vx_ninode(5) File Formats Manual vx_ninode(5)
NAME
vx_ninode - determine the internal node table size
SYNOPSIS
size]
VALUE
You must set these tunables to a constant value.
Minimum
This tunable can be set to (which means default), or to a value equal or greater than
Default
Based on the available physical memory, by default (when is the internal inode cache size is set according to the following table. In this
table the first column is the amount of physical memory in megabytes installed on the system at boot time and the second column is the max-
imum number of inodes to be cached.
Physical Memory (MB) Maximum Inodes
8 400
16 750
32 1500
64 2500
128 5000
256 16000
512 32000
1024 64000
2048 128000
8192 256000
32768 512000
131072 1024000
VxFS interpolates the value of for the memory that falls between two points and extrapolates from the largest entry if the memory is larger
than the largest entry in the table above.
Recommended values
Systems with low memory size (up to 3 GB per CPU) may not require a large inode cache when file system performance is not critical. HP
recommends setting a minimum value for based upon the memory configuration as specified in the following table. In this table the first
column represents the available physical memory in gigabytes and the second column is the value of
Physical Memory (GB) vx_ninode
1 16384
2 32768
3 65536
>3 131072
DESCRIPTION
The VxFS file system caches the inodes in an inode table. The kernel tunable determines the number of inodes in the inode table to help
VxFS in caching. is a dynamic tunable.
Who Is Expected to Change This Tunable?
Any privileged user can change this value. Note that the default state should be appropriate for most environments.
Restrictions on Changing
None. The tunable is dynamic; tuning will take effect immediately on the running system.
When Should the Value of This Tunable Be Raised?
This tunable value should be raised when applications (for example, file servers and web servers) expect the file systems to perform bet-
ter.
What Are the Side Effects of Raising the Value?
Increasing the value of this tunable may consume more memory.
When Should the Value of This Tunable Be Lowered?
HP recommends changing the value of this tunable according to the table above when the system is under memory pressure.
What Are the Side Effects of Lowering the Value?
The applications will see performance degradation.
What Other Tunable Values Should Be Changed at the Same Time?
None.
EXAMPLES
Change the value of to
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or its meaning may change in the future releases
of HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
SEE ALSO
kctune(1M), vx_maxlink(5), vxfs_bc_bufhwm(5), vxfs_ifree_timelag(5).
Tunable Kernel Parameters vx_ninode(5)