The existing on both source and target to increase the number of CPUS and memory of the VA.
1. Are you currently running to make sure there are no backup or replication.
2. Open the vsphere client.
3. Select the target of the VA-left-click on the power -> Power Off. Verify that the VA is powered down.
Left-click to select the target of the VA 4. In the Settings and select Edit.
5. Increase the memory to 8 GB.
6. Increase the CPU to 4.
7. Press OK.
8. Power on the VA.
After the system boots to the manually or schedule from the VA replication process.