Hey Folks; We are seeing some rather unique issues on the Azure environment with Ubuntu. There is intermittent blocking io on the OS Disk > 120 seconds; resulting in a kernel stack trace. We have also seen the RCU stall timeout occur. This occurs on multiple vms; but it often occurs in groups among two or more VMs. The issue occurs once or twice per day on a cluster of about 60 VMs.
We have certainly isolated many of the host issues; storage account issues, etc, with Microsoft but I wanted to get a better understanding on the changes required to support Ubuntu on Azure. Beyond the hyper-v driver and waagent; are there any unique kernel settings required on these VMs? Where any modifications to the hyper-v drivers required to support Azure? I'm trying to digest the problem more throughly from the engineering side so I can make headway on this. -John
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