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vMotion vMkernels in different subnets from ESX Hosts network

jskfan
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vMotion vMkernels in different subnets from ESX Hosts network

If I configure vMotion vMkernels in different subnets from ESX Hosts will this slow the vMotion of a Virtual Machine ?

Thank you
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
what is the LATENCY, if the LATENCY is too high, the vMotion will fail with a timeout.

otherwise try it, also depends on the toplogy and network equipment in use.

A vMotion is a 1 or a 0, it either works or it does not!

Multiple nics, 1GBe and 10GBe increase vMotion speed, and also Jumbo Frames.
jskfan

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Commented:
what traffic travels through vMotion subnet ?

if ESX1 and ESX2 are in the same subnet, shared Datastore,  but vMotion vMkernel is in different subnet , and VM vMotion occurs from ESX1 to ESX2,
if I understand ESX1 will copy some files regarding the VM  to the shared datastore and ESX2 probably will upload those files to memory and cpu ..
What goes through vMotion subnets...I do not know


Regarding L3-- I believe L3 [Routing Process] always causes some delay
Jumbo Frames if they are configured just on the VLAN where vmotion is done, that can be simple...but if it has to be configured in every VLAN in the Network then it can be very complex.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
vMotion data
jskfan

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Commented:

vMotion data

Can we determine how big it can be? for instance if we have VMs that have large Resources (CPU/Memory),  and Large disks size  in case of Storage vMotion, then  we 'll need to adjust the pipe that the vmotion data will flow through..

OR

2 Physical Nics with 1 Gig each will be far enough  for any size ?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
Bigger the house pipe the more water which can flow through it.... same with data.
jskfan

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Commented:

Bigger the house pipe the more water which can flow through it.... same with data.

I know but you need first to know how big is the water flow, before you buy a pipe of certain size.
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Commented:
If you use 10GBe vMotions will be faster.

(but it's also limited by your Host specifications and their datastores).
jskfan

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Commented:
Thanks
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
np