Yes, If the DHCP-server is running then it needs to be disabled before making any changes in DHCP. To check the DHCP server status:->
HP-Stack-2920# sh dhcp-server
Configuration and Status - DHCP Server
DHCP Server Enabled : No
DHCPv4 Operational Status : Disabled
Traps Enabled : Yes
Persistent Lease Database : No
Conflict Logging Enabled : No
DHCP VLAN Interfaces :
HP-Stack-2920#