Editing Windows kstat


== 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:

 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)

Setting '''hostid''' (before you import/create any pools)

  kstat.exe -w zfs:0:tunable:hw_hostid=11223344
@@ Line 11: / Line 11: @@
 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:
@@ Line 34: / Line 20: @@
 (In the future, there will be something to handle this automatically)
-=== HostID ===
+Setting '''hostid''' (before you import/create any pools)
-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.