Tunable Kernel Parameters
Table Of Contents
- Tunable Kernel Parameters
- Legal Notices
- Revision History
- Conventions
- 1 Overview
- 2 Accounting Subsystem
- 3 Asynchronous I/O Subsystem
- 4 File System Subsystem
- 5 Interprocess Communication (IPC) Subsystem
- 6 Kernel Crash Dump Subsystem
- 7 Memory Paging Subsystem
- 8 Process Management Subsystem
- 9 Spinlock Pool
- 10 Streams Subsystem
- 11 Miscellaneous Parameters
- Miscellaneous Parameter Summary
- CD-ROM Parameter Summary
- System Clock Parameter Summary
- Disk I/O Parameter Summary
- Intrusion Detection System/9000
- Fast Symbolic Link Traversal Parameter Summary
- Reserved System Memory Parameter Summary
- Network Parameter Summary
- Queued Signals Parameter Summary
- Real-Time Priority Parameter Summary
- Terminal Parameter Summary
- Maximum Users Parameter Summary
- Web Server Parameter Summary
- Miscellaneous Parameter Summary
- A Table of Tunable Kernel Parameters
File System Subsystem
File System Parameter Summary
Chapter 4
25
Logical Volume Manager (LVM) Parameter Summary
Control kernel interaction with the Logical Volume Manager. For more information, see
“Logical Volume Manager (LVM) Operation” on page 30.
Open or Locked Files Parameter Summary
Set number of files that can be open or locked simultaneously. For more information, see
“Open or Locked Files Parameters” on page 29.
Disk Read-Ahead Parameter Summary
Control the amount of memory available for disk read-ahead operations.
File System:
LVM
maxvgs Maximum number of volume groups configured by the
Logical Volume Manager on the system. Manpage: maxvgs
(5).
File System:
Open/Lock
maxfiles Soft limit on how many files a single process can have
opened or locked at any given time. Manpage: maxfiles (5).
File System:
Open/Lock
maxfiles_lim Hard limit on how many files a single process can have
opened or locked at any given time. Manpage:
maxfiles_lim (5).
File System:
Open/Lock
ncsize Inode space needed for directory name lookup cache
(DNLC). NO MANPAGE.
File System:
Open/Lock
nfile Maximum number of files that can be opensimultaneously
on the system at any given time. Manpage: nfile (5).
File System:
Open/Lock
nflocks Maximum combined number of file locks that are available
system-wide to all processes at one time. Manpage: nflocks
(5).
File System:
Open/Lock
ninode Maximum number of open inodes that can be in memory.
Manpage: ninode (5).
File System:
Read
hfs_max_ra_blocks The maximum number of read-ahead blocks that the
kernel may have outstanding for a single HFS file system.
Manpage: hfs_max_ra_blocks (5).
File System:
Read
hfs_max_revra_blocks The maximum number of reverse read-ahead blocks that
the kernel may have outstanding for a single HFS file
system. Manpage: hfs_max_revra_blocks (5).
File System:
Read
hfs_ra_per_disk The amount of HFS file system read-ahead per disk drive,
in KB. Manpage: hfs_ra_per_disk (5).
File System:
Read
hfs_revra_per_disk The amount of memory (in KB) for HFS reverse
read-ahead operations, per disk drive. Manpage:
hfs_revra_per_disk (5).
File System:
Read
hp_hfs_mtra_enabled Enable or disable HFS multithreaded read-ahead. NO
MANPAGE.