Vmware vmotion on management network card?


We would like to use vmotion on our management network card, for ease of management this also resides on the production network ( same ip range ). Having vmotion on production, would this cause an issue ?

Our servers only have 6 nics ( two for iscsi ) 1 for management and vmotion  and 3 for vm's.

I would like to keep the management interface on production for ease of management

Any recommendations. ( I don't want to use less than 3 cards for vm's, as our vm's are pretty network intensive)

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Matt VCommented:
We have all of our nics on the same network, all trunk ports and the vMotion interface is on the same physical NICs as the management and other interfaces.  All the vSwitches are on the same physical NICs.

We see no issues with performance etc.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
best practice is to use a separate nic and network for vMotion. However, as mattvmotas has suggested, real world situations play a part, and we've installed many installs using the same production network for vMotion without issue.

it's often stated to keep it seperate, like heartbeat private communications in a cluster arrangement, just in case your production network is so busy, that vMotion communications get lost! (unlikely!).

you could use Trunks and VLANs for all Six NICs. and send traffic down different VLANs for vMotion, iSCSI, and VMs.

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pancho15Author Commented:
3 esxi servers with the following vswitches

Management (vmotion) same network and ip as production
Iscsi  (isolated San network )

Should I vlan management and vmotion?

Any other recommendations ( 3 esxi hosts each with 6 nics, licensed for vmotion ) one esxi host holds an additional network (dmz) dedicated nic
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Matt VCommented:
We have 4 hosts, use FC so no Storage vSwitch, but everything else is on the trunked NICs.. each host has 6 NICs in ours as well.   We do our backups using the VDDK and or vCenter is on one of the hosts and even during a full blown backup session we still do not hit the network hard enough to prevent a vMotion.

So it really depends on how often you are going to be vMotioning while using the network intensely (sp?).

If you find the vMotion is causing issues, take 1 NIC from each host, normal vMotion is only memory and storage vMotion over 1GB should still be pretty quick.
Danny McDanielClinical Systems AnalystCommented:
I'm just curious if you have checked the historical performance charts to see if your vm's have actually come close to consuming the equivalent bandwidth of two uplinks???  If so, what are these vm's running that they are using so much bandwidth?
pancho15Author Commented:
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