Updating Load-Balanced Client Access Servers If you are running load-balanced Client Access servers in a site then you should configure the load balancer to remove the server from the pool of hosts, and allow any existing connections to close, before you install the cumulative update. The exact steps for this will depend on the load balancing solution that you use, and you should refer to your vendor documentation for those. As each Client Access server is updated join it to the pool again and then repeat the process for the next server. In those cases the following steps will be required.
Frequently in support, we encounter several backup related calls for Exchange databases. A sample of common issues we hear from our customers are: When troubleshooting backups in Exchange we are interested in two writers — the Exchange Information Store Writer utilized for active copy backups and the Exchange Replica Writer utilized for passive copy backups.
The writers are responsible for providing the metadata information for databases to the VSS Requestor aka the backup software.
The VSS Provider is the component that creates and maintains shadow copies. At the end of successful backups, when the Volume Shadow Copy Service signals backup is complete, the writers initiate post-backup steps which include updating the database header and performing log truncation.
As explained above, it is the responsibility of the VSS Requestor to get metadata information from Exchange writers and at the end of successful backup, VSS service signals backup complete to the Exchange writers so the writers can perform post-backup operations.
The purpose of this blog is to discuss the VSSTester script, its functionality and how it can help diagnose backup problems. What does the script to? The script has two major functions: Perform Diskshadow backup of a selected Exchange database so we can exercise the VSS framework in the system, so at the end of a successful snapshot, database header is updated and log files are truncated.
We will discuss in detail what Diskshadow is and what it does. The second function of this script is to collect diagnostic data. For backup cases, there is a lot of data that needs to be collected. To get the diagnostic data you may have to manually go to different places in the Exchange server and turn on logging.
If that is not done correctly, we will miss getting crucial logs during the time of the issue. The script makes the data collection process much easier. Script requirements The current version of the script works only on Exchange servers.
The script needs to be run on the Exchange server that is experiencing backup issues. If you are having issues with passive copy backups, please go to the appropriate node in the DAG and run the script. Server1 hosts the active copy of the database.
If backups of the active copy have previously failed run the script on Server1. Otherwise run script on whichever of the remaining servers has failed previously when backing up the passive copy. Please ensure that you have enough space on the drive you save the configuration and output files.
Exchange and VSS traces, Diagnostic logs can occupy up to several GBs of drive space depending on the time taken for taking backup.
Running the script in a lab environment consumed close to 25MB of drive space a minute. The script is unsigned. On the server where you run the script you will have to set the execution policy to allow unsigned PowerShell scripts. Please see this for how to do this.
The script can be run on any DAG configuration. You can use this to troubleshoot Mailbox and Public folder database backup issues. Databases and log files can be on regular drives or mount points. Mix and match of the two will also work!Apr 28, · For example, when the SQL Server writer is in a failed state, you simply restart the SQL Server VSS Writer service and the issue is fixed most times.
Rebooting production servers two to three times per week just .
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Mar 11, · The first is the Exchange Information Store VSS writer and the second is the Exchange Replication Service VSS writer. The Information Store writer allows for the backup of active / mounted databases and the replication service writer allows for the backup of passive databases (should a replicated database model be utilized).
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In this article I will demonstrate the step by step process for installing cumulative updates and service packs for Exchange Server Cumulative updates and Service Packs should be installed in the internet-facing site first, before installing in other sites in the organization.
The first. "The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing.