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Samsung 750 EVO 120 & 250GB SATA III SSDs Review

By: Jon Coulter | SSDs in Storage | Posted: Feb 16, 2016 3:00 pm
TweakTown Rating: 96%Manufacturer: Samsung

Futuremark PCMark 8 Extended

 

Heavy Workload Model

 

PCMark 8's consistency test simulates an extended duration heavy workload environment. PCMark 8 has built-in, command line executed storage testing. The PCMark 8 Consistency test measures the performance consistency and the degradation tendency of a storage system.

 

The Storage test workloads are repeated. Between each repetition, the storage system is bombarded with a usage that causes degraded drive performance. In the first part of the test, the cycle continues until a steady degraded level of performance has been reached. (Steady State)

 

In the second part, the recovery of the system is tested by allowing the system to idle and measuring the performance after 5-minute long intervals. (Internal drive maintenance: Garbage Collection (GC)) The test reports the performance level at the start, the degraded steady-state, and the recovered state, as well as the number of iterations required to reach the degraded state and the recovered state.

 

We feel Futuremark's Consistency Test is the best test ever devised to show the true performance of solid state storage in an extended duration heavy workload environment. This test takes on average 13 to 17 hours to complete and writes somewhere between 450GB and 14,000GB of test data depending on the drive. If you want to know what an SSDs steady state performance is going to look like during a heavy workload, this test will show you.

 

Here's a breakdown of Futuremark's Consistency Test:

 

Precondition phase:

 

1. Write to the drive sequentially through up to the reported capacity with random data.

2. Write the drive through a second time (to take care of overprovisioning).

 

Degradation phase:

 

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for 10 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 8 times, and on each pass increase the duration of random writes by 5 minutes.

 

Steady state phase:

 

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for 50 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 5 times.

 

Recovery phase:

 

1. Idle for 5 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 5 times.

 

Storage Bandwidth

 

PCMark 8's Consistency test provides a ton of data output that we use to judge a drive's performance.

 

samsung-750-evo-120-250gb-sata-iii-ssds-review_42

 

We consider steady state bandwidth (the blue bar) our test that carries the most weight in ranking a drive/arrays heavy workload performance. Performance after Garbage Collection (GC) (the orange and red bars) is what we consider the second most important consideration when ranking a drives performance. Trace-based steady state testing is where true high performing SSDs are separated from the rest of the pack.

 

The BP5e takes one back from the EVO's with better heavy duty steady state performance. This is directly related to overprovisioning. The BP5e is heavily overprovisioned in comparison to the EVO's and with this brutal test that makes a massive difference in steady state performance.

 

The EVO is a moderate workload juggernaut but shows some weakness with steady-state heavy workloads. The 850 EVO recovers full performance after one 5-minute interval of garbage collection as does the 120GB 750 EVO. The 250GB 750 EVO needs more time to recover fully.

 

samsung-750-evo-120-250gb-sata-iii-ssds-review_43

 

We chart our test subject's storage bandwidth as reported at each of the test's 18 trace iterations. This gives us a good visual perspective of how our test subjects perform as testing progresses. This chart sheds a little more light on how the drives perform as they progresses through the testing phases.

 

Total Access Time (Latency)

 

We chart the total time the disk is accessed as reported at each of the test's 18 trace iterations. The MDD BP5e maintains excellent latency across all 18 phases of this brutal test which will result in the BP5e being able to write more random data in 470 minutes than the EVO's as we will see in on display with our data written chart.

 

samsung-750-evo-120-250gb-sata-iii-ssds-review_44

 

Disk Busy Time

 

Disk Busy Time is how long the disk is busy working. We chart the total time the disk is working as reported at each of the tests 18 trace iterations.

 

samsung-750-evo-120-250gb-sata-iii-ssds-review_45

 

When latency is low, disk busy time is low as well.

 

Data Written

 

We measure the total amount of random data that our test drive/array is capable of writing during the degradation phases of the consistency test. Pre-conditioning data is not included in the total. The total combined time that degradation data is written to the drive/array is 470 minutes. This can be very telling. The better a drive/array can process a continuous stream of random data, the more data will be written.

 

samsung-750-evo-120-250gb-sata-iii-ssds-review_46

 

Combined read/write latency, capacity and overprovisioning are the biggest factors that determine the outcome of this portion of the test. Over-provisioning goes a long way with this test. Even the BX200 can write much more data than the EVO's because it is over-provisioned more. In a strange turn of events, the SP550 is able to win a test. However, if we were to OP the EVO's with the same amount of OP as the competing SSDs in our test pool, the outcome would be much different.

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