Prior to vCenter Server 7.0 Update 1, FDM configuration was present at location /etc/opt/vmwware/fdm/fdm.cfg. You can modify these configurable values of FDM for various purposes. 

As ConfigStore is available in ESXi host starting with vCenter Server 7.0, the FDM configuration present in file: /etc/opt/vmwware/fdm/fdm.cfg under section <FDM>...</FDM> are migrated to ConfigStore. Hence, FDM process uses the values present in the ConfigStore. However, the rest of the other contents of this file is still being used by FDM process.

VMware vCenter Server 7.0.x

Property Name in fdm.cfg (until vCenter Server 7.0)	New Property Name	Name in ConfigStore
fdm.memReservationMB	No Change	mem_reservation_MB
fdm.memoryCheckerTimeInSecs	No Change	memory_checker_time_in_secs
fdm.nodeGoodness	No Change	node_goodness
fdm.stateLogInterval	No Change	state_log_interval
fdm.reportFailoverFailEvent	No Change	report_failover_fail_event
fdm.deadIcmpPingInterval	No Change	dead_icmp_ping_interval
fdm.hostTimeout	No Change	host_timeout
fdm.isolationPolicyDelaySec	No Change	isolation_policy_delay_sec
fdm.icmpPingTimeout	No Change	icmp_ping_timeout
fdm.storageVmotionCleanupTimeout	No Change	storage_vmotion_cleanup_timeout
fdm.ft.cleanupTimeout	fdm.ftCleanupTimeout	ft_cleanup_timeout
fdm.event.maxMasterEvents	fdm.maxMasterEvents	max_master_events
fdm.event.maxSlaveEvents	fdm.maxSlaveEvents	max_slave_events
fdm.policy.unknownStateMonitorPeriod	fdm.unknownStateMonitorPeriod	unknown_state_monitor_period

Notes:

• It is expected to set/update the configuration of FDM by running the configstorecli command on the ESXi host.
• The fdm.cfg file should still be editable. However, only the properties mentioned in this section (For example <FDM>...</FDM> are migrated to Configstore.

Sample commands to add/update the FDM configuration on the ESXi host:

To Read: FDM configuration

$configstorecli config current get -g cluster -c ha -k fdm
{
   "mem_reservation_MB": 200,
   "memory_checker_time_in_secs": 30
}

To Update: FDM configuration

$cat /tmp/test.json
{
   "mem_reservation_MB": 250,
   "memory_checker_time_in_secs": 60
}
$configstorecli config current set -g cluster -c ha -k fdm -infile /tmp/test.json

To add: FDM configuration

$cat /tmp/test.json
{
   "mem_reservation_MB": 250,
   "memory_checker_time_in_secs": 60,
   "icmp_ping_timeout": 30
}
$configstorecli config current set -g cluster -c ha -k fdm -infile /tmp/test.json
$configstorecli config current get  -g cluster -c ha -k fdm
{
   "icmp_ping_timeout": 30,
   "mem_reservation_MB": 250,
   "memory_checker_time_in_secs": 60
}