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NSR critical Failed to merge VHD differencing chain
NMM 9.0.1.5, Exchange 2013
Fullbackups work fine, incremental backups do not.
Error message in nsrnmmsv.raw:
NSR critical Failed to merge VHD differencing chain
What is the problem?
regards
Bernd
ble1
2 Intern
2 Intern
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14.3K Posts
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January 19th, 2017 13:00
I don't have such setup, but based on docs and error we can assume what is going on. Doc says:
So, it seems like expected differencing disk is not found or I could imagine same error can be made if there is something else doing the backup as well (as that would break the chain). To be sure, can you check also log in event log to see if there is anything written there?
CarlosRojas
1.7K Posts
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January 20th, 2017 01:00
Hello Bernd,
Can you please check in the application information field, if you have the following variable, and what is the value?:
NSR_VSS_FULL_BACKUP Default value is Yes.
When the value is Yes, NMM initially performs a full backup and later performs incremental backups.
If the value is No, then NMM performs a copy full backup and merges the recovery snapshot with the base VHDX.
Thank you,
Carlos
armandogm
14 Posts
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January 26th, 2017 08:00
gotschy, was this resolved? If so, can you please share the solution? I am having the same issue but on NMM 9.0.x.
I searched NMM documentation and found the variable related to Hyper-V backups and my configuration was done with the client wizard so I would assume it will not include this variable? Anyhow, I am going to check the configuration again to be sure.
Thanks,
Armando
valentin_cioban
14 Posts
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March 17th, 2017 05:00
Hi , anyone found a solution for this problem ?
We are also having this problem on build 9.0.1.6 .
Please help !
Mohamed_badawy
1 Message
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May 22nd, 2017 04:00
Hi ,
I have the same problem with nw 9.1.1 and nmm 9.1.1
any solutions ??
Anonymous
5 Practitioner
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274.2K Posts
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July 11th, 2017 01:00
Hi
Was the problem resolved after so long? what's the solution?
armandogm
14 Posts
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July 11th, 2017 07:00
For the incremental, have you tried setting client retries and inactivity timeout in the action properties to 0 ?
Anonymous
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274.2K Posts
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July 13th, 2017 00:00
HI ArmandoGM
Thank you for your suggestion.
By the way, the problem that we encountered is :
nsrnmmsv NSR critical Backup of Hyper-V data files failed with error Failed to merge VHD chain. FileStream::Read error..
will setting client retries and inactivity timeout to 0 helps in this case? currently running 9.1.0.4 server and client.