fs_precache - Set precache size

       Copyright 2013 Sine Nomine Associates

       This documentation is covered by the BSD License as written in the doc/LICENSE file. This  man  page  was
       written by Andrew Deason for OpenAFS.

OpenAFS                                            2025-03-21                                     FS_PRECACHE(1)

       The fsprecache command configures to what degree the Cache Manager will attempt to prefetch cache blocks
       when an application opens a file for reading.  If this behavior is enabled, whenever a file is opened for
       reading, the Cache Manager will immediately initiate an asynchronous fetch request for that file.  This
       fetch request will fetch the configured amount of data for that file, and store the data in the cache. In
       some scenarios, this can improve performance.

       Note that this prefetching behavior is done by the Cache Manager itself. The underlying Operating System
       may also perform its own prefetching behavior, depending on various settings or application hints.

       This command was introduced in OpenAFS 1.5.37.

       The following command configures the Cache Manager to prefetch the first 100 kilobytes of any file that's
       opened for reading:

          % fs precache -blocks 100
          New precache size set.

       fs_precache - Set precache size

-blocks <sizein1Kblocks>
           Specifies  how  much  data  to  prefetch  for each applicable file, in 1024-byte blocks. Specify 0 to
           disable prefetching behavior. By default, prefetching is disabled.

       -help
           Prints the online help for this command. All other valid options are ignored.

       If the specified precache size has been set successfully, the following message will be printed:

          New precache size set.

       The issuer must be logged in as the local superuser "root".

afsd(8)

fsprecache-blocks <sizein1Kblocks>
           [-help]

       fsp-b <sizein1Kblocks>
           [-h]