VMware Cloud Community
jesse_gardner
Enthusiast
Enthusiast

VMotion Exchange 2007 caused issue?

I put a host into maintenance mode in a fairly small cluster: 4 hosts, going down to 3, because of critical hardware concerns on one. One of our big Exchange 2007 mailbox server VMs (18 gb RAM hosting 2400 mailboxes) was the last to VMotion off the host. When it did, it stopped responding to clients. Everyone's Outlook was disconnected. The operating system (Windows 2008 x64) seemed to be functioning fairly well, though a little slow. Store.exe was taking almost all of the CPU. From a VMware perspective, there was a small amount of ballooning and swapping for a little bit until memory sharing relieved that.

Rebooting the VM resolved the issue.

Has anyone seen anything like this with Exchange, or can I write it off as Exchange being very sensitive to memory balloon, and should create a reservation?

Reply
0 Kudos
7 Replies
msemon1
Expert
Expert

Is your Exchange 2007 cluster setup with CCR? If so you should not be using VMotion. Vmotion is not supported in clustered systems. For fail-over and redundancy you failover to the other node within Exchange. For our mailbox servers we have 4 VM's on 2 ESX hosts. For updates /maintainence you just failover to the other pair of VM's on the second ESX box. Exchange is installed on local VMDK's with RDM's for mailboxes and remote storage.

-Mike

Reply
0 Kudos
jesse_gardner
Enthusiast
Enthusiast

Thanks Mike. We are not using CCR, however, just a straightfoward unclustered environment.

Reply
0 Kudos
AndreTheGiant
Immortal
Immortal

VMware Tools are uptodate?

You network is fine (do you lost only one ping)?

The hosts have similar power (similar CPU and Memory type)?

Andre

Andrew | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
Reply
0 Kudos
jesse_gardner
Enthusiast
Enthusiast

Andre,

Yes, the VMware Tools are up to date for the host version any way.

Network works for us as it always does. 1-2 dropped pings. I was able to remote desktop to the server immediately afterwards, though it was slow because store.exe was consuming the CPU.

Hosts are identical in all ways but serial #, etc.

Thanks,

Jesse

Reply
0 Kudos
AndreTheGiant
Immortal
Immortal

Do you have enough resources on the destination hosts?

How many cores do you have? How many vCPU is the VM using?

Andre

Andrew | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
Reply
0 Kudos
PxPxger
Contributor
Contributor

I recently ran into the same issue as the original poster when I put one of our servers into maintenance mode, I couldn't connect to the Exchange Server for a few seconds. Users then got prompted for a user name/password and had to restart their outlook clients. Our Exchange Environment involves a CAS server and a Mailbox server no clustering. Any best practices or helpful hints why this occurred? Finally to fix the issue we had to reboot the server.

Reply
0 Kudos
Samikouk
Contributor
Contributor

I have always had Outlook dropping if I VMotion Exchange server from one host to another (we don't have anything special setup), it keeps prompting users for their passwords. I was wondering if anyone found a solution for this. It means I can't do any host maintenance during working hours.

Reply
0 Kudos