Solaris Dynamic Tracing Guide
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Chapter 27

io Provider

The io provider makes available probes related to disk input and output. The io provider enables quick exploration of behavior observed through I/O monitoring tools such as iostat(1M). For example, using the io provider, you can understand I/O by device, by I/O type, by I/O size, by process, by application name, by file name, or by file offset.

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