===== VMware vSAN Multicast =====
{{tag>VMware vSAN}}

Types of vSAN multicast setups that I have tested.  These tests we done on my HP v1910-24G switches.  I have also done some testing on a pair of VDX 6740 switches, but need to clean up any client info before being added to this list.

==== New Tests 2016-06-05 ====

Nerdy Drunk three node vSAN v6.2 on two HP v1910-24G switches with vSAN traffic connected to switch 1.  vSAN VLAN is tagged across both switches with IGMP Snooping enabled on both switches and IGMP Querier enabled on only switch 1.
  * Multicast performance test 27.71 MB/s
  * Multicast performance test 27.85 MB/s
  * Multicast performance test 27.96 MB/s
  * Multicast performance test 28.05 MB/s
  * Multicast performance test 12.06 MB/s
  * Multicast performance test 28.02 MB/s
  * Multicast performance test 28.00 MB/s

Nerdy Drunk three node vSAN v6.2 on two HP v1910-24G switches with vSAN traffic connected to switch 1.  vSAN VLAN is tagged across both switches with IGMP Snooping enabled on both switches and IGMP Querier disabled on both switches.
  * Multicast performance test 12.03 MB/s
  * Multicast performance test 28.09 MB/s
  * Multicast performance test 12.06 MB/s
  * Multicast performance test 12.04 MB/s

Nerdy Drunk three node vSAN v6.2 on two HP v1910-24G switches with vSAN traffic connected to switch 1.  vSAN VLAN is tagged across both switches with IGMP Snooping disabled on both switches and IGMP Querier disabled on both switches.
  * Multicast performance test 12.03 MB/s
  * Multicast performance test 28.06 MB/s
  * Multicast performance test 27.90 MB/s
  * Multicast performance test 12.01 MB/s

Nerdy Drunk three node vSAN v6.2 on two HP v1910-24G switches with vSAN traffic connected to switch 1.  vSAN VLAN is tagged across both switches with IGMP Snooping enabled on only switch 1 and IGMP Querier enabled on only switch 1.
  * Multicast performance test 28.07 MB/s
  * Multicast performance test 27.97 MB/s
  * Multicast performance test 12.05 MB/s
  * Multicast performance test 28.09 MB/s

\\

==== Old Tests ====

<file>
Split multicast, two subnets, isolated switches, two vmks.
	VSAN-001	Multicast performance 27.73


One multicast, one subnet, one switch, one vmk.
	VSAN-004	Multicast performance 27.77
	VSAN-017	Storage performance stress
IOPS		Throughput MB/s	Average Latency (ms)	Maximum Latency (ms)
40.75		0.322		71.91566667		699.0573333


One multicast, one subnet, two switches, two vmks.
	VSAN-007	Multicast performance 7.63


Two multicast, two subnets, isolated switches, two vmks.
	VSAN-010	Multicast performance 27.80
	VSAN-013	Storage performance stress
IOPS		Throughput MB/s	Average Latency (ms)	Maximum Latency (ms)
51.31666667	0.405		59.23133333		761.466


Two multicast, two subnets, isolated switches, two vmks. VSAN 6.2
	VSAN-021	Multicast performance 27.93
	VSAN-022	Storage performance stress
IOPS		Throughput MB/s	Average Latency (ms)	Maximum Latency (ms)
33.11666667	0.2625		90.08566667		475.3316667


esxcli vsan network ipv4 set -i vmk2 -d 224.2.3.6 -u 224.1.2.5
</file>

Switch usage graphs
{{gallery>images:vmware?switch-*.png&lightbox}}

----

http://www.vmware.com/files/pdf/products/vsan/VMware-Virtual-SAN-Network-Design-Guide.pdf

==== Testing Multicast Connectivity ====

On host 1 run the following to monitor for VSAN multicast traffic;
<file>
[root@matx01vmvh01:~] tcpdump-uw -i vmk1 -n -s0 -t -c 20 udp port 12345 or udp port 23451
</file>

On host 2 run the following to generate example VSAN multicast traffic;
<file>
[root@matx01vmvh02:~] nc -uz -s 10.2.6.82 224.2.3.4 23451
</file>

If vSAN is up and running, you should see multicast traffic from all hosts in the vSAN cluster on the same layer 2 segment.  **Some [[brocade:icx-multicast|switches]] will require static multicast groups for 224.1.2.3 and 224.2.3.4. or to have multicast forced to version 3**