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jmc
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CDP with CBT mode - Warning

Post by jmc »

Hi all,

after creating a cdp job with 3 vm's i get the message CBT Mode instead of syncing on one vm. This results in the warning:

Restore point creation completed with warnings. (Failed to create restore point 05.04.2021 12:00:00 (attempt 1 out of 3)) Details: CBT mode was enabled for the following disks: Hard disk 1

what does this mean and how can it be cleaned?

thx
jeff
Everybody ask why the dinosaurs are gone - nobody ask why they are lived so long

nikolaj
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Re: CDP with CBT mode - Warning

Post by nikolaj »

Hi jmc,

CBT is a vmware technology that is utilised by VBR to create incremental backups.
The setting whether or not to use it can be controlled in the Advanced settings of VBR console:
https://helpcenter.veeam.com/docs/backu ... ml?ver=110

In your specific case it looks like there's a mismatch between this setting in VBR and the configuration parameters of a particular HDD.
Is CBT was indeed enabled for Hard disk 1 in vSphere?
https://kb.vmware.com/s/article/1020128

What are the settings for CBT in Advanced settings > vSphere of your VBR instance?

jmc
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Re: CDP with CBT mode - Warning

Post by jmc »

hello nikolaj,

you are right and i know this. but that isn't what i asked. WHY i get for one VM in a CDP job CBT mode and the other vm's are syncing? in all b&r jobs the cbt is activated also for the correct vm's with syncing.

jeff
Everybody ask why the dinosaurs are gone - nobody ask why they are lived so long

veremin
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Re: CDP with CBT mode - Warning

Post by veremin » 2 people like this post

In case of CDP, CBT mode does not refer to VMware Changed Block Tracking mechanism, it describes a case when a source proxy cannot deliver the traffic stream to target infrastructure and instead of sending blocks it starts creating a changed block map (identifying those blocks that have changed during the time period when there has been no connection to the target infrastructure).

When connection goes up, CDP sends to the target the actual content of the source blocks - those blocks that have been marked as changed ones in the block map.

Thanks!

jmc
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Re: CDP with CBT mode - Warning

Post by jmc »

hi vlademir,

thx for explanation. what i couldn't understand is, why this happened with this specific vm. the other vm's are in syncing mode. the ressourcepool, the vm-cluster and the hosts are equal. i got the error:

Code: Select all

06.04.2021 08:00:17 :: Using source proxy 192.168.65.63 for disk Hard disk 1  
06.04.2021 08:00:17 :: Using target proxy 192.168.65.63 for disk Hard disk 1  
06.04.2021 08:00:17 :: Processing disk: Hard disk 1  
06.04.2021 12:00:00 :: Restore point creation completed with warnings. (Failed to create restore point 06.04.2021 12:00:00 (attempt 1 out of 3)) Details: CBT mode was enabled for the following disks: Hard disk 1 CBT mode was enabled for the following disks: Hard disk 1 
06.04.2021 12:00:00 :: Creating crash-consistent long-term restore point at 06.04.2021 12:00:00  
06.04.2021 12:10:00 :: Restore point creation completed with warnings. (Failed to create restore point 06.04.2021 12:10:01 (attempt 2 out of 3)) Details: CBT mode was enabled for the following disks: Hard disk 1 CBT mode was enabled for the following disks: Hard disk 1 
06.04.2021 12:10:00 :: Creating crash-consistent long-term restore point at 06.04.2021 12:10:00  
06.04.2021 12:20:01 :: Restore point creation completed with errors. (Failed to create restore point 06.04.2021 12:20:01 (attempt 3 out of 3)) Error: CBT mode was enabled for the following disks: Hard disk 1  
06.04.2021 08:00:17 :: Processing disks...  
any hint or should i open a ticket?

thx jeff
Everybody ask why the dinosaurs are gone - nobody ask why they are lived so long

veremin
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Re: CDP with CBT mode - Warning

Post by veremin »

Hard to guess really, so, opening a support ticket sounds like the best idea. Not only will it allow us see the debug logs and your infrastructure, but also it will help me to draw attention of QA team to the issue reported. Thanks, Jeff!

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