PowerShell Script to configure iSCSI Network Cards as per Microsoft Best Practices.

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PowerShell Script to configure iSCSI Network Cards as per Microsoft Best Practices.
Hi Guys, Today i was able to achieve something exciting.I was able to automate the configuration settings for a Virtual Machine which has iSCSI networkcards connect to it using PowerShell and a utility called as nvspbind http://archive.msdn.microsoft.com/nvspbind

The Script could be run on virtual machines which have iSCSI NIC’s connected to them which are in turn connected to a NetAPP Storage.

We faced lots of performance issue’s with our SQL Virtual Machines and we had a case with PSS to solve the issue, PSS suggested to perform the below set of steps on a iSCSI Network Card of virtual machines to resolve the issue.

They Suggested for all VM’s which have an iSCSI nic attached we need to perform the following set of activities.

a) The Network Properties  for iSCSI Nics should have only “internet protocol version4”  checked and rest of all properties should be unchecked.

b) “Register this connection’s address  in DNS” should be unchecked and “Disable NetBIOS  over TCPIP” should be selected.

c) Access the advanced properties of each iSCSI Network card and set the Checksum offload for “IPV4”, “Large Send Offload”, “TCP Checksum Offload” and “UDP Checksum Offload” as DISABLED and also set the Jumbo packets to 9014 Bytes.

 

d) Run the NetSH commands to set the offload settings globally

Netsh int tcp set global RSS=Disabled
Netsh int tcp set global chimney=Disabled
Netsh int tcp set global autotuninglevel=Disabled
Netsh int tcp set global congestionprovider=None
Netsh int tcp set global ecncapability=Disabled
Netsh int ip set global taskoffload=disabled
Netsh int tcp set global timestamps=Disabled
Netsh int tcp set global netdma=disabled

 

“It was a painful task to set each of the above properties manually,”

Hence i created a script for our team to automate the entire process using wmi and a free tool from microsoft called as nvspbind which helps in binding and unbinding Network Adapter properties

Below Script works on the following assumption
a) iSCSI network cards in your VM are named as iSCSI1 and iSCSI2 (This is generally done   to provide redundancy)
b) iSCSI NICs have an IP address assignment starting with 192.
c) You have downloaded and kept nvspbind in a folder called as “c:install”
The above three assumptions can be further modified as per your environments iSCSI NIC Card naming conventions and iSCSI ip address assignment conventions and also where you find it suitable to place  nvspbind
Here’s the entire script for your reference
function Set-iSCSIConfig {
 
$colItems1 = get-wmiobject -class "Win32_NetworkAdapter" -namespace "rootCIMV2" -computername localhost
 
$colItems = get-wmiobject -class "Win32_NetworkAdapterconfiguration" -namespace "rootCIMV2" -computername localhost
 
foreach ($objitem in $colItems)
 
 
{
 
 

# Match the current $objItem with the correct $ColItems1 element.
 

 
 

 
 

$objItem1 = $colItems1| where-object{$_.Caption -eq $objItem.Caption}
 
if ($objItem.ipenabled -eq "true" -and ($objitem1.netconnectionid -match "iscsi")) {
 
 

 
 

 
 

<#Uncheck Register This Connection in DNS#>
 

 
 
 

$objitem.SetDynamicDNSRegistration($false)
 
<#Disable NETBIOS over TCPIP for iSCSI1#>
 
$adapter=(gwmi -query "select * from win32_networkadapter where netconnectionid= 'iscsi1'").deviceid
 
([wmi]".rootcimv2:Win32_NetworkAdapterConfiguration.Index=$adapter").SetTcpipNetbios(2)
 


<#Disable NETBIOS over TCPIP for iSCSI2#>
 

 
 
 

$adapter=(gwmi -query "select * from win32_networkadapter where netconnectionid= 'iscsi2'").deviceid
 
([wmi]".rootcimv2:Win32_NetworkAdapterConfiguration.Index=$adapter").SetTcpipNetbios(2)
 
<#Here Below we use nvspbind to disable all properties for iSCSI NIC except ipV4#>
 
Set-Location "C:installnvsp"
 
$nic = $objitem1.netconnectionid
 
.nvspbind.exe /d "$nic"ms_tcpip6
 
.nvspbind.exe /d "$nic"ms_server
 
.nvspbind.exe /d "$nic"ms_lltdio
 
.nvspbind.exe /d "$nic"ms_rspndr
 
.nvspbind.exe /d "$nic"ms_msclient
 
.nvspbind.exe /d "$nic"ms_pacer
 
 
}
 
}
 
 

<#Below we set the advanced property #>
 

 
 

 
 

$GuidSet = Get-ItemProperty "HKLM:SYSTEMCurrentControlSetservicesTcpipParametersInterfaces*" | ?{$_.ipaddress -match "192"} | select pschildname,ipaddress
 
$path1 = Get-ItemProperty "HKLM:SYSTEMCurrentControlSetControlClass{4D36E972-E325-11CE-BFC1-08002BE10318}*" |?{$_.NetCfgInstanceId -match $guidset[0].pschildname} | select -ExpandProperty pspath
 
$finalpath=$path1.replace("Microsoft.PowerShell.CoreRegistry::HKEY_LOCAL_MACHINE","HKLM:")
 
Set-itemproperty $finalpath -name "*JumboPacket" -value 9014
 
Set-itemproperty $finalpath -name "*LsoV2IPv4" -value 0
 
Set-itemproperty $finalpath -name "*LsoV2IPv6" -value 0
 
Set-itemproperty $finalpath -name "*TCPChecksumOffloadIPv4" -value 0
 
Set-itemproperty $finalpath -name "*TCPChecksumOffloadIPv6" -value 0
 
Set-itemproperty $finalpath -name "*UDPChecksumOffloadIPv4" -value 0
 
Set-itemproperty $finalpath -name "*UDPChecksumOffloadIPv6" -value 0
 
Set-itemproperty $finalpath -name "*IPChecksumOffloadIPv4" -value 0
 
$path2 = Get-ItemProperty "HKLM:SYSTEMCurrentControlSetControlClass{4D36E972-E325-11CE-BFC1-08002BE10318}*" |?{$_.NetCfgInstanceId -match $guidset[1].pschildname} | select -ExpandProperty pspath
 
$finalpath=$path2.replace("Microsoft.PowerShell.CoreRegistry::HKEY_LOCAL_MACHINE","HKLM:")
 
Set-itemproperty $finalpath -name "*JumboPacket" -value 9014
 
Set-itemproperty $finalpath -name "*LsoV2IPv4" -value 0
 
Set-itemproperty $finalpath -name "*LsoV2IPv6" -value 0
 
Set-itemproperty $finalpath -name "*TCPChecksumOffloadIPv4" -value 0
 
Set-itemproperty $finalpath -name "*TCPChecksumOffloadIPv6" -value 0
 
Set-itemproperty $finalpath -name "*UDPChecksumOffloadIPv4" -value 0
 
Set-itemproperty $finalpath -name "*UDPChecksumOffloadIPv6" -value 0
 
Set-itemproperty $finalpath -name "*IPChecksumOffloadIPv4" -value 0
 
Netsh int tcp set global RSS=Disabled
 
Netsh int tcp set global chimney=Disabled
 
Netsh int tcp set global autotuninglevel=Disabled
 
Netsh int tcp set global congestionprovider=None
 
Netsh int tcp set global ecncapability=Disabled
 
Netsh int ip set global taskoffload=disabled
 
Netsh int tcp set global timestamps=Disabled
 
Netsh int tcp set global netdma=disabled
 
 
}
 
 

Set-iSCSIConfig
 

 

 

Once you Run this script you would see that the iSCSI NIC’s are indeed set as per Microsoft Best practices 🙂

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