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Performance Comparison of MP3 only and MP3 + WAV

The graph below compares two test profiles (Profile 1 of MP3 only and Profile 2 of MP3 + WAV as dest2) on the same hardware spec with same 6 VM configurations of 2 vCPU per VM. Below is the CPU usage:

Figure 22: Comparison of System Usage for different test profiles

Overall CPU usage for Software Profile 2 (MP3 + WAV) is slightly higher than for Software Profile 1 (MP3 only).


The two graphs below compare audio quality criteria:

Figure 24: Comparison of Max Jitter among different test profiles
Figure 25: Comparison of Max Delta among different test profiles
  • For this test, applying Profile 2 to a 6 VMs configuration: Preferred/Recommended = 360 ports; Peak Port Capacity = 530 ports, if you can ignore some potential impact to audio quality.

The table below shows the IOPS of the sum of all 6 VMs for a test profile of MP3 + wav:

Table: IOPS of sum of all 6 VMs of dual hex cores, MP3 + wav

Ports Overall Disk IOPS (kbps)
Total Reads Writes
120 42.64 0.01 42.63
240 77.69 0.00 77.69
300 95.99 0.00 95.99
360 114.28 0.00 114.28
420 130.45 0.00 130.45
480 149.58 0.00 149.58
540 172.49 0.00 172.49
600 194.55 0.00 194.55
660 177.80 0.00 177.80

The graph below compares Table: IOPS of sum of all 6 VMs of dual hex cores, MP3 + wav with Table: Disk IOPS of sum of all 6 VMs of dual hex cores, MP3 only:

Figure 26: Comparison of System Disk IOPS for different test profiles on VMs


As we have cache folder on a different SSD drive, we can break down disk IOPS for each drive as below:

Table: Disk IOPS Break Down per Drive, Test Profile 1, MP3 only

Ports Overall Disk IOPS (kbps) SSD Drive E Disk IOPS (kbps) HDD Drive C Disk IOPS (kbps)
Total Reads Writes Total Reads Writes Total Reads Writes
120 25.18 0.03 25.15 20.88 0.00 20.88 4.30 0.03 4.28
240 42.75 0.05 42.70 36.96 0.00 36.96 5.79 0.05 5.74
300 51.16 0.00 51.15 44.63 0.00 44.63 6.53 0.00 6.53
360 59.61 0.00 59.61 52.80 0.00 52.80 6.81 0.00 6.81
420 67.04 0.00 67.04 60.31 0.00 60.31 6.74 0.00 6.74
480 74.82 0.00 74.82 67.85 0.00 67.85 6.97 0.00 6.97
540 86.30 0.00 86.30 79.31 0.00 79.31 6.99 0.00 6.99
600 94.11 0.00 94.11 87.31 0.00 87.31 6.80 0.00 6.80
660 102.05 0.00 102.04 95.12 0.00 95.12 6.92 0.00 6.92
720 111.30 0.00 111.29 104.30 0.00 104.30 6.99 0.00 6.99


Table: Disk IOPS Break Down per Drive, Test Profile 2, MP3 + wav

Ports Overall Disk IOPS (kbps) SSD Drive E Disk IOPS (kbps) HDD Drive C Disk IOPS (kbps)
Total Reads Writes Total Reads Writes Total Reads Writes
120 42.64 0.01 42.63 38.38 0.00 38.38 4.26 0.01 4.26
240 77.69 0.00 77.69 72.07 0.00 72.07 5.62 0.00 5.62
300 95.99 0.00 95.99 89.04 0.00 89.04 6.95 0.00 6.95
360 114.28 0.00 114.28 107.50 0.00 107.50 6.78 0.00 6.78
420 130.45 0.00 130.45 123.56 0.00 123.56 6.89 0.00 6.89
480 149.58 0.00 149.58 142.65 0.00 142.65 6.92 0.00 6.92
540 172.49 0.00 172.49 165.61 0.00 165.61 6.88 0.00 6.88
600 194.55 0.00 194.55 187.53 0.00 187.53 7.02 0.00 7.02

The two graphs below compare corresponding drives:

Figure 29: Comparison of cache folder of SSD Drive IOPS for different profiles

This SSD drive is used exclusively as the cache folder for MCP recording. The IOPS for Profile 2 (two dest2, MP3 + wav) is as double as Profile 1 (one dest. MP3 only).

Figure 30: Comparison of HDD Drive IOPS for different profiles


This HDD drive is used for all operations except the cache folder for MCP recording. IOPS is nearly constant at a regular load and below peak. Thus, the IOPS estimating formula can be:

IOPS1 = C + k * P (dest only)
IOPS2 = C + 2k * P (both dest + dest2)
Where P = ports, C = 7, k = 0.15

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This page was last modified on July 11, 2018, at 00:47.