Collecting Disk Performance Data
This section describes some common tools for measuring and monitoring disk performance. The following are some key terms that you need to know for this section:
Block I/O: The reads and writes that are held in the buffer cache (buffered) and then transferred in fixed-size blocks.
File I/O: The I/O access to a physical disk, which does not include virtual memory. It includes filesystem I/O, system I/O, raw I/O, and block I/O.
Logical I/O: The read or write system call made by an application to the filesystem. The call results in physical I/O if the data is not in the buffer cache.
Physical I/O: Data transferred from memory to disk, or vice versa. Physical I/O includes both file I/O and virtual memory I/O.
Raw I/O: ...
Get UNIX® Fault Management: A Guide for System Administration now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
