[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC V9 1/4] domain snapshot terms
On Tue, 2014-12-16 at 14:32 +0800, Chunyan Liu wrote: > Changes to V8: > * add a document for domain snapshot related terms, they will be > referred in later documents. > > ===================================================================== > Terms > > * Active domain: domain created and started > > * Inactive domain: domain created but not started As Wei says I think you mean "defined" here, since created and started are (essentially) synonyms for some toolstacks. You'll probably want to define "defined" too for clarity. > > * Domain snapshot: > > Domain snapshot is a system checkpoint of a domain. It contains > the memory status at the checkpoint and the disk status. > > * Disk-only snapshot: > > Disk-only snapshot only keeps the status of disk, not saving > memory status. > > Contents of disks (whether a subset or all disks associated with > the domain) are saved at a given point of time, and can be restored > back to that state. On a running guest, a disk-only snapshot is > likely to be only crash-consistent rather than clean (that is, it > represents the state of the disk on a sudden power outage); on an > inactive guest, a disk-only snapshot is clean if the disks were > clean when the guest was last shut down. There is the possibility of doing clean snapshots if a guest agent is involved to quiesce the disks at the right moment (e.g. I believe qemu has such a thing, or at least I've seen talks about it being developed at conferences). Are you including this possibility or explicitly ruling it out of scope? > * Live Snapshot: > > Like live migration, it will increase size of the memory dump file, > but reducess downtime of the guest. > > * Internal Disk Snapshot > > File formats such as qcow2 track both the snapshot and changes > since the snapshot in a single file. > > * External Disk Snapshot > > The snapshot is one file, and the changes since the snapshot > are in another file. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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