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sys_attrs_presto(5)					  sys_attrs_presto(5)



NAME

  sys_attrs_presto - presto subsystem attributes

DESCRIPTION

  This reference page lists and	describes attributes for the Prestoserve
  (presto) kernel subsystem. Refer to the sys_attrs(5) reference page for an
  introduction to the topic of kernel subsystem	attributes.

  The Prestoserve product consists of optional hardware	(NVRAM)	and software
  that must be installed on your system.  See the Guide	to Prestoserve for
  details on Prestoserve. See the System Configuration and Tuning manual for
  information about Prestoserve	within the context of managing file system
  performance.



  presto_buffer_hash_size
      Size, in bytes, of the Prestoserve buffer	hash table.

      Default value: 256 (bytes)

      Minimum value: 0

      Maximum value: 65,536 (64	KB)

      Increasing the value of the presto_buffer_hash_size attribute may
      improve throughput by decreasing Prestoserve lock	contention.



  prmetaonly
      A	value that controls whether Prestoserve	will cache only	UFS and	AdvFS
      file-system metadata or both file-system metadata	and synchronous-write
      data. If the attribute is	set to 1, Prestoserve caches only file-system
      metadata.	If the attribute is set	to 0 (zero), both file-system meta-
      data and synchronous-write data are cached.

      Default value: 0

      Setting prmetaonly to 1 may improve the performance of applications
      that access many small files, or applications that access	a large
      amount of	file-system metadata but do not	reread recently	written	data.

SEE ALSO

  sys_attrs(5)

  Guide	to Prestoserve

  System Configuration and Tuning