Originally from the User Slack
@Vinoth_RajendranVinoth_Rajendran**:** Hi Team,
If we do not specify explicitly, how much percentage of RAM does Scylla DB service consume?
@Felipe_Cardeneti_Mendes**:** > By default, the machine’s entire memory except a certain reservation left for the OS (defaulting to the maximum of 1.5G or 7% of total memory) is pre-allocated for the application in this manner. This default can be changed by either changing the amount reserved for the OS (not used by Seastar) with the --reserve-memory option, or by explicitly giving the amount of memory given to the Seastar application, with the -m option.