Monitoring sbspaces

You can monitor the effectiveness of I/O operations on smart large objects. For better I/O performance, all smart large objects should be allocated in one extent to be contiguous.

For more information about sizing extents, see Sbspace extents.

Contiguity provides the following I/O performance benefits:
  • Minimizes the disk-arm motion
  • Requires fewer I/O operations to read the smart large object
  • When doing large sequential reads, can take advantage of lightweight I/O, which reads in larger blocks of data (60 kilobytes or more, depending on your platform) in a single I/O operation
You can use the following command-line utilities to monitor the effectiveness of I/O operations on smart large objects:
  • oncheck -cS, -pe and -pS
  • onstat -g smb s option

The following sections describe how to use these utility options to monitor sbspaces.


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