SMB MultiChannel Connection Issue

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i have 2-node cluster - server 2012r2 - 2 teams of 2 nics each , 2 additional nics used mpio san.  one team used virtual machines only.  the other cluster communications.



the cluster communications team has 3 interfaces configured different vlans.  cluster communication , live migration vlans non-routable.  the management vlan routable; connects dns, etc.

with no smb shares connected/defined system still shows smb multichannel connections using link-local addresses (for cluster communications?).  it correctly sets connections between client , server on non-routable links.  for routable network sets 'selected' false 1 sets other true; 100.104 network can't 101.97 or .98 networks.

i think setup client/server connection on 104 network doesn't.  the smbclient , smbserver configurations defaults.

here smb client , server network interfaces both nodes:


these errors related (i think) (or separate issue):

the same error occurs on 101.98 network.

firewalls disabled.  there's no anti-virus.  windows updates current of last week (no optional updates have been installed).  i've used port query tool verify ports listening.

dell equallogic hit installed hp's system management software.

only management vlan has gateway configured , dns servers configured.  ipv6 disabled on all.  netbios disabled.

if create share 1 node, smb multichannel sets correctly other node not:

node interfaces

no netbios; using automatic metrics; no wins; protocol bindings on teams match except 1 protocol out of order on second node (but disabled on both - not sure if binding order matters smb - used get-netadapterbinding -name 'nic name' -allbindings.  it show wins , netbios enabled though both disabled in adapter settings above).

any ideas or correcting appreciated.



hi greg_2009，

thanks post.

since few shortcuts broken, don't know what's idea.

based on understanding, want disable smb multichannel between 2 cluster nodes?


smb multichannel seems enable between 2 cluster nodes.


https://blogs.msdn.microsoft.com/clustering/2014/06/05/cluster-shared-volume-performance-counters/

https://blogs.msdn.microsoft.com/clustering/2013/12/02/cluster-shared-volume-csv-inside-out/
if want disable smb multichannel, can use following powershell cmdlets:
on smb server side:

set-smbserverconfiguration -enablemultichannel
$false

on smb client side:

set-smbclientconfiguration -enablemultichannel
$false

note: disabling feature on either client or server prevent systems using it.

https://blogs.technet.microsoft.com/josebda/2012/06/28/the-basics-of-smb-multichannel-a-feature-of-windows-server-2012-and-smb-3-0/

for error,  transfer data on smb using rdma-capable network adapters, rdma connections may fail tcp.  install update 2919355 have check.

https://support.microsoft.com/en-us/kb/2925980

best regards,

mary dong

please remember mark replies answers if , unmark them if provide no help. if have feedback technet subscriber support, contact tnmff@microsoft.com.



Windows Server  >  File Services and Storage



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