CBT Fails to Flush on All VMs, Backups taking 12+ hours

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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby Gostev » Thu Dec 13, 2012 9:59 pm

This would depend on the specific issue (there are a few different border cases we have missed in testing), but in most cases it should both fix and prevent.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby matizmat » Fri Dec 14, 2012 9:16 am

Gostev wrote:Just wanted to update that we will be releasing a patch for the issues that cause this error soon (it is in final testing right now).

I look forward to this patch :)
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby mmihm@salawus.com » Fri Dec 14, 2012 6:21 pm

Same problem here! Four 2008 R2 hyperv hosts replicating vm's to two 2008 R2 hyperv hosts in our Colo. "Failed to flush tracking data before snapshot". I upgraded to 6.5, same issue. All hosts are rebooted monthly and the issue still occurs.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby jorgene » Thu Dec 27, 2012 1:18 pm

Any fix for this issue yet? having the same problem on imported VM's in a W2012 Cluster.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby Vitaliy S. » Thu Dec 27, 2012 1:52 pm

Jorgen, have you had a chance to apply our latest patch to resolve this issue?
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby jorgene » Thu Dec 27, 2012 1:57 pm

Ohh, dowloading and installing now ;) thx.
FYI. It seems like a Move of Virtual Machine Store in a Cluster also makes the CBT break.
I will apply the patch and report back.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby jorgene » Thu Dec 27, 2012 2:34 pm 2 people like this post

Hi, works correctly after applying the patch. After moving a Virtual Machine Store of a VM to Another LUN/CSV it seems like it takes longer time to backup that VM the first time (probably need to read entire VM file again) but no warnings in backup log file. All seems to work fine after the patch.

Thx !
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby dan.hoffman » Fri Dec 28, 2012 2:17 am

I must have missed something. I installed the patch, and it updated all the hosts just fine. But, I am still getting the problem. I even restarted 2 VMs and one of the hosts to test. Restarted the Veeam server and repository as well. Still getting the same issue when running replications and backups.
Anyone else?
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby Vitaliy S. » Fri Dec 28, 2012 8:17 am

Hi Dan, I guess our support should take a look at your logs after you've applied this patch to see what is the reason for CBT flush failure messages.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby jorgene » Fri Dec 28, 2012 3:31 pm

Hi again, after adding a new VM (W2008R2) and converting the VHD file to VHDX and adding it to the Cluster backup jobs on that VM now gets the same error again (CBT fails to flush) (i have applied the patch). I made a new job new backup respository but the same error.

I applied the patch again on the Veeam B&R server, and the error dissapears again.
So everytime i import a VM in the cluster i need to reapply the patch, to make the CBT error go away.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby dan.hoffman » Fri Dec 28, 2012 5:21 pm

Vitaliy S. wrote:Hi Dan, I guess our support should take a look at your logs after you've applied this patch to see what is the reason for CBT flush failure messages.

Just opened a ticket. Thanks.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby Gostev » Sat Dec 29, 2012 5:23 pm

jorgene wrote:So everytime i import a VM in the cluster i need to reapply the patch, to make the CBT error go away.

This makes no sense to me. How overwriting the existing files with the same ones can change anything at all? I recommend investigating this with the support.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby rkovhaev » Mon Dec 31, 2012 11:24 am

Dan, Jorgen,
Could you please let me know your support req. numbers, there is a possibility that old FCT driver is still in memory and we will need to manually load new FCT driver.
Another option would be scheduling a quick downtime for production or live migrate VMs(if it's a cluster) to another node and reboot affected HyperV nodes.
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby dan.hoffman » Mon Dec 31, 2012 5:25 pm

I already tried migrating two affected vms off one host and restarted the hosts then migrated the vms back, it didn't help. I even restarted the VMs just to make sure. Still getting the same error.
case: 00169668
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Re: CBT Fails to Flush on All VMs, Backups taking 12+ hours

Veeam Logoby rkovhaev » Wed Jan 02, 2013 1:07 pm

Dan, it looks like you are using cluster disk instead of cluster shared volume (CSV). Cluster disk is not supported yet, support will be added in one of the upcoming releases.
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