VM Disk Errors on 2012

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VM Disk Errors on 2012

Veeam Logoby JimTech18 » Fri Jun 28, 2013 9:03 pm

I get several VM Disk Errors reported in monitoring every time I restart my VM but can't find corresponding errors in the 2012 logs. Can someone help me locate the correct location to find the log errors so I can troubleshoot and resolve this issue.

Thanks
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Sun Jun 30, 2013 11:44 am

Hello Jim,

Do you see these VM disk errors for every VM you restart?

Thank you!
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Re: VM Disk Errors on 2012

Veeam Logoby KaterKarlo99 » Tue Jul 09, 2013 10:19 am

Hi,

i got the same issue un a W2K12 hyper-v cluster. Some of my VM's have this "VM Disk Errors" Error.
I'm interested too, to localized and fix this.

Anyone an idea?
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Wed Jul 10, 2013 1:41 am

I have just the one VM at this point. I plan to move several others from an old server but hesitate to do so until I have diagnosed these errors.

One item of note is that the errors only occur on the 3 mounted vhdx drives via SCSI controller.

Thanks
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Re: VM Disk Errors on 2012

Veeam Logoby v.Eremin » Wed Jul 10, 2013 8:10 am

Some of my VM's have this "VM Disk Errors" Error.

I’m wondering whether these disks have something in common. Or it’s just random disks that are affected by this error? Thanks.
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Wed Jul 10, 2013 9:38 am

JimTech18 wrote:One item of note is that the errors only occur on the 3 mounted vhdx drives via SCSI controller.

Can you please take a look at other VM events happened at that time?
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Thu Jul 11, 2013 2:18 pm

Vitaliy S. wrote:
JimTech18 wrote:One item of note is that the errors only occur on the 3 mounted vhdx drives via SCSI controller.

Can you please take a look at other VM events happened at that time?


Where would you like me to look? I have reviewed the event logs on both the Host and Guest and see no errors or warnings before or after the restart. But then the Veeam One monitor shows another alert. I always get a status of resolved at the time that the restart begins with "Virtual Machine was powered off" then a while after it is back up I get an alert for each .vhdx. Restarting the Host does not seem to generate the errors. I am planning on doing some additional testing, changing to IDE controller; mounting a new .vhd file both as IDE and as SCSI to see what happens. I will report back.
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Thu Jul 11, 2013 2:47 pm

I changed one of the 3 SCSI mounted .vhdx to IDE and restarted the server. Now I only get errors on the SCSI drives, not the IDE drive. Also errors reported for each drive dropped from (9) to (7).
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Thu Jul 11, 2013 9:27 pm

I was referring to events tab on the VM. Can you please tell me wha values do you have for these disks if you take a look here: PerfMon -> Hyper-V Virtual Storage Device\Error Count?
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Thu Jul 11, 2013 9:46 pm

Vitaliy S. wrote:I was referring to events tab on the VM. Can you please tell me wha values do you have for these disks if you take a look here: PerfMon -> Hyper-V Virtual Storage Device\Error Count?


On the host I found that monitor and the error count on both SCSI drives is 9 and 0 on the IDE drives.

Now I just have to figure where they are coming from, any ideas?
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Thu Jul 11, 2013 10:02 pm

Are these pass-through disks by any chance? I have found this KB article from Microsoft: http://support.microsoft.com/kb/2624495

Even though this article refers to Windows Server 2008R2, it still does look that it can be applied to Windows Server 2012.
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Fri Jul 12, 2013 2:10 pm

Vitaliy S. wrote:Are these pass-through disks by any chance? I have found this KB article from Microsoft: http://support.microsoft.com/kb/2624495

Even though this article refers to Windows Server 2008R2, it still does look that it can be applied to Windows Server 2012.


No they are VHDX disks not pass through disks. Though the end result seems to be exactly what is being described here. Since VHDX disks did not exist for 2008 HyperV I wonder if it is a similar issue with the new disk type.

Looks like I will have to raise the threshold to (10) to eliminate the false indication while still allowing indication of more serious problems. Does that sound like the best solution to this issue?
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Fri Jul 12, 2013 2:41 pm

Currently it seems like an acceptable workaround, however the number of errors will keep rising every time, as this counter only resets itself after you reboot the VM. To address this issue, I have asked our dev team to measure the number of errors per collection interval, so in v7 we will report on errors rate (number of errors per time period) and not only on the actual number of errors occurred.
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Re: VM Disk Errors on 2012

Veeam Logoby JimTech18 » Fri Jul 12, 2013 2:48 pm

Vitaliy S. wrote:Currently it seems like an acceptable workaround, however the number of errors will keep rising every time, as this counter only resets itself after you reboot the VM. To address this issue, I have asked our dev team to measure the number of errors per collection interval, so in v7 we will report on errors rate (number of errors per time period) and not only on the actual number of errors occurred.


This should not be a problem if the errors only occur on restart of the VM also, since the counters clear each time I am only seeing the same number of errors after each restart. It would be great if at least it was reported to Microsoft as a problem, doesn't mean they will ever fix it but still worth reporting. It would be great if your dev team could confirm they get the same results when mounting a VHDX as SCSI. Then we could at least know it is not just my configuration.
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Re: VM Disk Errors on 2012

Veeam Logoby Vitaliy S. » Fri Jul 12, 2013 3:10 pm

Yes, this does make sense.
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