Micron 5100 MAX 960GB SATA Enterprise SSD Review

Power Consumption and Data Reliability

Power Consumption

I believe most people know that data centres are already one
of the major consumers of electricity in the industrialised world; indeed it is
estimated that currently 2% of all electricity consumption goes into IT
applications.  According to the European Union the energy consumption of data
centres was 46 Terawatt hours in 2006 and is set to rise to 93 TW hrs by 2020. This
is equivalent to one hundred million 100W light bulbs burning 24 hours a day,
365 days a year.

Typically 40% of the power consumed by data centres is for
the IT load and 35% is for cooling the system.  Generally speaking, if a drive
consumes more power it will produce more heat – so power consumption is indeed
a double edged sword.  It is no surprise then that a significant proportion of
a data centre’s power consumption goes on servers.  I understand cloud based
applications, such as Facebook, are the primary cause of the growth in servers
and the demand for storage space.

If you are a Facebook user, like me and the Reynolds sibs, and
you reside in Europe – this is most probably where your data is click here.  Some
interesting Facebook statistics – Facebook has more than 1 Billion monthly
active users, it generates 1 Trillion page views per month and more than 219
Billion photos have been uploaded since launch – amazing!  Here is an
interesting video showing the remarkable scale of Facebook’s largest North
American data centre click
here.

Power Testing

We present our standard set of power consumption tests.

SNIA Write Saturation

Micron 5100 MAX 960GB SATA Enterprise SSD Review

This test allows us to observe the power consumption
characteristics as the drive passes from a fresh ‘out of the box’ state to one
where blocks must first be cleaned before they can be written to. You can see
that as the need to clean blocks kicks in the power consumption steps up and
then continues to increase slowly as the drive moves towards a Steady State.
From the change in power consumption we can deduce that approximately 600 mW
(3,800 – 3,200 mW) is consumed in the cleaning of blocks.

4K Latency Test – Reads

Micron 5100 MAX 960GB SATA Enterprise SSD Review

This test allows us to observe how power consumption
characteristics vary as the demand for random 4K reads (in terms of IOPS) is
increased.  You can see that the demand for power increases gradually and in a
linear fashion. 

As the boost in power consumption rises more slowly than the
increase in IOPS we know intuitively that the sweet spot with regard to IOPS
per mW is at the highest IOPS level.

 


4K Latency – Writes

Micron 5100 MAX 960GB SATA Enterprise SSD Review

This test allows us to observe how power consumption
characteristics vary as the demand for random 4K writes (in terms of IOPS) is
increased.  You can see that the demand for power increases gradually and in a
linear fashion.

4K Mixed Reads/Writes

 

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

We have then taken the data to calculate the IOPS per mW for
each combination, as follows –

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

Now, let’s compare these results to the results we recorded
for the Samsung SM863 and the Toshiba HK4E –

Micron 5100 MAX 960GB SATA Enterprise SSD Review

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

You can see that the Micron 5100 MAX is significantly more
power efficient for the higher write percentages but significantly less power
efficient for the lower write percentages.

Sequential Reads

Micron 5100 MAX 960GB SATA Enterprise SSD Review

This test allows us to see how power consumption
characteristics vary when performing sequential reads with different
combinations of IO Size and queue depth.  As might be expected, the power
consumption increases as the MB/s increases.

 

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

Now, let’s compare these results to the results we recorded
for the Samsung SM863 and the Toshiba HK4E.

Micron 5100 MAX 960GB SATA Enterprise SSD Review

Micron 5100 MAX 960GB SATA Enterprise SSD Review

You can again see that the Micron 5100 MAX is consistently
less power efficient for sequential reads than its Samsung and Toshiba
competitors.

Sequential Writes

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

This test allows us to see how power consumption
characteristics vary when performing sequential writes with different
combinations of IO Size and queue depth.  As might be expected, the power
consumption increases as the MB/s increases. 

We have then used this data to calculate the MB/s per mW as
follows –

Micron 5100 MAX 960GB SATA Enterprise SSD Review

 

The MB/s per mW results can then be compared to those for
the Samsung SM863 and the Toshiba HK4E.

Micron 5100 MAX 960GB SATA Enterprise SSD Review

Micron 5100 MAX 960GB SATA Enterprise SSD Review

You can again see that for sequential writes the Micron 5100
MAX is consistently less power efficient than its Samsung and Toshiba
competitors.

 

Data Reliability

The ‘Unrecoverable Bit Error Rate’ (UBER),as defined by
JEDEC, the global leader in developing open standards for the microelectronic
industry, is a metric for data corruption rate equal to the number of data
errors per bit read after applying any specified error correction method. UBER
= number of data errors / number of bits read.  JDEC specifies that the maximum
error rate allowable for an Enterprise level SSS solution is one error in every
10^16 bits read.

Micron specifies an UBER of 1 in 10^17 bits read
for the Micron 5100 MAX.

Micron 5100 MAX 960GB SATA Enterprise SSD Review

The Micron 5100 MAX includes power failure support (which
ensures any in flight writes will be completed to NAND in the event of a power failure)
and end-to-end data protection.

 

Now let’s head to the next page, to look at the Conclusions
of this review…..