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itmicro73
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Backup CBT activated but very long

Post by itmicro73 »

here I encounter a problem on an environment ESX5.5 I have a VM under SBS2011 with veeam backup and replication installed, I make a backup to my synology.
a VM estimated at 600GB, the first backup takes 12h, it's normal.
But then the incrementals also take 12h! Why ? I do not understand ! the job ends, however, without errors

I apologize for my English translation

Andreas Neufert
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Re: Backup CBT activated but very long

Post by Andreas Neufert »

Please check the statistics. Go to the Job run in the History (left menue at bottom). Then look at the job run. Click on the VM. Then on the right side you should see specific information for the VM. There it should say something along the line "Using Change Block Tracking" or it says can not use change block tracking.

My guess is that for what ever reason something is wrong with change block tracking and we use snap ans scan backup mode (fallback) which read 100% of the data again and detect the changes.

itmicro73
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Re: Backup CBT activated but very long

Post by itmicro73 »

https://ibb.co/vBRgDWy

however I do not have the impression, I leave you the screenshot

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Re: Backup CBT activated but very long

Post by Gostev »

You didn't click on the VM.

itmicro73
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Re: Backup CBT activated but very long

Post by itmicro73 »

and tonight the backup took only 14 minutes for an incremental 4GB

itmicro73
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Re: Backup CBT activated but very long

Post by itmicro73 »

Tonight again the backup is very long 12% in 1:30.
It's amazing

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Re: Backup CBT activated but very long

Post by Andreas Neufert »

Can you please provide the screenshot as requested.

itmicro73
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Re: Backup CBT activated but very long

Post by itmicro73 »

https://ibb.co/7CcLXwJ

here is the picture of the job is good for you?

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Re: Backup CBT activated but very long

Post by Andreas Neufert »

THis is strange. By default you should see the information here that CBT is used.
Can you please double check that withint the backup job - storage - Advanced - VMware the change block tracking and the second setting within cbt is enabled.
See here:
https://helpcenter.veeam.com/docs/backu ... vmware.png

If this is the case, please open a Veeam support case and upload logs. Our support can potentially identify why CBT is not working or was never enabled.

It is important that the VM has no VMware Snapshot present so that Veeam can enable CBT. Maybe this is the issue?

itmicro73
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Re: Backup CBT activated but very long

Post by itmicro73 »

Thin then, I'm French and I can not understand your last message and your advice apparently I need to check the configuration of work. For VMware I did not understand everything

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Re: Backup CBT activated but very long

Post by itmicro73 »

I enabled a function in storage then advanced VMware guest quiescence tools

veremin
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Re: Backup CBT activated but very long

Post by veremin »

Based on the screenshots provided, CBT was used actually - see [CBT] sign.

Anyway, I recommend you reaching our support team to speed up investigation process.

Thanks!

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Re: Backup CBT activated but very long

Post by itmicro73 »

On my other backup of a Windows 2012 on a vm, when it indicates the following error, I installed the vmware tools:
03:02:16 :: Failed to index guest file system. Veeam Guest Agent is not started

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Re: Backup CBT activated but very long

Post by veremin »

Kindly, submit a ticket with our support team and let them confirm your environment. Thanks!

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