Displaying the values of the VxVM tunables


Displaying the values of the VxVM tunables
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The vxtune command allows you to display the values for tunable parameters in the following ways:

All of the VxVM tunable parameters
Tunable parameters by component
Single, specified parameter

To display all of the VxVM tunable parameters

To display all of the VxVM the tunable parameters, use the vxtune command with no argument.

# vxtune [-u {h|unit}] [-lr]

The -l option displays a description along with the values in default units.

The -r option displays the tunable values in raw bytes.

The -uh option displays output in human-friendly units.

The Reboot column displays N if the value can be changed online. The column displays Y if a system reboot is required before the new value takes effect.

The following example shows a truncated output, that shows the format.

# vxtune

Tunable              Current Value Default Value Reboot
-------------------- ------------- ------------- ------
vol_checkpt_default         20480         20480      Y
vol_cmpres_enabled              0             0      N
vol_cmpres_threads             10            10      N
vol_default_iodelay            50            50      Y
vol_fmr_logsz                   4             4      Y
vol_max_adminio_poolsz   67108864      67108864      Y
vol_max_nmpool_sz        67108864      67108864      N
.
.
.

To display the tunables for a VxVM component

The VxVM tunable parameters are classified into components.
To check the list of recognized components, use the following command:
```
# vxtune help components
```

To display the tunables for a VxVM component, specify the component name.

# vxtune component

For example, to display the supported tunables for VVR, use the following command:

# vxtune vvr

Tunable              Current Value Default Value Reboot
-------------------- ------------- ------------- ------
vol_cmpres_enabled               0             0      N
vol_cmpres_threads              10            10      N
vol_max_nmpool_sz         67108864      67108864      N
vol_max_rdback_sz        134217728     134217728      N
vol_max_wrspool_sz        67108864      67108864      N
vol_min_lowmem_sz           540672        540672      N
vol_nm_hb_timeout               10            10      N
vol_rvio_maxpool_sz      105224192     134217728      N

Additional options are -l to display a description, -r to display the output in bytes, and -uh to display the output in human-friendly units.

To display the value of a specific tunable

To display the value of the specific tunable, use the following vxtune command on the required host.
```
# vxtune tunable_name
```
For example, to view the value of the tunable vol_rvio_maxpool_sz, use the following command:
```
# vxtune vol_rvio_maxpool_sz
Tunable              Current Value Default Value Reboot
-------------------- ------------- ------------- ------
vol_rvio_maxpool_sz      105224192     134217728      N
```
Additional options are -l to display a description, -r to display the output in bytes, and -h to display the output in human-friendly units.

To display the output in bytes, use the vxtune command with the -r option.
```
# vxtune -r tunable_name
```
For example, to view the value of the tunable vol_max_wrspool_sz in bytes, use the following command:
```
# vxtune -r vol_max_wrspool_sz
Tunable              Current Value Default Value Reboot
-------------------- ------------- ------------- ------
vol_max_wrspool_sz        67108864      67108864      N
```