The error message "the semaphore timeout period has expired" can occur in different situations:
- during backup when Acronis Backup is actively writing files to a network storage
- during backup or replication to tape
'The semaphore timeout period has expired' is a network and in some situations a tape hardware error.
Microsoft has published a detailed Knowledge Base article available at http://support.microsoft.com/kb/325487 that discusses this particular error and a series of related messages. If you are encountering this message we recommend working through this article.
The following Microsoft KB article can also be helpful if you’re experiencing "the semaphore timeout period has expired" and the system in question is running Windows 2003: The processor load is not distributed across multiple processors on a computer that is running Windows Server 2003, Windows 2000 server, or Windows NT 4.0.
In case the error occurs during backup or replication to tape, usually, a Semaphore Timeout error can be associated to the tape drivers, defective SAN switches or other interfaces used for tape connection. Please ensure that hardware is working without errors, updade tape drivers and Acronis software and make sure writing to tape with original Tape Tools (provided by your manufacturer: HP, Dell etc.) does not produce the same error. Otherwise, contact the manufacturer.
If these instructions do not help, please contact Acronis Customer Central with the following information:
- exact modell of the tape/NAS device, tape driver/adapter versions
- Process Monitor log collected during failing backup/replication
- Network protocoll with Wireshark, if applicable
- Collect System Report from the machine in question: see instruction for Acronis Backup 11.5 Generating System Report, if this fails for any reason, you can use this AcronisInfo Utility