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Chapter 21. Additional information

21.1. MTV performance addendum
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The data provided here was collected from testing in Red Hat labs and is provided for reference only. 

Overall, these numbers should be considered to show the best-case scenarios.

The observed performance of migration can differ from these results and depends on several factors.

21.1.1. ESXi performance
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ESXi performance can be measured for a single ESXI host or for multiple ESXi hosts.

21.1.1.1. Single ESXi host performance
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Test migration by using the same ESXi host.

In each iteration, the total VMs increase to display the impact of concurrent migration on the duration.

The results show that migration time is linear when increasing the total VMs (50 GiB disk, Utilization 70%).

The optimal number of VMs per ESXi is 10.

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Table 21.1. Single ESXi host tests
Test Case DescriptionMTVVDDKmax_vm inflightMigration TypeTotal Duration

Cold migration, 10 VMs, Single ESXi, Private Network (non-management network)

2.6

7.0.3

100

cold

0:21:39

cold migration, 20 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

0:41:16

Cold migration, 30 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

1:00:59

Cold migration, 40 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

1:23:02

Cold migration, 50 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

1:46:24

Cold migration, 80 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

2:42:49

Cold migration, 100 VMs, Single ESXi, Private Network

2.6

7.0.3

100

cold

3:25:15

21.1.1.2. Multiple ESXi hosts and a single data store
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In each iteration, the number of ESXi hosts was increased, to show that increasing the number of ESXi hosts improves the migration time (50 GiB disk, Utilization 70%).

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Table 21.2. Multiple ESXi hosts and single data store
Test Case DescriptionMTVVDDKmax_vm inflightMigration TypeTotal Duration

Cold migration, 100 VMs, Single ESXi, Private Network (non-management network)

2.6

7.0.3

100

cold

3:25:15

Cold migration, 100 VMs, 4 ESXs (25 VMs per ESX), Private Network

2.6

7.0.3

100

cold

1:22:27

Cold migration, 100 VMs, 5 ESXs (20 VMs per ESX), Private Network, 1 Data Store

2.6

7.0.3

100

cold

1:04:57

21.1.2. Performance using different migration networks
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Each iteration the Migration Network was changed, by using the Provider, to find the fastest network for migration.

The results indicate that there is no degradation by using management compared to non-management networks when all interfaces and network speeds are the same.

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Table 21.3. Different migration network tests
Test Case DescriptionMTVVDDKmax_vm inflightMigration TypeTotal Duration

Cold migration, 10 VMs, Single ESXi, MGMT Network

2.6

7.0.3

100

cold

0:21:30

Cold migration, 10 VMs, Single ESXi, Private Network (non-management network)

2.6

7.0.3

20

cold

0:21:20

Cold migration, 10 VMs, Single ESXi, Default Network

2.6.2

7.0.3

20

cold

0:21:30

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