dbc_max_pct.5 (2010 09)

d
dbc_max_pct(5) dbc_max_pct(5)
OBSOLETED OBSOLETED
(Kernel Tunable Parameter)
NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter
DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they
have no effect on the kernel.
Use the file cache tunables filecache_max
and filecache_min
(see filecache_max (5)).
In previous releases, the tunables
dbc_min_pct and dbc_max_pct
were used to set limits to the
dynamic buffer cache, and the tunables bufcache_max_pct,
bufpages, and nbuf were used for tun-
ing the buffer cache when a static cache was desired.
This release of HP-UX offers improved file caching technology and improved physical memory control
associated to caching file I/O data. The number of tunable parameters used to control file caching
memory usage is reduced from five to two, and previous usability issues are addressed.
Restrictions on Changing
These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables,
bufcache_max_pct
, bufpages, dbc_min_pct, dbc_max_pct,ornbuf
results in an error.
Use the tunables
filecache_max
and filecache_min
to set limits on the file cache. Note that, on a
any given system, the optimum values of these two new tunables are not necessarily equivalent to the
optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter-
mine if the new default values yield acceptable performance on your system, before attempting to change
the values of the new file cache tunables.
AUTHOR
bufcache_max_pct,
bufpages, dbc_min_pct, dbc_max_pct, and nbuf were developed by HP.
SEE ALSO
filecache_max(5).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1