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man pages section 8: System Administration Commands

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Updated: Wednesday, July 27, 2022

vfs_cacheprime (8)


vfs_cacheprime - prime the kernel file data cache


vfs objects = cacheprime


System Administration tools                                  VFS_CACHEPRIME(8)

       vfs_cacheprime - prime the kernel file data cache

       vfs objects = cacheprime

       This VFS module is part of the samba(7) suite.

       The vfs_cacheprime VFS module reads chunks of file data near the range
       requested by clients in order to make sure the data is present in the
       kernel file data cache at the time when it is actually requested by

       The size of the disk read operations performed by vfs_cacheprime is
       determined by the cacheprime:rsize option. All disk read operations are
       aligned on boundaries that are a multiple of this size. Each range of
       the file data is primed at most once during the time the client has the
       file open.

       This module is stackable.

       cacheprime:rsize = BYTES
           The number of bytes with which to prime the kernel data cache.

           The following suffixes may be applied to BYTES:

                  o   K - BYTES is a number of kilobytes

                  o   M - BYTES is a number of megabytes

                  o   G - BYTES is a number of gigabytes

       For a hypothetical disk array, it is necessary to ensure that all read
       operations are of size 1 megabyte (1048576 bytes), and aligned on 1
       megabyte boundaries:

                vfs objects = cacheprime
                cacheprime:rsize = 1M

       cacheprime is not a substitute for a general-purpose readahead
       mechanism. It is intended for use only in very specific environments
       where disk operations must be aligned and sized to known values (as
       much as that is possible).

       This man page is part of version 4.13.17 of the Samba suite.

       The original Samba software and related utilities were created by
       Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

       See attributes(7) for descriptions of the following attributes:

       |Availability   | service/network/samba |
       |Stability      | Volatile              |

       Source code for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-

       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from

       Further information about this software can be found on the open source
       community website at http://www.samba.org/.

Samba 4.13.17                     06/28/2022                 VFS_CACHEPRIME(8)