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How We Test Samsung's 845DC EVO SSD

Samsung 845DC EVO SSD Review: 3-Bit MLC Hits The Enterprise
By
Test Hardware
ProcessorIntel Core i7-3960X (Sandy Bridge-E), 32 nm, 3.3 GHz, LGA 2011, 15 MB Shared L3, Turbo Boost Enabled
Motherboard
Intel DX79SI, X79 Express
Memory
G.Skill Ripjaws Z-Series (4 x 4 GB) DDR3-1600 @ DDR3-1600, 1.5 V
System Drive
Intel SSD 320 160 GB SATA 3Gb/s
Host Bus Adapter
LSI SAS 9300-8e
Tested Drives
Samsung 845DC EVO 960 GB
Comparison Drives
Micron M500DC 800 GB
Micron P400m 200 GB
Intel SSD DC S3500 480 GB
Intel SSD DC S3700 800 GB
SanDisk Optimus Eco 400 GB
Seagate 600 Pro 200 GB
Graphics
AMD FirePro V4800 1 GB
Power Supply
OCZ ModXStream Pro 700 W
System Software and Drivers
Operating SystemWindows 7 x64 Ultimate
DirectXDirectX 11
DriverGraphics: AMD 8.883
Benchmark Suite
Iometer v1.1.0
Four Workers, 4 KB Random: LBA=Full, Span Varying Queue Depths
ATTO
v2.4.7, 2 GB, QD=4
Custom
C++, 8 MB Sequential, QD=4
Enterprise Testing: Iometer Workloads
Read
Write
512 Bytes
1 KB
2 KB
4 KB
8 KB
16 KB
32 KB
64 KB
128 KB
512 KB
Database
67%
100%
n/a
n/a
n/a
n/a
100%
n/a
n/a
n/a
n/a
n/a
File Server
80%
100%
10%
5%
5%
60%
2%
4%
4%
10%
n/a
n/a
Web Server
100%
100%
22%
15%
8%
23%
15%
2%
6%
7%
1%
1%

The Storage Networking Industry Association (SNIA), a working group made up of SSD, flash, and controller vendors, has a testing procedure that attempts to control as many of the variables inherent to SSDs as possible. SNIA’s Solid State Storage Performance Test Specification (SSS PTS) is a great resource for enterprise SSD testing. The procedure does not define what tests should be run, but rather the way in which they are run. This workflow is broken down into four parts:

  1. Purge: Purging puts the drive at a known starting point. For SSDs, this normally means Secure Erase.
  2. Workload-Independent Preconditioning: A prescribed workload that is unrelated to the test workload.
  3. Workload-Based Preconditioning: The actual test workload (4 KB random, 128 KB sequential, and so on), which pushes the drive towards a steady state.
  4. Steady State: The point at which the drive’s performance is no longer changing for the variable being tracked.

These steps are critical when testing SSDs. It’s incredibly easy to not fully condition the drive and still observe out-of-box behavior, which may lead one to think that it’s steady-state. These steps are also important when going between random and sequential writes.

For all performance tests in this review, the SSS PTS was followed to ensure accurate and repeatable results.

All tests employ random data, when available. Samsung's 845DC EVO does not perform any data compression prior to writing, so there is no difference in performance-based data patterns.

For comparison purposes, we evaluated the 845DC EVO against similar products from Micron, Intel, SanDisk, and Seagate.

Display all 14 comments.
  • 3 Hide
    SteelCity1981 , June 2, 2014 6:28 AM
    So basicly it's the more durable version of the 840 evo much like opertons and xeons are to the FX and core i7 series.
  • -8 Hide
    Plusthinking Iq , June 2, 2014 6:48 AM
    like we know now after the ssd endurance test samsung is the worst enterprise candidate.
  • 3 Hide
    drewriley , June 2, 2014 7:43 AM
    Quote:
    So basicly it's the more durable version of the 840 evo much like opertons and xeons are to the FX and core i7 series.


    Yes, that's a fair analogy. Just like the Xeon E3-1275v3 is an i7-4770K, but with ECC support.

  • 2 Hide
    damric , June 2, 2014 12:45 PM
    I've yet to see an SSD fail due to read/write endurance. I only see them fail when the controller gets bugged, which seems to happen all the time, especially on loss of power.



  • 0 Hide
    soundping , June 2, 2014 1:13 PM
    I'm guessing this SSD doesn't have to new firmware code that extends life and speed.
  • 0 Hide
    jase240 , June 2, 2014 3:02 PM
    Another win for the EVO. This SSD modified for enterprise workloads makes it a good buy for webservers.

    Hopefully the price will go down after launch, and then I see this being the best choice of webhosts.

    Cheaper and adequate for that workload.
  • 0 Hide
    Nightmare Twily , June 2, 2014 5:18 PM
    Eh I'll keep my 840 EVO 250GB
  • 0 Hide
    Nuckles_56 , June 3, 2014 4:12 AM
    "Even still, I wand to commend Samsung's execution." (last page 1st paragraph) I guess that is supposed to be want, unless Drew Riley has become a wizard now :D 
  • 0 Hide
    Menigmand , June 3, 2014 7:07 AM
    Commending their execution would be a bit harsh, don't you think?
  • 0 Hide
    drewriley , June 3, 2014 8:31 AM
    Quote:
    Commending their execution would be a bit harsh, don't you think?


    I'm sure worse things were said about Samsung at WWDC '14 yesterday ;) 
  • 0 Hide
    drewriley , June 3, 2014 8:33 AM
    Quote:
    "Even still, I wand to commend Samsung's execution." (last page 1st paragraph) I guess that is supposed to be want, unless Drew Riley has become a wizard now :D 


    Now that you mention it.....
  • -1 Hide
    eriko , June 3, 2014 9:53 PM
    4KB random write, and average response time.

    Nuff said.

    You'd have to be out your mind to put TLC in a a critical environment.
  • 1 Hide
    patrick47018 , June 3, 2014 10:30 PM
    @eriko everyone's critical environments need a little tender loving care
  • 1 Hide
    photonboy , June 4, 2014 5:28 PM
    The 845dc isn't necessarily the "worst enterprise candidate"; for one thing it wasn't the bottom in every test.

    For another, it's more about VALUE and that's the main point of the article. I assume the top SSD's in this category were MLC not TLC and also more expensive.
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