Sequential Read/Write Speed

To measure sequential performance I ran a 1 minute long 128KB sequential test over the entire span of the drive at a queue depth of 1. The results reported are in average MB/s over the entire test length. These results are going to be the best indicator of large file copy performance.

Desktop Iometer - 128KB Sequential Read (4K Aligned)

Desktop Iometer - 128KB Sequential Write (4K Aligned)

Again we see that low queue depth transfers don't stress the Z-Drive enough to flex its muscles.

Sequential Performance vs. Transfer Size (ATTO)

I stopped putting these charts in our reviews (although I do include the data in Bench) because they are generally difficult to read. Here we're only going to look at three drives though: a Vertex 3, RevoDrive 3 X2 and the Z-Drive R4 CM88:

Now we're starting to see something. If you can't scale with queue depth, scaling up the transfer size seems to do the trick. After about 64KB the Z-Drive R4 starts to pull away fro the RevoDrive 3 X2, peaking at just over 2.5GB/s!

Read performance is even more impressive: the Z-Drive R4 manages just under 3GB/s for 2MB transfer sizes.

Random Read/Write Speed AS-SSD Incompressible Sequential Performance
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  • josephjpeters - Tuesday, September 27, 2011 - link

    And why is that? Because of the supposed high failure rates? Can you supply any real information about this?

    OCZ has less then 1% failure rate. There may be more then 1% of customers who have "issues" but they aren't related to the drive. User error plays a pretty big role, but of course it MUST be OCZ's fault right?

    Enterprise customers are professionals who know how to install serious hardware like this. And if they don't? OCZ will help install it for them on site. That's what enterprise companies do!

    Reply
  • Troff - Tuesday, September 27, 2011 - link

    I don't believe that 1% number for a second. First of all, I read some return stats from a store that listed the RETURN rate at just below 3%. Secondly, I know of 5 very different systems with Vertex 3 drives in them. All 5 have recurring lockups/BSODs. The people who built and run these systems write their own filesystems. They are extremely knowledgeable. If they can't make them run properly, they are not fit to run outside of a lab environment.

    That said, I suspect it's as much Sandforce that's the problem as it is OCZ.
    Reply
  • josephjpeters - Wednesday, September 28, 2011 - link

    I think it's an Intel problem. But NooOoOo... it can't be an Intel problem... Reply
  • geddarkstorm - Wednesday, September 28, 2011 - link

    From all the data I've been seeing, it seems to be a SATA III issue, and an issue with motherboards not being reading for such high volumes of data flow. Mechanical drives can get no where near SSD speeds, and I don't think manufacturers were really expecting how fast they'd go on SATA III (almost pegging it out at times, and it's brand new!). Reply
  • josephjpeters - Wednesday, September 28, 2011 - link

    Exactly. It's not an OCZ issue, it's the motherboard. When will someone step in and take the blame? Reply
  • Beenthere - Tuesday, September 27, 2011 - link

    SSDs appear to be an on-the-job learning program for SSD manufacturers with all the issues that currently exist.

    I do not however believe they are selling SSDs at low margins.

    Enterprise won't use SSDs yet for the same reason informed consumers won't use them - they have serious reliability and compatibility issues. Unless you can afford lost data and a hosed PC, SSDs are not even an option at this point in time. Maybe in a couple more years they will sort out the problems that should have resolved long agao?
    Reply
  • dave1231 - Tuesday, September 27, 2011 - link

    I wonder really how much a consumer SSD costs to produce. Saying that slim margins will force companies out of business if there's a big markup on a 128GB is not true. These same drives were $100s of dollars last year and probably still aren't good value today. Unless you're saying consumers are waiting for the .50c/GB drive. Reply
  • josephjpeters - Tuesday, September 27, 2011 - link

    It's roughly 20% margins and the price of an SSD is directly related to the cost of Flash. Owning the controller IP is key in maintaining solid margins.

    Enterprise drives will drive flash demand which will lead to economies of scale that result in cheaper Flash prices and consequently cheaper consumer SSD's.
    Reply
  • ChristophWeber - Tuesday, September 27, 2011 - link

    Anand wrote: "I've often heard that in the enterprise world SSDs just aren't used unless the data is on a live mechanical disk backup somewhere. Players in the enterprise space just don't seem to have the confidence in SSDs yet."

    I use an SSD in an enterprise environment, a first gen Sandforce model from OWC. I do trust it with my main workload - database and web server in this case, but of course it is still backed up to mirrored hard drives nightly, just in case.

    I'd have no qualms deploying a Z-Drive R4 in one of our HPC clusters, but it'd be an RM88 model with capacitors, and I'd still run the nightly rsync to a large RAID unit. Now if someone would finally signal they want to spend another $100k on a cluster, and I'll spec a nice SSD solution for primary storage.
    Reply
  • nytopcat98367 - Tuesday, September 27, 2011 - link

    is it bootable? can it b used 4 a desktop too? Reply

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