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Questions:<br />
<br />
1. Shared storage or local disk?<br />
2. What is the network architecture in front of the server? 10 GB? 1 GB? <br />
3. Can you check switches to see if ports are flapping/dropping for hypervisor itself?
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1. 3x ESXi version 6 in cluster connected to storage Dell PowerVault MD3220 with 3x LUNs<br />
2. each ESXi host has 2x 1GB for management and 2x 1GB for virtual servers<br />
3. not sure how can I check on vmware. Cisco switches are fine without errors
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1.- Take a clone of your VM and change it's IP settings, and try to fix it on the clone<br />
2.- Reinstall vmtools<br />
3.- Delete the network drivers and recreate them using vmxnet3 drivers <br />
4.- Check that you haven´t got Latency Sensitivity set on High on the VM Options, Advanced (if you do, put it in Normal)<br />
5.- Start up the VM and run some extensive tests to see it you got it fixed<br />
6.- Apply what you have learned to your Production VM.
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Any reports or performance issues with VM by vCenter? <br />
Any snapshots/backups taking place? <br />
Is there a pattern to this or is it random?
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Check your CPU usage in the VM. how many CPU and how ram did you give to both machines, are they running off the same server? What the server specs?<br />
<br />
You might need to increase RAM/CPU if one of the VMs hitting a high CPU usage causing it to freeze and taking twice as long as it should be. Same if you are giving the VMs too much resources leaving the host to starve to keeping up with the servers.
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Wow As I was reading this thread I have seen that all the help this question has received. So many different aspects were discussed and all of them are great and to the point. This is one reason I prefer EE over other forums .Great job guys.<br />
<br />
If I had the issue I would first look into <b>Snapshots</b>. They can be a disaster. If you have snapshot and you don't manage them they can take up all your space and give you all kind of issues similar to what you are facing.<br />
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2nd : I will check the CPU/MEM utilization. If it is within the range then look for <b>swaping and ballooning </b>. Those are good indications.<br />
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3rd: <b>Update your VMware tools and Hardware version of your VM</b>. If your cluster is running with all ESXI 6.0 then preferably Ver 11 if you have mix match hosts then Version 10.<br />
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If all these have been already taken care and you still facing issue then we need to look into some other aspects.<br />
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Hope that helps and once again great work guys.<br />
<br />
Thanks
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What vNic are you using make sure you are using VMXNET3 since E1000 can cause problems with guest OS and host..
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<div class="content wysiwyg-content">
Dear All,<br />
&nbsp;I have two virtual machine that keeps constantly freezing for some days, usually every second day.<br />
Others virtual servers are fine and there are no problems. <br />
<br />
First virtual machine is Windows 2008 server with SQL and SAP, NOD and vmtools. This machine works fine for long time. Second machine is Windows 2008 R2 with vSphere server 6, NOd and vmtools. This machine starts freezing after upgrade vSphere server 5.0 to 6.0. Both server lost ping and when I try to log in the screen freeze, so I have to make HARD RESET. If I dont login, after lost ping, I can shut down them via cmd (shutdown /r /t /m). Sometimes they are in blueScreen when they starting.<br />
<br />
After hours of trying to figure out what could be the cause of this problem I decided to ask if anyone had an idea ? Of course I also searched intensively the web but I was unable to find any hint.<br />
<br />
Thanks a lot in advance for any hint or help !<br />
iczas
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Dear All,
 I have two virtual machine that keeps constantly freezing for some days, usually every second day.
Others virtual servers are fine and there are no problems. 

First virtual machine is Windows 2008 server with SQL and SAP, NOD and vmtools. This machine works fine for long time. Second machine is Windows 2008 R2 with vSphere server 6, NOd and vmtools. This machine starts freezing after upgrade vSphere server 5.0 to 6.0. Both server lost ping and when I try to log in the screen freeze, so I have to make HARD RESET. If I dont login, after lost ping, I can shut down them via cmd (shutdown /r /t /m). Sometimes they are in blueScreen when they starting.

After hours of trying to figure out what could be the cause of this problem I decided to ask if anyone had an idea ? Of course I also searched intensively the web but I was unable to find any hint.

Thanks a lot in advance for any hint or help !
iczas

vmware freezing virtual machine

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Microsoft Virtual Server was a virtualization solution that facilitated the creation of virtual machines on the Windows XP, Windows Vista and Windows Server 2003 operating systems. Virtual machines are created and managed through a web-based interface that relies on Internet Information Services (IIS) or through a Windows client application tool called VMRCplus. Features included Linux guest operating system support, Virtual Disk Precompactor, symmetric multiprocessing (SMP), x64 host operating system support, the ability to mount virtual hard drives on the host machine and additional operating systems support, including Windows Vista, and a volume shadow copy writer.

Microsoft Virtual Server

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.