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RobKanjFlag for United Kingdom of Great Britain and Northern Ireland

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DC Server not responding

Dear Experts

We came across an issue with our primary Domain Controller which is now sorted however we need to get to the bottom of this issue to understand what caused the problem. If you can shed some light by asking questions and advice that will be great.

Environment/background:
Primary DC is a VM running on VMWare, secondary DC is a physical server. Both on windows server 2012 R2 Standard. DFS is setup among two of the servers and the DFS root is primary DC. We’ve replaced the physical server due to a hardware issue, prior to introducing the new physical server to the DFS the DC removal and DFS removal procedures were followed. Data stores created for VM are on a synology and attached to the VM as iSCSI targets.

Issue:
The primary DC is backing up to Azure cloud and initial backup started running at 11:30 pm but the next day logon to network failed and when looking at the server on VMWare the server only showed 1MB free space. This Server had about 100GB free space on C drive. After increasing the data store space for the VM the issue was sorted however this took sometime and rebooting of servers. In the meantime the azure backup failed as well.

Findings:
So far looking at the logs the issue has started (around 8pm) prior to the backup with the following issues.
1.      DFS replication has stopped
2.      Errors related to disk issues on primary DC

Event log errors on primary DC:
1.      Event ID 12503 – Distribution Link Tracking Client
2.      Event ID 58 – partmgr (the disk signature of disk 4 is equal to the disk signature of disk 0)
3.      Event ID 157 – Disk (Disk 3 has been suprise removed)
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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So what filled up the OS disk ?

Any Windows server which runs out of OS System disk space, will start to have issues.
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ASKER

Hi Andrew
exactly that is what I'm expecting some suggestion on, as we are not sure yet.
SOLUTION
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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