I have an Exchange 2010 Server running on Windows 2008 R2 (virtual environment - VMWare)
The server has 2 vcpus, 16gb ram and it is doing Mailbox, CAS and Hub Transport with around 100 mailboxes... it has been ticking over quite nicely until.....
Just recently i have noticed that is has started really chugging - logging on you can see that the CPU usage is flatlining at 100% for a couple of hours at a time and then goes back to the usual peaks and troughs for a while before maxing out again.
When the CPU usage is at 100% the description of the process that seems to be causing it is NT Kernel & System which, having googled it, i cant seem much info on relating to a similar setup.
It is getting to the point where it is really effecting general mail flow and our users are complaning about OWA is painfully slow. Backups (using Veeam) are taking 9 hours as apposed to 3.
Nothing obvious is reported in the event logs.....
Any one seen anything similar or suggest any ways of troubleshooting this?