Since a few weeks there’s a big issue in the network. There a fysical server (HP ML380gen8) running ESXi 5.0.0 running on it. On this ESXi server a few virtual servers are running. One of them is a SBS2011 server with 18Gb Ram, 2 virtual sockets and 300Gb disk.
Every day on 12:00am. The cpu loads get high to 99% , after that the connection (also ping) is lost for about 2 minutes. I checked every possible task that may be running at that time and checked/did the following the last few weeks on the SBS2011:
- de-installed antivirus
- disabled shadow copies
- disabled backupexec agent
- checked every possible scheduled task
Nothing works. The strange thing is that this happens every day on 12:00 am. Other thing is that the system eventlog shows that at 12:00 “The Volume Shadow Copy service entered the running state.” And at 12:04: “The Volume Shadow Copy service entered the stopped state.” Thats the same period the connection was lost. But at 12am no shadow copies where scheduled. And the issue also came when shadown copies was completly disabled.
See attach performance graphics.