NAME

       fs_precache - Set precache size

SYNOPSIS

       fs precache -blocks <size in 1K blocks>
           [-help]

       fs p -b <size in 1K blocks>
           [-h]

DESCRIPTION

       The fs precache 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.

OPTIONS

       -blocks <size in 1K blocks>
           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.

OUTPUT

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

          New precache size set.

EXAMPLES

       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.

PRIVILEGE REQUIRED

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

SEE ALSO

       afsd(8)

COPYRIGHT

       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.