mega slow connections to exchange
Ok, after our mail storm the other day we've got a new exchange 2010 server running in co-existance with our 2003 server and connections are horrendously slow.
The new server itself seems fine, it sat using about 90% ram at all times but that is understood to be a normal situation. It is on a VMware ESXi box
The settings are as follows:
C: system drive on a 10k array 35gb
E: database drive on a 15k array 300gb
1 network card
the users complain of delays of up to 5 minutes when performing operations within outlook, at no point does anything actually time out/error but the informational "outlook is trying to request data from the exchange server" pops up occasionally. The actual operation doesn't seem to make a difference - for example sometimes swapping between delegated mail boxes takes 5 minutes, sometimes it is instant, sometimes opening a message takes 5 minutes, sometimes it is instant, etc. The average responses in the connection status box for directory operations to the exchange server seem quite slow, around 5k-15kms, operations to the DCs take 0-60ms.
I've run the performance analyser. I'm getting errors as follows:
! top 6 users account for 99% of MAPI cpu usage
X Potential issue with RPC activity found
X The Exchange Server User Monitor (ExMon) RPC data indicates that clients are performing online operations. Online operations for MAPI operation "QueryRows" account for 50.62% of the processor usage devoted to processing RPC requests. When a single MAPI operation type is responsible for a large percentage of the load, this may be an indication that the user is running an application that is behaving poorly.
X Slow Extensible Storage Engine Calls
X Slow Calls to Jet: Long wait time in function call to Jet: A function call to 'JetOpenTable' took longer than the threshold value of 2.5 seconds to complete. The call took 5.21 seconds. This delay occurred at 08/28/2013 10:00:45. The calling thread ID was 6692.