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P51F
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Slow replication

Post by P51F » Jan 28, 2019 9:24 am

Hi,
We have some problems with our VMx replication with Veeam B&R 9.5.
It is very slow, we replicate 16VMs over a 1Gbs link to a NAS.
You can read the detail of a VM replication below :

Code: Select all

27/01/2019 23:42:09 :: Queued for processing at 27/01/2019 23:42:09  
27/01/2019 23:42:09 :: Required backup infrastructure resources have been assigned  
28/01/2019 06:54:06 :: VM processing started at 28/01/2019 06:54:06  
28/01/2019 06:54:06 :: VM size: 160,0 GB  
28/01/2019 06:54:07 :: Discovering replica VM  
28/01/2019 06:54:07 :: Getting VM info from vSphere  
28/01/2019 06:54:15 :: Creating VM snapshot  
28/01/2019 06:54:26 :: Preparing replica VM  
28/01/2019 06:54:31 :: Processing configuration  
28/01/2019 06:54:39 :: Creating helper snapshot  
28/01/2019 06:54:49 :: Using source proxy VMware Backup Proxy for disk Disque dur 1 [hotadd]  
28/01/2019 07:04:12 :: Unable to hot add source disk, failing over to network mode...  
28/01/2019 07:04:12 :: Using target proxy VMware Backup Proxy for disk Disque dur 1 [hotadd]  
28/01/2019 07:08:07 :: Using source proxy VMware Backup Proxy for disk Disque dur 2 [hotadd]  
28/01/2019 07:22:34 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 07:22:46 :: Unable to hot add source disk, failing over to network mode...  
28/01/2019 07:22:46 :: Using target proxy VMware Backup Proxy for disk Disque dur 2 [hotadd]  
28/01/2019 07:22:53 :: Cannot find dirty block information in the previous restore point, CBT will not be used  
28/01/2019 07:22:53 :: Disque dur 1 (40,0 GB) 19,7 GB read at 66 MB/s (1:18:30)
28/01/2019 07:41:08 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 07:41:10 :: Disque dur 2 (120,0 GB) 2,3 GB read at 40 MB/s (1:00:23)
28/01/2019 07:59:28 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 08:17:49 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 08:36:07 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 08:40:24 :: Unable to hot add target disk, failing over to network mode...  
28/01/2019 08:41:49 :: Removing VM snapshot  
28/01/2019 08:42:00 :: Deleting helper snapshot  
28/01/2019 08:42:21 :: Swap file blocks skipped: 1,2 GB  
28/01/2019 08:42:21 :: Deleted file blocks skipped: 136,8 GB  
28/01/2019 08:42:23 :: Finalizing  
28/01/2019 08:42:29 :: Busy: Source 69% > Proxy 33% > Network 48% > Target 50%  
28/01/2019 08:42:29 :: Primary bottleneck: Source  
28/01/2019 08:42:29 :: Network traffic verification detected no corrupted blocks  
28/01/2019 08:42:29 :: Processing finished at 28/01/2019 08:42:29
I think there is a problem with CBT that cause this slowness.
So I reset the CBT on this VM (using this https://www.vmadmin.co.uk/resources/36- ... ing-off-vm), no success.
Can you help me ? Did I Forget something ?
Thank you

foggy
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Re: Slow replication

Post by foggy » Jan 28, 2019 10:30 am

Hi Pierre, it also fails to use hotadd on both sides, so I'd let our engineers to review the logs for the reason.

P51F
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Re: Slow replication

Post by P51F » Jan 28, 2019 12:43 pm

Hi, do you means I have to open a case ?

foggy
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Re: Slow replication

Post by foggy » Jan 28, 2019 12:51 pm

Yes, contacting technical support would be the most effective step in this case.

P51F
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Re: Slow replication

Post by P51F » Jan 28, 2019 12:56 pm 1 person likes this post

Ok, thank you I will do that et let you know about results.

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