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arcserve-KB : UDP | Disk has been surprise removed. The disk signature of disk 2 is equal to the disk signature of disk 0.

Last Update: 2018-03-22 14:42:46 UTC

Problem: Below warning message are seen inside virtual machines when doing Arcserve Host Based Agent Less Backup:


Windows events inside virtual machine:
 
Log Name:      System
Source:        partmgr
Date:          xx/xx/xxxxx x:xx:xx 
Event ID:      58
Task Category: None
Level:        Warning
Keywords:      Classic
User:          N/A
Computer:      FQDN Machine name
Description :
The disk signature of disk 2 is equal to the disk signature of disk 0.
Log Name:      System
Source:        disk
Date:         xx/xx/xxxxx x:xx:xx
Event ID:      157
Task Category: None
Level:        Warning
Keywords:      Classic
User:          N/A
Computer:      FQDN Machine name
Description :
Disk 2 has been surprise removed.

Environment: 

All versions of UDP
OS version: Windows 2012 / Windows 2012R2 / Windows 2012 Standard
Proxy Machine: (Same as backup Server or different server) 

Hyper-V Host Information:

Operating System of Hyper-V Host : Windows 2012 / Windows 2012R2 / Windows 2012 Standard
Clustered (CSV) : Yes


Cause:
UDP does VSS snapshot backup of virtual machines for data consistency and after taking snapshot, It will mount the virtual machine disk on the host server, as the mounted disk on the host server and the virtual machine disk have the same disk ID, it will cause Disk Signature Collisions and Event ID 58 ' The disk signature of disk 2 is equal to the disk signature of disk 0.'  is generated inside virtual machine

Once backup process is complete and the snapshot is deleted, there will be a Event ID: 157 seen stating 'Disk 2 has been surprise removed'

Solution:
Arcserve UDP does not have any control on this process. It is a known behavior in Windows Hypervisor environments and we can safely ignore the warnings:

Please refer Microsoft Blog below:

https://blogs.msdn.microsoft.com/virtual_pc_guy/2015/03/11/hyper-v-and-event-id-58-the-disk-signature-of-disk-2-is-equal-to-the-disk-signature-of-disk-0/

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