Document link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/deduplicating_and_compressing_logical_volumes_on_rhel/index#increasing-block-cache-size_optimizing-vdo-performance

Section number and name: 5.4. Increasing block map cache size

Describe the issue: The process indicated in this section is incorrect.  It mentions changing the value in the LVM configuration files but then uses the `vdo` utility which does not exist in RHEL-9.

Suggestions for improvement:

As mentioned in RHEL-30097.

The correct steps would be:

1. deactivate the VDOLV
lvchange -an vg/vdolv 

2. Change the vdo setting:
lvchange --vdosettings "block_map_cache_size_mb=1280" vg/vdolv 

3. Activate the VDO lv again
lvchange -ay vg/vdolv

Additional information: