Windows kstat

2024-05-05T16:50:06Z

185.195.59.161: of typo, changed to or

== Windows kstat ==

'''kstat''' is the utility used on illumos to query the kernel for various statistics and detailed information.
It performs more or less the same responsibly as ''/proc/'' on Linux.

Simply run the command to dump everything:

kstat.exe
(output is large)

You can also use it to set certain tunables in the kernel, for example:

<hr>

** kstat.exe ** is no longer the recommended way to change tunables. All tunables
are now written to the Registry, and are updated dynamically when changed.

The following information is no longer relevant!

<hr>

=== Arc Max ===

'''It is now recommended that you use the [[Windows_Registry|Registry]] to set the ZFS tunables.'''

To set max ARC size to 512 MiB:
kstat.exe -w zfs:0:tunable:zfs_arc_max=536870912

Dump the "zfs:0:tunable" sub-section to list the available knobs to fiddle with.

A setting is not retained over reboot, and will need to be set each boot.
(In the future, there will be something to handle this automatically)

=== HostID ===

The '''HostID''' on Windows is generated from the Software/Microsoft/Cryptography/MachineGuid and
generally most users do not need to change it. However, should you want to set the '''HostID''' that
ZFS uses, you can do so by running;

kstat.exe -w zfs:0:tunable:hw_hostid=11223344

=== ZFSin debug ===

You can also ask the kernel to save the debug print buffer to disk.

kstat.exe -w zfs:0:tunable:vnop_debug=1337

Will write the buffer to '''C:/Windows/debug/ZFSin.txt''' - if the directory exists.

See [[Windows_BSOD#Debug_Print_Buffer|Debug]] for more information on the debug buffer.

OpenZFS on OS X - User contributions [en]

Windows kstat