There are instances when snapshots are fail due to an agent's VSS writers being in a failed state but it is impossible or not desirable to restart the server until at least after business hours.
Solution:An alternative solution other than restarting the server is to restart the associated services for each of the VSS writers showing up in a failed state by following the steps below:
- Find each of the VSS writers in a failed state by using the command in command prompt (Run As Administrator) - ' vssadmin list writers '.
- Mark and copy all the failed VSS writers.
- Find the VSS writer's associated Service Display Name in the table below and restart the service.
- To confirm the status has changed Stable with no Error - type - vssadmin list writers
- Run another Backup/snapshot.
- If the VSS writers fail again, it would be necessary to restart the server.
|VSS Writer||Service Name||Service Display Name|
|ASR Writer||VSS||Volume Shadow Copy|
|BITS Writer||BITS||Background Intelligent Transfer Service|
|COM+ REGDB Writer||VSS||Volume Shadow Copy|
|DFS Replication service writer||DFSR||DFS Replication|
|DHCP Jet Writer||DHCPServer||DHCP Server|
|FRS Writer||NtFrs||File Replication|
|FSRM writer||srmsvc||File Server Resource Manager|
|IIS Config Writer||AppHostSvc||Application Host Helper Service|
|IIS Metabase Writer||IISADMIN||IIS Admin Service|
|Microsoft Exchange Writer||MSExchangeIS||Microsoft Exchange Information Store|
|Microsoft Hyper-V VSS Writer||vmms||Hyper-V Virtual Machine Management|
|NTDS||NTDS||Active Directory Domain Services|
|OSearch VSS Writer||OSearch||Office SharePoint Server Search|
|OSearch14 VSS Writer||OSearch14||SharePoint Server Search 14|
|Registry Writer||VSS||Volume Shadow Copy|
|Shadow Copy Optimization Writer||VSS||Volume Shadow Copy|
|SPSearch VSS Writer||SPSearch||Windows SharePoint Services Search|
|SPSearch4 VSS Writer||SPSearch4||SharePoint Foundation Search V4|
|SqlServerWriter||SQLWriter||SQL Server VSS Writer|
|System Writer||CryptSvc||Cryptographic Services|
|TermServLicensing||TermServLicensing||Remote Desktop Licensing|
|WINS Jet Writer||WINS||Windows Internet Name Service (WINS)|
|WMI Writer||Winmgmt||Windows Management Instrumentation