VMware VMWARE CLOUD DIRECTOR 1.0 - TECHNICAL NOTE Guía de usuario Pagina 65
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The placement engine uses the following criteria to select candidate resource pools for a virtual machine.
n
CPU capacity
n
Memory capacity
n
Number of virtual CPUs
n
Hardware version supported by the host
The placement engine filters out disabled resource pools from the candidate list so that no virtual machine is
created on a disabled resource pool. When possible, the placement engine places virtual machines on the same
hub as other virtual machines in the organization vDC.
The placement engine uses the following criteria to select candidate datastores for a vApp and its virtual
machines.
n
Storage capacity
n
Storage profile
The placement engine filters out disabled datastores from the candidate list so that no virtual machine is created
on a disabled datastore.
The placement engine uses the network name to select candidate network pools for a vApp and its virtual
machines.
After the placement engine selects a set of candidate resources, it ranks the resources and picks the best location
for each virtual machine based on the CPU, virtual RAM, and storage configuration of each virtual machine.
While ranking resources, the placement engine examines the current and estimated future resource use.
Estimated future use is calculated based on powered-off virtual machines currently placed on a given resource
pool and their expected use after they are powered on. For CPU and memory, the placement engine looks at
the current unreserved capacity, the maximum use, and the estimated future unreserved capacity. For storage,
it looks at the aggregated provisioned capacity provided by the cluster that each resource pool belongs to. The
placement engine then considers the weighted metrics of the current and future suitability of each resource
pool.
The placement engine favors resource pools that provide the minimum of unreserved capacity for CPU and
memory and free capacity for storage. It also gives lower preference to yellow clusters so that yellow clusters
are only selected if no healthy cluster is available that satisfies the placement criteria.
When a virtual machine is powered on, either as part of starting a vApp or on its own, the placement engine
runs to validate that the resource pool the virtual machine is assigned to has sufficient resources to support
the requirements of the virtual machine. This step is necessary because the resource availability on the resource
pool might have changed since the virtual machine was created on the resource pool. If the resource pool lacks
sufficient capacity to power on the virtual machine, the placement engine finds another compatible resource
pool on the provider vDC that satisfies the requirements of the virtual machine and places the virtual machine
there. This substitution might result in the migration of the virtual machine's VMDKs to a different datastore
if no suitable resource pools are connected to the datastore the VMDKs are located on.
During concurrent deployment situations when a resource pool is close to capacity, the validation of that
resource pool might succeed even though the resource pool lacks the resources to support the virtual machine.
In these cases, the virtual machine cannot power on. If a virtual machine fails to power on in this situation,
start the power on operation again to prompt the placement engine to migrate the virtual machine to a different
resource pool.
When the cluster that a resource pool belongs to is close to capacity, a virtual machine on that resource pool
might still be able to power on even when no individual host has the capacity to power on the virtual machine.
This happens as a result of capacity fragmentation at the cluster level. In such cases, a system administrator
should migrate a few virtual machines out of the cluster so that the cluster maintains sufficient capacity.
Chapter 8 Working with vApps
VMware, Inc. 65
- EN-000818-00 1
- 2 VMware, Inc 2
- Contents 3
- 4 VMware, Inc 4
- Index 123 5
- 6 VMware, Inc 6
- Intended Audience 7
- 8 VMware, Inc 8
- Organizations 9
- Users and Groups 9
- Log In to the Web Console 10
- Using vCloud Director 10
- Set Mozilla Firefox Options 11
- 12 VMware, Inc 12
- Set User Preferences 13
- Change Your Password 14
- Managing Users and Groups 2 15
- Add a Local User 16
- Import an LDAP User 16
- Edit a User 17
- Delete a User 17
- Send User Notifications 17
- 18 VMware, Inc 18
- Working with Groups 19
- Modify the Role of a Group 20
- Managing Cloud Resources 3 21
- 22 VMware, Inc 22
- VMware, Inc. 23 23
- Option Description 24
- VMware, Inc. 25 25
- 26 VMware, Inc 26
- VMware, Inc. 27 27
- 28 VMware, Inc 28
- VMware, Inc. 29 29
- Networks 30
- VMware, Inc. 31 31
- 32 VMware, Inc 32
- VMware, Inc. 33 33
- Managing Expired Items 34
- Working in an Organization 4 35
- Set Up an Organization 36
- Import Users and Groups 37
- Configure Email Preferences 37
- 38 VMware, Inc 38
- Modify Your Email Settings 39
- 40 VMware, Inc 40
- VMware, Inc. 41 41
- View Organization Events 42
- View Organization Tasks 43
- 44 VMware, Inc 44
- Working with Catalogs 5 45
- Access a Catalog 46
- Publish a Catalog 46
- Share A Catalog 47
- Change the Owner of a Catalog 47
- Delete a Catalog 48
- Working in Published Catalogs 49
- 50 VMware, Inc 50
- Working with Media Files 6 51
- Copy Media Files to a Catalog 52
- Delete Media Files 53
- Modify Media File Properties 53
- 54 VMware, Inc 54
- Working with vApp Templates 7 55
- Download a vApp Template 56
- VMware, Inc. 57 57
- 58 VMware, Inc 58
- Delete a vApp Template 59
- 60 VMware, Inc 60
- Working with vApps 8 61
- Create a New vApp 62
- Complete the vApp Profile 63
- Configure Networks 64
- Chapter 8 Working with vApps 65
- VMware, Inc. 65 65
- Start a vApp 66
- Copy a vApp 66
- Stop a vApp 67
- Suspend a vApp 67
- View vApp Virtual Machines 68
- VMware, Inc. 69 69
- 70 VMware, Inc 70
- View vApp Networks 71
- Adding Networks to a vApp 71
- Add a vApp Network to a vApp 72
- Routed X X X X 73
- Isolated X 73
- VMware, Inc. 75 75
- 76 VMware, Inc 76
- VMware, Inc. 77 77
- 78 VMware, Inc 78
- VMware, Inc. 79 79
- Reset Your vApp Network 80
- Delete a vApp Network 80
- Modify Network Properties 80
- VMware, Inc. 81 81
- Editing vApp Properties 82
- Reset vApp Leases 83
- Share a vApp 83
- Display a vApp Diagram 84
- Change the Owner of a vApp 84
- VMware, Inc. 85 85
- Create a Snapshot of a vApp 86
- Revert a vApp to a Snapshot 86
- Remove a Snapshot of a vApp 86
- Copy a vApp to Another vDC 86
- Move a vApp to Another vDC 87
- Delete a vApp 87
- 88 VMware, Inc 88
- VMware, Inc 89
- Power On a Virtual Machine 90
- Power Off a Virtual Machine 90
- Suspend a Virtual Machine 91
- Insert a CD/DVD 92
- Eject a CD/DVD 92
- Insert a Floppy 92
- Eject a Floppy 93
- 94 VMware, Inc 94
- Delete a Virtual Machine 95
- 96 VMware, Inc 96
- Resource Allocation Shares 97
- Resource Allocation Limit 98
- VMware, Inc. 99 99
- 100 VMware, Inc 100
- Installing VMware Tools 101
- 102 VMware, Inc 102
- Disable Guest Customization 103
- Start the vApp 103
- Install VMware Tools 103
- Stop the vApp 104
- Enable Guest Customization 104
- Add vApp to Catalog 106
- Upgrade VMware Tools 108
- 110 VMware, Inc 110
- VMware, Inc. 111 111
- Guest Operating Systems 112
- VMware, Inc. 113 113
- 114 VMware, Inc 114
- VMware, Inc. 115 115
- Upload a Customization Script 116
- VMware, Inc. 117 117
- 118 VMware, Inc 118
- VMware, Inc. 119 119
- 120 VMware, Inc 120
- VMware, Inc. 121 121
- 122 VMware, Inc 122
- VMware, Inc. 123 123
- 124 VMware, Inc 124
- VMware, Inc. 125 125
- 126 VMware, Inc 126
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