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Slow network connectivity

Posted on 2013-12-28
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Last Modified: 2013-12-29
Hi, last Sunday morning I ran updates on one of my virtual servers and four virtual machines on that server. After all VMs (Hyper-V) were updated I shut them down as I normally do and then rebooted the host server which also was updated. When the systems rebooted, I noticed that there was a significant delay in the bootup of the host and especially the VMs. The host server normally takes about 10 minutes to come up all the way ... now it was taking about 30. The VMs were even worse ... taking almost an hour to boot up. The systems do run and are accessible, but are slower. This is especially noticeable on the Exchange 2007 server which gives the user the old "trying to receive information from the exchange server" when switching folders or initially logging in and even opening bigger messages. One of the machines is an Oracle server and apps that access the Oracle databases are noticeably slower. The nightly backup of the exchange server used to take approximately 4 hours and now takes 12. I also did a data drag from my computer to the C$ of all the VMs which was very slow. The drag to the host server C$ was much faster, but stil not as fast as dragging to another virtual host server. The only change to the system were the updates so I uninstalled all the updates that were installed that morning on the host server and the exchange server. This did not have a noticeable affect. The event logs don't show any new events that weren't happening before the problem.

The host server is Windows 2008 R2 SP1 ... the VMs are 2008 and Windows 7.

Thanks for your assistance.
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Question by:OGDITAdmin
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insidetech earned 2000 total points
ID: 39743649
I would start with the core host evaluation. Down all VM's...
Things to look for-
- RAID sets that are deprecated or re- generating --- this would be my first guess for the performance hit
- deprecated memory or excessive swapping to a file
- pending updates
- did you flush drives and defragment w/o VM's running

Reboot the host again... Is it running slow or fast?
Bring up one VM at a time and observe for slow down
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by:Brad Held
ID: 39743827
Check the nic properties and see if Virtual Machine Queues are enabled. If so disable them and check performance of the vms again
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Author Closing Comment

by:OGDITAdmin
ID: 39744936
It was a bad drive on the RAID5 array which is where all the VMs ride. I replaced the drive and performance went back to normal. It was weird because I always visually check the lights on all the drives on the five virtual hosts that I have every morning and normally when a drive is bad it is a steady yellow. This  drive was blinking green as usually, but about every ten seconds it would blink yellow. These are Dell servers and they don't show any events in the event viewer that I can see. Is there a way to check the health of the array without booting it down and going into the RAID configuration? It would be nice to get an e-mail when a drive goes south. Thanks again for the advice, it saved the day.
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by:Brad Held
ID: 39745135
Dell Sever Manager would be able to tell you under the storage section.
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