Term
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Definition
| A snapshot is a point in time image of a virtual machine |
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Term
| What are snapshots useful for? |
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Definition
| Testing software with unknown potential |
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Term
| What consistency options do you have with snapshots? |
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Definition
1. Crash consistent or
2. Application consistent |
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Term
| How do you create an application consistent snapshot? |
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Definition
| Quiescing the state of the VM will create an application consistent snapshot |
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Term
| What elements are preserved by a snapshot? |
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Definition
| VM Settings, Power state, disk state, memory sate (optional) |
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Term
| How many snapshots can each branch of a snapshot tree contain? |
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Definition
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Term
| Identify some business requirements for snapshots |
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Definition
| Change management, patching, software upgrades |
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Term
| Name some vSphere Requirements for snapshots |
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Definition
1. Raw disks, physical Device Mapping (RDM) disks or guest operating systems utilizing iSCSI software initiators are not supported
2. PCI Direct Path I/O devices are not supported
3. VMs with independent disks are only supported for snapshots when turned off
4. Snapshots are not supported for VMs that are configured for bus sharing |
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Term
| What options does a snapshot have the capability of reverting to - (parent, child, etc.) |
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Definition
| A snapshot can revert to any parent or child snapshot within the tree. |
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Term
| What is the primary requirement to quiesce the VM in order tot take an application consistent snapshot? |
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Definition
| VMware Tools to be installed on the VM |
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Term
| Describe the steps to take a Snapshot |
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Definition
In the VMs and templates view right click the VM and choose snapshot -> take snapshot
Give the SS a name and description
Select whether or not to snapshot a VMs memory
Select whether or not to quiesce the guest file system |
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Term
| What result does deleting a snapshot have? |
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Definition
Deleting Snapshots is basically committing all of the writes since the snapshot was changed. It removes the snapshot from the snapshot Manager and the snapshot files are consolidated and written to its' parent snapshot disk and merged with the Virtual Machine base disk. When you delete the base parent snapshot, all changes will merge with the base disk. This involves large amounts of disk reads and writes, which can most certainly reduce performance until it is complete (which can take a little bit of time depending on the size of the snapshots).
Source: blog.mwpreston.net |
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Term
| How do you delete snapshots? |
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Definition
Go to the VMs and templates view then right click your virtual machine and select the 'snapshot menu' and 'snapshot manager'. Select the snapshot that you want to delete. Click:
1. Delete if you want to remove and consolidate a single parent or child snapshot
2. Delete All to delete all snapshots for that virtual machine, writing changes from the child and parent disks all the way up to the base virtual machine disk |
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Term
| How do you delete snapshots? |
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Definition
Go to the VMs and templates view then right click your virtual machine and select the 'snapshot menu' and 'snapshot manager'. Select the snapshot that you want to delete. Click:
1. Delete if you want to remove and consolidate a single parent or child snapshot
2. Delete All to delete all snapshots for that virtual machine, writing changes from the child and parent disks all the way up to the base virtual machine disk |
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