vm unable to boot os

I have 2 vms running on esxi 5.5.0 Server1 and Server2. Server1 had problems so we restarted the server. We found that when server1 that is restarted it just continues to boot os but unable to do so. We restarted server2, also noticing that server1 one was able to boot as well. After a while both were ok. Both server are windows server 2012

I need to find the root cause of this issue what should i be looking at? What should i do to solve this issue?
Member_2_6474242Senior Systems AdministratorAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have any error messages, it would be good to start with error messages ?

Can we confirm, it was virtual machine Guests that did not boot ? e.g. start Windows 2012, and have a login screen ?

What resolved the issue in the end ? I assume both Windows 2012 servers are now running ?
Member_2_6474242Senior Systems AdministratorAuthor Commented:
Hi Andrew

There were no error messages as the vm kept on loading without any errors (It just said loading), once the other server was restarted all was fine. Currently is ok but i need to find out what happened. What caused this behavior. I would say restart of vm on both servers resolved this issue. Both windows servers are running fine now.
Member_2_6474242Senior Systems AdministratorAuthor Commented:
Hi Andrew

If i want to find error messages where exactly am i supposed to look at
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So you selected Power On and there was no error ?

Is this VMware vSphere (ESXi) ?

You have two ESXi servers ?

The issues was with the VM starting in the console ?

do you use local or shared storage, e.g. NAS, iSCSI SAN ?

You are really going to have to give us more information to aide you hear, otherwise we will just be guessing ?
Member_2_6474242Senior Systems AdministratorAuthor Commented:
Once the server was restarted there was no error. Yes this is a vmware ESXI. We have only one ESXI server. Yes the issues were with the VMs starting in the console. We have RAID 5 non ssd drive with a capacity of 3.27TB with 454.09GB free. Its a hp serial attached scsi disk and all vms are stored there.
The server that holds the vm is HP Proliant DL380p Gen8. CPU cores 12 cpus x 2.493Ghz
RAM shows as 35799MB used with a capacity of 49117.38MB.
Murali SripadaCommented:
The question I have is how is server2 reboot fixed the server1 reboot loop.. Is this coincidence.. I don't know.. Are those vms has any shared disks? Or clustered?

You can check the vmware.log for each respective vm datastore folder along with hostd log under var/run/log..

The vmware log might be rotated as it rotates on every reboot so better check old logs which might throw some light..
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So if you powered on the VMs, and the VMs powered on okay.....the ESXi HYpervisor started the VMs okay...

But the VM did not get to a Login Prompt?

It could have been completing updates, the storage (RAID 5) could be too slow....

Are VMs running on snapshots, check my EE Article

HOW TO: VMware Snapshots :- Be Patient

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