UPDATE (2015-Oct-02): The problem has finally been fixed! Took nearly 2 years, but here's a link to the KB article. The fix is in the September 2015 CU for Lync Server 2013. The cause is "because the topology snapshot was recomputed multiple times by the Response Group Service." Thanks to @sublimeashish for telling me.
We have a customer who is about to migrate from Lync 2010 to Lync 2013. They've got a few lightly loaded Lync 2013 Enterprise Edition pools with 3 servers each. All are running Windows 2008 R2 Standard Edition on VMWare. All patches are up-to-date.
Microsoft is actively working to resolve the issue, and I will post a permanent solution for all to see as soon as one becomes available.
UPDATE: Thanks to @dannydpa on Twitter, it appears the trigger may be Lync topology publishing. I confirmed this by updating the topology and publishing it. Less than 10 minutes later, all the servers processor utilization spiked. Recycling the aforementioned apppools resolved the issue.
To help others with this issue, I've created a little Powershell script that will recycle the LyncIntFeature and LyncExtFeature app pools for all Lync servers. For the script to work, you need to make sure that remote management is enabled on all Lync servers. On Windows Server 2012, this is on by default, but in Windows 2008 R2, you need to log on locally and run: Enable-PSRemoting -Force before running the script.
$WebPools = (Get-CSService -WebServer).PoolFQDN
ForEach ($Pool in $WebPools)
{
$PoolMembers = (Get-CSPool $Pool).Computers
Foreach ($Computer in $PoolMembers)
{
Write-Host "Resetting LyncExtFeature and LyncIntFeature app pools on $Computer"
$Session = New-PSSession -ComputerName $Computer
Invoke-Command -session $Session -ScriptBlock {Restart-WebAppPool LyncExtFeature}
Invoke-Command -session $Session -ScriptBlock {Restart-WebAppPool LyncIntFeature}
Remove-PSSession $Session
}
}
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