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RAM SSDs versus Flash SSDs - which is Best?
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Flash Hype Leads to SSD Myopia - Says Solid Data

Editor:- September 29, 2009 - Steve Topper, CEO of Solid Data Systems today commented on market perceptions about RAM SSD versus flash SSD positioning in a press release about the company's updated range of FC compatible terabyte class RAM SSDs.

"There is a market perception that only NAND flash is solid-state storage and that DRAM is too expensive and too volatile," said Steve Topper. ""The market is being told that flash drives are the way to go as they are cheaper and can best deliver enterprise-class performance and reliability. This simply is not true. While flash is somewhat less expensive than DRAM, they cannot beat us on latency and performance, and large numbers of customers have told us that the endurance of these products simply is not there. In many cases, these drives wear out after only days of use."

Editor's comments:- while I wouldn't agree exactly with all the details in these comments. I do agree with some of it. It's important to realize that the most competitive RAM SSDs are best regarded as part of a product continuum which starts with flash and extends up to RAM. If a flash SSD can do the job - it generally will be chosen because of the lower cost.

But in some applications access-time replaces random-IOPS as the key determinant of application performance.

Let's say for example that a critical bottleneck in your application looks like a small table resident on the SAN which involves 5 consecutive R/W modify cycles to the same block of memory. At the system level - a RAM SSD can be 10x to 20x faster than a flash SSD - even if it has the same nominal random IOPS* and data throughput. It's an undeniable fact that RAM SSDs do a better job at application speedup for a small group of applications - regardless of the 9x higher typical cost for the same capacity. That's why customers still buy them.

* There are rare exceptions. Violin Memory has patented a non blocking write in their flash SSD array - which enables a read operation to immediately follow a write on the same block (without waiting for the erase write to complete). But I don't know how many consecutive operations would be speeded up in that architecture - maybe just the next one in the sequence - but not the whole set.


QLogic Ships 40Gbps InfiniBand Switches

Editor:- June 8, 2009 - QLogic today announced general availability of its 12000 Series 40Gb/sec QDR InfiniBand switches.

"With 864 ports and bandwidth of 51 terabits per second, the QLogic 12000 series is the highest capacity general purpose QDR InfiniBand switch on the market today," said David Vellante, co-founder of Wikibon.org. "The huge bandwidth of this solution brings HPC customers better scale-out performance, lower latencies, simpler management and reduced costs."

See also:- SAN switches, InfiniBand

OnPATH Unveils Industry's Largest Fibre Channel Switch
Marlton, NJ - October 21, 2008 - OnPATH Technologies today introduced its first 8Gbps Fibre Channel switch module.

The new module supports up to 12 multi-rate Fibre-Channel ports and can be scaled up to 1,536 8Gb FC ports in one non-blocking switch. ...OnPATH Technologies profile, SAN switches
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Top 10 Storage Articles on STORAGEsearch.com?

The top 10 most popular articles on STORAGEsearch.com in January 2009 - were as follows...
  1. the Solid State Disks Buyers Guide
  2. War of the Disks: Hard Disk Drives vs. Flash SSDs
  3. the Fastest SSDs
  4. SSD Myths and Legends - "write endurance"
  5. the Top 10 SSD OEMs
  6. RAM SSDs versus Flash SSDs - which is Best?
  7. Flash Memory vs. Hard Disks - Which Will Win?
  8. Looking Ahead to the 2009 SSD Market
  9. the Benefits of SAS for External Subsystems
  10. Are MLC SSDs Ever Safe in Enterprise Apps?
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