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Oracle Linux: How to Adjust max_hw_sectors_kb/max_sectors_kb in OVM Environments (Doc ID 2804866.1)

Last updated on SEPTEMBER 09, 2021

Applies to:

Linux OS - Version Oracle Linux 7.0 and later


This document describes how to adjust max_hw_sectors_kb/max_sectors_kb in OVM environments.

max_sectors_kb determines the IO size at the block layer of the DomU/GuestVM, and is confined within a range between the page size (i.e. commonly at 4KiB) and max_hw_sectors_kb, whose value comes from the device driver. Divide these *_sectors_kb values by hw_sector_size translates to the number of sectors in each IO size.

Documentation/block/queue-sysfs.txt gives these definitions:


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