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Sql server vdi api
Sql server vdi api










sql server vdi api

Review the SQL Server Errorlog to see the series of freeze and thaw activities that take place. SQL Server THAWs the frozen database and completes the backup command. Once the consumer has secured the data from the volume it uses the VDI interface to tell SQL Server that I/O can resume. Some solutions enable copy on write behavior, others split a physical mirror and other techniques can be employed by the hardware vendors. At this point the VDI consumer can do whatever action required to secure the volume snapshot. with SNAPSHOT will FREEZE the I/O for the database and report to the VDI consumer that the database I/O is frozen. TO DEVICE command for all databases in the list.īACKUP. Step #2: SQLWriter enumerates all database file locations and determines the list of databases with files on the volume. Step #1: SQLWriter (VSS Object) is loaded. (Databases with files on the volume) * 3 = Required Workers.įor the issue I worked, 500 databases results in a requirement of 1,500 threads to complete the activity. The controlling thread that accepts the BACKUP command and 2 helpers to handle VDI completion and meta data streaming activities. ) is issues it currently requires 3 threads to complete the backup. It is rare to have so many databases on a single volume but it is possible and we had a case on this very issue. The issue was a NT Backup against a single volume containing 500 SQL Server databases. Last week I worked on an interesting case.












Sql server vdi api