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allow.public.user.templates

If false, users will not be able to create public templates.

Per Account, overrides the global, e.g. for resellers not end customers

The implementation goes like adding value in the account_details table. Whenever public template is created we need to check in the account details table and then proceed.

storage.overprovisioning.factor

Used for storage overprovisioning calculation; available storage will be (actualStorageSize * storage.overprovisioning.factor)

per storage (per sysvol/datavol usage), overrides global

storage_pool_table will hold the key value pair of storage overprovisioning factor. During the check whether the storage pool has enough space for the volume we need to consider per storage level overprovisioning factor and while creating and updating the capacity entry in the for the storage.

remote.access.vpn.client.iprange

The range of ips to be allocated to remote access vpn clients. The first ip in the range is used by the VPN server

Per Account, overrides the global

account_details table will hold the key, value pair. In RemoteAccessVPNManager we need to take the value from the account_details table, validate it and then use.

storage.cleanup.interval

The interval (in seconds) to wait before running the storage cleanup thread.

Per AZ, eg for Private/Reseller AZ to offer differing storage service

Do we need to run different storage GC threads for different zones?
Or start single thread with the global value and within that check for each zone whether the interval is completed by storing the last cleanup time per zone and current time. If completed clenup the storage otherwise skip the zone ?

CPU/Memory/Storage Notification and Capacity Thresholds:

1) cluster.cpu.allocated.capacity.disablethreshold 
2) cluster.cpu.allocated.capacity.notificationthreshold
3) cluster.memory.allocated.capacity.disablethreshold
4)cluster.memory.allocated.capacity.notificationthreshold
5) pool.storage.allocated.capacity.disablethreshold
6) pool.storage.capacity.disablethreshold

Per cluster

CPU and Memory notification and capacity threshold values per cluster can be stored in the cluster_details table and these values can be used during capacity checking and raising alerts. Since as part of CPU and RAM overcommit feature cpu and ram are made at cluster level, so changing the notifications and capacity thresholds per cluster seems to be relevant.

VM Allocation Algorithm: vm.allocation.algorithm

If 'random', hosts within a pod will be randomly considered for VM/volume allocation. If 'firstfit', they will be considered on a first-fit basis.

Per Zone

data_center_details table holds the 'name, value' pairs of these parameters.
During the allocation for VM/volume this value corresponding to zone is to be considered.
Logic need to be changed for volume allocation too since it also allocation based on this paramter.

VR Network Throttling Rate:
network.throttling.rate

Default data transfer rate in megabits per second allowed in network

Per Zone

For the domRs Guest and Public networks we take network throttling from the corresponding Guest Virtual networkOffering. In case the value is not specified in the network offering it should consider the value from the global parameter network.throttling.rate. But right now there is a bug that noticed, guest and public networks are always considering network rate from the global parameter.
Apart from this, we need to store this value per each zone and in the router vm life cycle we need to consider the zone level parameter. This value can be stored in the datacenter details table

In case of user VMs for non default network the throttling rate is considered from the network offering, if this is not specified it considers the value from global value network.throttling.rate.
For default network it consider value from vm.network.throttling.rate.

Since both these parameters(network.throttling.rate, vm.network.throttling.rate) are considered in case of guest vm networks,
Is that fine to change only network.throttling.rate per zone?

Router Template ID: router.template.id

Default ID for template

Per Zone

In the current implementation, the details of the templates are stored in the vm_templates table. These include all systemVM templates for all hypervisors, During the router vm deployment it gets the list of templates based on the hypervisor type and takes the 1st template from the list. Otherwise we are not using this parameter to select the template.
So the task is to make this paramter work and provide the value per zone.
Design: In the datacenter_details table we maintain the router.template.id for each hypervisor. During the router vm deployment we consider the template id from this table based on the hypervisor type

Guest Domain Suffix : guest.domain.suffix

Default domain name for vms inside virtualized networks fronted by router

Per Zone

The value can be stored in the data_center_details_table and  during guest network and vpc creation we can consider the value per zone level from the data_center_details table.

External DNS Usage: use.external.dns

Bypass internal dns, use external dns1 and dns2

Per Zone

The value can be stored in the data_center_details table and during finalizing the virtual machine's profile this value can be taken per zone corresponding to the deploy destination of the vm.