Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review – The SAS Awakens

SNIA Latency Test

The Latency Test measures average and maximum response times
using random IOs at specified Block Sizes and Read/Write mixes, taken under
steady state conditions.  The test runs at a Queue Depth of 1 (1 outstanding
IO), thus the results give the baseline response time for a single IO request.

The test also reports maximum latency values, which can be
helpful to see if there might be processes within the drive that may cause max
Latency values to become larger.

Here are the results –

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SNIA Latency Test – Power Efficiency Mode – Single Port

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

You can see here that Steady State was achieved in Round 1
through Round 5 (the ‘Measurement Window’). Note that the 4K Write line is used
to determine the achievement of steady state.

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

These are the Average and Maximum Latency Values observed in
each round of the Measurement Window (measured in Milliseconds).

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Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

Here is a 3D graph showing, at a glance, the Maximum Latency
values for each combination of Read/Write Mix and IO Size.

 

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

 

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Here is a 3D graph showing, at a glance, the Average Latency
values for each combination of Read/Write Mix and IO Size.   

 


SNIA Throughput Test – Maximum Performance Mode – Single
Port

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

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Again, Steady State is achieved in Rounds 1 through 5.

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

 

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

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Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

We can see that the average latencies are similar in both
power modes, however the max latency values appear to be a bit worse in Maximum
Performance mode.  We’ll look more closely at the Quality of Service later in
this review.


SNIA Throughput Test – Product Comparison

For interest we present a comparison of the 4K 65% Reads 35%
Writes latency results in comparison with those of the other Enterprise SSDs we
have tested –

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

These are outstanding results only beaten by Intel’s NVMe
PCIe drives.

 

Toshiba PX04SMB160 SAS 1600GB Enterprise SSD Review - The SAS Awakens

Wow, these are by far the best maximum latency results we have
seen in this test and they are a portent of an outstanding Quality of Service,
which we will look at more closely in the Myce/OakGate 4K Reads and Writes
Latency Tests on the next page.

 

Now let’s head to the next page, to look at the results
for the Myce/OakGate 4K Read and Write Latency Tests……

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