10-16-2018
Quote:
Originally Posted by
javanoob
But how do I know if the amount of memory available and allocated to ZFS ARC is sufficient or not ?
Check the cache hit ratio to see how efficient it is. The closer to 100%, the better.
If you can fit all the files you use in RAM (hit rate 100%) and still have room enough for the applications and other consumers RAM usage, go for it and set the ZFS ARC size to be able to host everything.
On the opposite and more likely situation, that's a trade off and you should measure usage, do tests that last a few days or more, see how your RAM is used, see how performance is impacted by giving more memory to the cache or more memory to the applications, and act accordingly.
Last edited by jlliagre; 10-17-2018 at 04:18 AM..
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LEARN ABOUT HPUX
vxfs_bc_bufhwm
vxfs_bc_bufhwm(5) File Formats Manual vxfs_bc_bufhwm(5)
NAME
vxfs_bc_bufhwm - VxFS buffer cache high water mark(determines the VxFS buffer cache size)
SYNOPSIS
VALUE
Specify an integer value.
Minimum
6144 KB
Maximum
None
Default
0
DESCRIPTION
VxFS maintains a buffer cache in the kernel for frequently accessed file system metadata in addition to the HP-UX kernel buffer cache that
caches the file data. tunable parameter determines the size of the VxFS buffer cache (the maximum amount of memory that can be used to
cache VxFS metadata).
The default value computed based on the amount of system memory ensures good system performance across a wide range of applications.
The value of is specified in kilobytes. To improve performance during application loads that cause frequent file system metadata changes on
the system (for example, a high rate of file creation or deletion, or accessing large directories), change the value of
Notes
Use the command to monitor buffer cache statistics and inode cache usage.
EXAMPLES
Set the maximum of size of buffer cache at 300000:
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), vxfsstat(1M), vx_maxlink(5), vx_ninode(5), vxfs_ifree_timelag(5).
Tunable Kernel Parameters vxfs_bc_bufhwm(5)