THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Page History
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| Disk-only Snapshot | Disk-only Snapshot | Memory-Disk snapshot |
|---|---|---|---|
Xenserver Free Edition | Yes | Yes | No |
Xenserver Enterprise Edition | Yes | Yes | Yes |
KVM | No | Yes | Yes |
VMware | Yes | Yes | Yes |
VM Snapshot deletion
- Deleting a snapshot should not have any impact to its subsequent snapshots
- Snapshots will be destroyed when VM is destroyed
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- when create or delete a VM snapshot, used capacity of the snapshot is re-calculated and an event is published for each of VM's volume, the size of memory image is added to ROOT volume
because volume could reside on different kind of storage pool, which suggests VM snapshot usage is tracked on a volume basis, a usage record will include: volume_id, zone_id, account_id, domain_id, vm_id, size, disk_offering, startdate and enddate
Restriction on VM with vmsnapshots
- attach/detach volume to/from this VM is not allowed
- attach/detach this VM to/from network is not allowed.
- volume resize for this VM is not allowed.
- change offering is not allowed.
- volume snapshot is not allowed, which is not major use case, we may revisit this later
- volume migration for this VM is not allowed
- VM storage migration for this VM is not allowed
- VM scale for this VM is not allowed.
Architecture and Design description
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New tables: vm_snapshots (only import columns are listed here)
column | comment |
|---|---|
id | primary key, auto-increment |
uuid | unique key |
name | unique internal name generated by system, like i-2-58-TEST_VS_20121118140427 |
display_name | snapshot name provided by user when creating VM snapshot |
description | a short description provided by user when creating VM snapshot |
account_id | owner |
domain_id |
|
vm_snapshot_type | enum {Disk, DiskAndMemory} |
state | VM snapshot state |
parent | parent VM snapshot Id |
current | if this VM snapshot is current |
vm_id | VM id |
updated |
|
created |
|
revmoed |
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HighLevel WorkFlow
VMSnapshot state machine
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Revert to previous snapshot when VM is (running, stopped)
Create multiple VM snapshot with snapshotMemory (on, off, mixed) for (vmware, xenserver, KVM) when VM is (running, stopped), the snapshots should form a tree hierarchy, such as:
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Revert to any snapshots in the tree when VM is (running, stopped)
Delete (current, any, all) VM snapshots for (vmware, xenserver, KVM)
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