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DP5900 2.7.2 is the only DP series model that supports immutability at both backup software (Avamar) and storage layer (Data Domain). Avamar must be on 19.4.0-124 with server hotfix 335584 and client hotfix 335595.
To enable immutability on the PowerProtect DP series appliance:
admin@avamar:~/>:avmaint config immutablebackups=true --ava --confirmthisisnotreversible
admin@avamar:~/>:avmaint nodelist | grep immutablebackups
Ensure that the command output is as follows:
immutablebackups="true”
To enable immutability on the PowerProtect DD layer:
(SYSADMIN USER) # elicense update
(SYSADMIN USER) # elicense show all
(SYSADMIN USER) # user add [username] role security
(SECURITY USER): # authorization policy set security-officer enabled >
(SYSADMIN USER) # system retention-lock compliance configure >
(SYSADMIN USER) # system retention-lock compliance enable >
(SYSADMIN USER) # mtree retention-lock enable mode compliance mtree [mtree]
admin@avamar:~/>:mccli checkpoint create –override_maintenance_scheduler=true
Note: NTP and time zone changes cannot be made through Avamar Client Manager after RLC is enabled.