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June 08, 2010


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you folks done any perf testing with fusion i/o flash? After that user group meeting I was thinking about the comments on the write perf of EFDs and I thought back to this blog post I came across a while ago:


random write performance on those tests for 1 Fusion IO card was roughly equivalent to 98 15k RPM disks(RAID 1+0).

The tester used 16kB I/O size, looking at my T400 it is averaging 48kB I/O size to the spindles so wonder how much a difference there would be with a much larger I/O size. The online specs claim 670MB/sec writes with 32kB I/O size on the 160GB version. And the Fusion I/O team claims 24 years of life on an 80GB SLC card writing 5TB/day, which is a far cry from many of the EFDs out there. HP I noticed for one only offers a 1 year warranty on their server SSDs, the same warranty they give to SATA disks.

maybe it's the flash controller? maybe it's the PCIe vs SA(TA)S interface(on EFDs)? Or maybe it's Maybelline?

marc farley

Hi Nate,

There are some folks from Fusion IO that follow this blog that might comment - although it's not my intent to turn StorageRap into a forum for their products. Like all new players that enter the storage universe Fusion IO has to find ways to get past the "risk questions" that inevitably are asked. I'm sure they can explain how, but I won't try.

James Rupprecht

Marc, it appears that you don't have a complete understanding of Compellent's Automated Tiered Storage technology. It has been my experience that most outside of the organization and customer base don't understand it at a deep level. It is a very unique and effective technology; I haven't seen any other tiering technology that approaches it in functionality or efficiency. Not only does it tier both in and out of the physical tier, but it's the only solution out there (that I know of) that allows ingestion of writes at R10 and immediate conversion to R5 after the ingest has been realized. You have made comments in the past that EQL has the same technology; not even close. Though EQL has some technology that is much better than the legacy players like EMC, NTAP, and HDS, it doesn't approach CML in functionality.

I'd love to see a post that breaks down the 3Par solution!


marc farley

Hi James, it's been awhile - how are you doing? I assume you are still working for Compellent based on your comment. BTW, you seem to have given this post an extremely broad interpretation - all this talk about EqualLogic?

Compellent made it's mark in the industry with Data Progression, just as 3PAR did with Thin Provisioning. Of course, companies like ours have to continue to develop all aspects of our technologies.

3PAR's tiering technology, Adaptive Optimization (AO) was designed to address performance acceleration for low latency applications and the requirements of periodic processing cycles. Our systems already have the best sustained throughput - including - or especially - at high utilization levels.

AO functionality is determined by a rich set of internal instrumentation metrics and administrator-determined policies that govern the selection of data, the relative priorities of the data that is tiered and the rate of promotion/demotion. It takes advantage of the multiple QoS levels that have existed in 3PAR systems for years.

James Rupprecht

Nah, the EQL references were mostly in response to several of your last posts...it seemed that whenever CML tiering came up, it was compared to EQL. You did some nice videos some time ago around chunklets and the free space recovery agent now offered with 3Par (FWIW, Compellent has included Windows space recovery at no cost for some time). It would be cool to see something similar for AO!

No longer with CML...back in the VAR space for now.

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