Log store for how long? Depending on disk capacity? How big capacity we need to prepare for 1 month log been store.
It depends on how much logging you are doing from your firewall.
The more you log, the more storage that you need.
I recommend reading this one -> https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/dimension/install_dimension_d.html
Adrian from Australia
Log storage varies wildly depending on how much traffic your firewall sees and how much diagnostic data you're logging. The link @xxup posted is a good starting point.
Whatever you end up going with, I'd suggest provisioning at least 20% more for wiggle room.
WatchGuard Customer Support
"...Log store for how long? Depending on disk capacity? ...."
By default yes. Disk size - 20% = log/report data storage. Dimension
will fill this space up to 95% then will start to FiFo data.
You can control data retention by days from Server Management / General / Database size.