NAME    [Toc]    [Back]

       sys_attrs_presto - presto subsystem attributes

DESCRIPTION    [Toc]    [Back]

       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.

              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.

              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 metadata 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  filesystem
  metadata but do not reread recently written
              data.

SEE ALSO    [Toc]    [Back]

       sys_attrs(5)

       Guide to Prestoserve

       System Configuration and Tuning



                                              sys_attrs_presto(5)