ReadAhead is a technique which should improve disk performance. When small part of the file is read, Linux reads much more data and stores it in internal cache.

To print readahead for disk /dev/hda, use

blockdev --getra /dev/hda

It is printed in 512-bytes blocks

To modify ReadAhead, use

blockdev --setra 1024 /dev/hda

LinuxMM: ReadAhead (last edited 2017-12-30 01:05:11 by localhost)