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Enabling and disabling the caching of readahead data

Sequentially read blocks (readahead data) are typically evicted from the buffer cache quickly to make space for randomly read blocks. You can add sequentially read data to the WAFL external cache to improve read response times for sequential data that clients read repetitively.

About this task

This command is available through the nodeshell. You access the nodeshell by using the system node run command. For more information, see the man page.


  1. Enter the following command to enable or disable the caching of readahead data: options flexscale.readahead_blocks {on|off}