December 1999
Intermediate to advanced
368 pages
10h 39m
English
Content preview from UNIX® Fault Management: A Guide for System AdministrationBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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: ...
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