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SQL Server Books online defines BACKUPIO as “Occurs when a backup task is waiting for data, or is waiting for a buffer in which to store data. This type is not typical, except when a task is waiting for a tape mount.”
BACKUPIO is not specifically an disk IO wait measure. And should not be used in isolation as an IO performance measure. In the description below , the context is other SQL Perfmon counters or wait types are within an acceptable range.
A few issues to consider and approaches to minimizing BACKUPIO
1)BACKUPIO is not a IO performance measure
2) If backing up to disk – check % Disk Time on the destination drive. If persistently high talkto the Disk\SAN administrator for disk bottleneck issues
3)If backup to tape check backup infrastructure
4)If backup over network , network latency will manifest as BACKUPIO. Talk to network administrator
Source:Jack Vamvas (http://www.sqlserver-dba.com)
Author: Jack Vamvas (http://www.sqlserver-dba.com)
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