Changes:
To make sure migration does not attempt to pick a host that has running VMs more than the max guest VM's limit:
- Changed manual migration to call host allocators to return a list of hosts suitable for migration. Host allocators check for the max guest VM limit.
- Earlier we returned hosts with enough capacity but now Host Allocators make other checks along with capacity. So the list of hosts returned are hosts that have enough capacity AND satisfy all other conditions like host tags, max guests limit etc. Or in other words Allocators dont return the hosts that dont satisfy all conditions even if they have capacity.
-Therefore, now we mark the list of hosts returned for manual migration as 'suitable' hosts instead of 'hasenoughCapacity' in the HostResponse.
- HA migration already calls allocators, so no change is needed there.
Changes:
- Changed host allocators/planner to use cpu.overprovisioning.factor
- Removed following: while adding a new host, we were setting the total_cpu in op_host_capacity to be actual_cpu * cpu.overprovisioning.factor. Now we set it to actual_cpu.
- ListCapacities response now calculates the total CPU as actual * cpu.overprovisioning.factor (This change does not add anything new - listCapacities was pulling total CPU from op_host_capacity DB earlier which had the cpu.overprovisioning.factor applied already. Now we need to apply it over the DB entry.)
- HostResponse has a new field: 'cpuWithOverprovisioning' that returns the cpu after applying the cpu.overprovisioning.factor
- Db Upgrade 222 to 224 now updates the total_cpu in op_host_capacity to be the actual_cpu for each Routing host.
This is a Root admin only functionality
---------------------
Service API changes:
---------------------
- ManagementServer will expose new API:
Pair<List<HostVO>, List<Long>> listHostsForMigrationOfVM(UserVm vm, Long
startIndex, Long pageSize)
The API returns list of all hosts in the VM's cluster minus the current host and also a list of hostIds that seem to have enough CPU and RAM capacity to host this VM.
- ListHostsCmd will call this service API if virtualmachineid is present in the request.
- MigrateVmCmd is the new command added that takes in virtualmachineid and destination hostid
- UserVmService will expose a new API: UserVm migrateVirtualMachine(UserVm vm, Host destinationHost)
------------------------------------
API throws error in following cases:
------------------------------------
- User is not a root Admin. (‘Permission denied’)
- A VM uses local storage, we cannot migrate it, so ‘listHosts’ will throw error.
- We fail to migrate the VM on the chosen host.
- API will support migration for XenServer only currently. So error is thrown
if hypervisor is not XenServer (e.g KVM, vSphere etc)
- Destination host is not in same cluster as source host.
- VM is not in running state
Bug 7723 - merge or re-write host tagging into master / 2.2
Bug 7627 - Need more logging for Allocators
Bug 8317 - Add better resource allocation failure messages
Changes for Deployment Planner to use host and storagePool allocators to find deployment destination.
Also has the changes for host tag feature.
Improved the logging for allocators.
Nitin Mehta
prachi
Nitin
Frank
Edison Su
Alex Huang