Tunable Kernel Parameters

File System Subsystem
File System Parameter Summary
Chapter 4
24
File System Parameter Summary
Configurable parameters related to file system performance fall into the following
categories.
See also “How to Specify Configurable Parameter Values” on page 13.
File System Buffer Parameter Summary
Allocate system physical memory resources for static and dynamic file system buffer
cache space. For more information, see “File System Buffer Parameters” on page 27.
Journaled File Systems (VxFS) Parameter Summary
Allocate space for the Directory Name Lookup Cache (DNLC) associated with VxFS file
system inodes.
File System:
Buffer
bufpages Number of 4 KB pages in file system static buffer cache.
Manpage: bufpages (5).
File System:
Buffer
dbc_max_pct Maximum percentage of memory for dynamic buffer cache.
Manpage: dbc_max_pct (5).
File System:
Buffer
dbc_min_pct Minimum percentage of memory for dynamic buffer cache.
Manpage: dbc_min_pct (5).
File System:
Buffer
disksort_seconds Maximum wait time for disk requests. NO MANPAGE.
File System:
Buffer
nbuf System-wide number of static file system buffer and cache
buffer headers. Manpage: nbuf (5).
File System:
Journaled
vxfs_max_ra_kbytes Maximum amount of read-ahead data, in KB, that the
kernel may have outstanding for a single VxFS file
system. Manpage: vxfs_max_ra_kbytes (5).
File System:
Journaled
vxfs_ra_per_disk Maximum amount of VxFS file system read-ahead per
disk, in KB. Manpage: vxfs_ra_per_disk (5).
File System:
Journaled
vx_fancyra_enable Enable or disable VxFS file system read-ahead. NO
MANPAGE.
File System:
Journaled
vx_maxlink Number of subdirectories created within a directory. NO
MANPAGE.
File System:
Journaled
vx_ncsize Memory space reserved for VxFS directory path name
cache. Manpage: vx_ncsize (5).
File System:
Journaled
vx_ninode Number of entries in the VxFS inode table. NO
MANPAGE.