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JMicron JMF667H Firmware Preview Testing with L85A, L85C and A19 Flash

By: Chris Ramseyer | SSDs in Storage | Posted: Jun 2, 2014 2:45 am

Futuremark PCMark 8 Extended – Consistency Test

 

Version and / or Patch Used: 2.0.228

 

Heavy Usage Model:

 

FutureMark's PCMark 8 allows us to wear the test drive down to a reasonable consumer steady state and then watch the drive recover on its own through garbage collection. To do that, the drive gets pushed down to steady state with random writes and then idle time between a number of tests allows the drive to recover.

 

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.

 

jmicron_jmf667h_firmware_preview_testing_with_l85a_l85c_and_a19_flash_60

 

All four of the JMicron reference design samples lose a lot of performance when the flash is in a dirty state. The A19 model with 240GB of user capacity recovers much faster than the other drives, but the A19 128GB model delivers the highest real-world performance when recovered.

 

As you can see on the chart, recovery performance is very high on these drives in real-world tests. Now we understand why JMicron was so excited to send us reference design hardware with the latest firmware.

 

Consistency – All Tests

 

Here we see all of the tests plotted on the same chart. This shows the drive from worst case to steady state to recovery performance.

 

jmicron_jmf667h_firmware_preview_testing_with_l85a_l85c_and_a19_flash_61

 

Here we see all of the tests. Three of the four drives recover very well when compared to the other 128GB capacity class drives on the market. They are also higher than SanDisk's Extreme II after recovery, our highest performer in this capacity size and one of the most consistent drives on the market.

 

Sadly, the JMicron drives can't keep the same level of performance all the way through. While the JMF667H hits high marks when clean, the dirty states show poor performance. The difference between is quite wide, but JMIcron's market is users not writing a lot of data to the flash per day. That leaves the drive in a relatively clean state most of the time.

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