent up to Intels QA requirements for Robson and the company will use its home-grown NAND memory modules, Intel representatives said. Grimsrud said the company had developed a proprietary management driver technology that will be used in the Robson solution. According to Grimsrud, one advantage of the Robson architecture over embedded flash management software was its tie to a powerful processor. "With a Core Duo processor and the gigabytes of memory that are at our disposal, we can afford to do things that are intractable in a resource-constrained environment," he said. Here are a few other views on Vistas use of flash, Robson and hybrid drives from the conference panels and exhibit hall:
Robson on Macs? "Theres nothing to prevent Robson technology from being used by other OSes," Intels Grimsrud told eWEEK.com.
So, Apple Computer, which now uses an Intel chip set, as well as Linux vendors could support Robson when the machines hit the market next year. Grimsrud was mum on the prospect.
"Theres no commitment yet for other operating system support based on what customers want," he said.
At Apples Worldwide Developers Conference, held in San Francisco concurrently with the Flash Memory Summit, Steve Jobs said the company was holding many features of Mac OS X Leopard, aka v10.5. Apple declined to comment on future Robson support.
Will the Windows Vista vs. Mac OS X Leopard feature fight come down to a few interface elements? The current scrap is over Vistas Flip3D and Apples Expose. Click here to read more.
Hybrid drives. In the exhibit hall, drive vendors Seagate Technology and Samsung Semiconductor demonstrated prototype drives. While representatives wouldnt provide specific target dates for the arrival of this technology, the common theme was a second-quarter note.
Microsoft used an Ascender prototype drive in its demonstration. Ayers said the logo programs for ReadyBoost and ReadyDrive products will begin in June 2007.
Several new and novel advantages of flash-enabled drives were proposed at the conference. For example, Ayers suggested that some users reported that the drives were more quiet than conventional drives.
Don Barnetson, director of flash marketing for Samsung Semiconductor, of San Jose, said that if a flash subsystem can keep a hard drive powered down for 90 to 95 percent of the time, this can protect it during a fall.
"If your notebook is dropped, the odds will be that its going to be dropped when the hard drive isnt running. That can bring a 5X improvement in reliability for the drive," he said.
Barnetson said the companys first hybrid drives will ship with 256MB caches, which will support sleep times for drives of about 10 to 20 minutes.
"Over time we will grow the amount of cache in that hard drive. Rather than spin up a few times an hour, maybe we can get to the point where it spins only a few times a day," he said.
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