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


View All Comments

  • squashmeister99 - Tuesday, September 27, 2011 - link

    You teased us with your video reviews. Now we cant go back... :-) Reply
  • G-Man - Tuesday, September 27, 2011 - link

    I miss the video reviews already :-) Reply
  • vol7ron - Tuesday, September 27, 2011 - link

    hahaha. they are a good addition aren't they? Reply
  • Rasterman - Wednesday, September 28, 2011 - link

    Comparing a single Vertex 3 240GB to a 1.6TB doesn't seem quite valid. Someone considering the R4 would be asking what is the performance difference between the R4 and 4 to 16 Vertex 3s in RAID 0. Especially considering the massive cost savings per GB using the Vertex 3s. Reply
  • MrBungle123 - Wednesday, September 28, 2011 - link

    I'd like to see some RAID 5/6/10 arrays of 15K RPM SCSI drives in the benchmarks too. Reply
  • marraco - Wednesday, September 28, 2011 - link

    No. I don't want video reviews, unless they have English subtitles. Reply
  • SilthDraeth - Wednesday, September 28, 2011 - link

    I have trouble hearing and use subs for all my movies, yet Anand speaks quite clearly, and I have no trouble understanding him.

    Also, he posts the video review in conjunction with the written review, and not as a stand alone feature, so you really don't need it subtitled. So you would still get to enjoy the reviews as you always have.
  • Lonbjerg - Thursday, September 29, 2011 - link

    You can write english but not understand it when it's spoken? *shakes head* Reply
  • connor4312 - Thursday, September 29, 2011 - link

    I'm guessing you never learned a second language? Reply
  • arthur449 - Wednesday, September 28, 2011 - link

    Not all information provided is specifically relevant to everyone's interests in a review of a product. Similarly, information provided in a video review follows a linear arbitrary organizational structure that cannot possibly align with everyone's preferred method of learning. Also, it's easier to skim / search / quote / share a text-based review. Reply

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