Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

This command restores vx_ninode to its default value by clearing the user-specified
value. The default value is the value determined by VxFS to be optimal based on
the amount of system memory, which is used if vx_ninode is not explicitly set.
Delaying a change to vx_ninode until after a reboot
# kctune -h -s vx_ninode=10000
If the -h option is specified, the specified value for vx_ninode does not take effect
until after a system reboot.
Tuning performance optimization of inode allocation
The delicache_enable tunable parameter specifies whether performance
optimization of inode allocation and inode reuse during a new file creation is
turned on or off. The delicache_enable tunable is not supported for cluster file
systems. You can specify the following values fordelicache_enable:
■ 0 – Disables delicache optimization.
■ 1 – Enables delicache optimization.
The default value of delicache_enable is 1 for local mounts and 0 for cluster file
systems.
VxFS buffer cache high water mark
VxFS maintains its own buffer cache in the kernel for frequently accessed file
system metadata. This cache is different from the HP-UX kernel buffer cache that
caches file data. The vx_bc_bufhwm dynamic, global, tunable parameter lets you
change the VxFS buffer cache high water mark, that is, the maximum amount of
memory that can be used to cache VxFS metadata.
The initial value of vx_bc_bufhwm is zero. When the operating system reboots,
VxFS sets the value of vx_bc_bufhwm based on the amount of system memory.
You can explicitly reset the value of vx_bc_bufhwm by changing the value of
vxfs_bc_bufhwm using the sam or kctune commands.
See the sam(1M) and kctune(1M) manual pages.
You can also set the value by adding an entry to the system configuration file. For
example, the following entry:
vxfs_bc_bufhwm vx_bc_bufhwm 300000
47VxFS performance: creating, mounting, and tuning file systems
Tuning the VxFS file system