Bug 1127953
Summary: | [Docs] [PRD3.5] [3.5Beta] [Change] [Technical] Live snapshot deletion and merging | ||
---|---|---|---|
Product: | Red Hat Enterprise Virtualization Manager | Reporter: | Andrew Dahms <adahms> |
Component: | Documentation | Assignee: | Andrew Dahms <adahms> |
Status: | CLOSED CURRENTRELEASE | QA Contact: | Lucy Bopf <lbopf> |
Severity: | unspecified | Docs Contact: | |
Priority: | high | ||
Version: | 3.5.0 | CC: | alitke, amureini, ecohen, fsimonce, gklein, gpadgett, juwu, pdwyer, rbalakri, yeylon |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | Unspecified | ||
OS: | Unspecified | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | 1124107 | Environment: | |
Last Closed: | 2014-09-19 01:32:29 UTC | Type: | Bug |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | 1124107 | ||
Bug Blocks: | 1127943 |
Description
Andrew Dahms
2014-08-08 01:36:33 UTC
Hi Allon, Would you be able to take a look at the following link that talks about live snapshot deletion and let me know what you think? http://docbuilder.usersys.redhat.com/22767/#Snapshot_Deletion I have added a paragraph at the bottom that provides a very brief overview of the operation, but I suspect the diagram and the description of the snapshot deletion may need to be updated. Any input you could provide would be appreciated! Kind regards, Andrew wrt the first paragraph, deleting snapshots has two main purposes:
1. Improving performance of your VM
2. Freeing up space. We can't guarantee that removing a snapshot will indeed free up space, but chances are that it will - if both snapshosts being merged change the same data, the older version will be omitted, and you'll end up saving space.
> When you delete a snapshot, the data from the deleted snapshot and the snapshot created after the deleted snapshot are merged into a single COW volume
IMHO, you should use "QCOW", not "COW".
Adam/Greg/Federico - any other comments?
Nothing to add from my side. Hi Allon, Adam, Thank you for your feedback! I will rework the opening paragraph a little to include your comments. Kind regards, Andrew Documentation Link ------------------------------ http://documentation-devel.engineering.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5-Beta/html-single/Technical_Guide/index.html#Snapshot_Deletion What Changed ------------------------------ The following topic was revised to update the opening topic in accordance with feedback received above, and to add a new paragraph at the bottom of the topic that provides a brief overview of the back end behavior of the new snapshot deletion and merging behavior. Snapshot Deletion [13706-699637] Updated the revision history: [34616-691401] NVR ------------------------------ Red_Hat_Enterprise_Virtualization-Technical_Guide-3.5-Beta-en-US-3.5-5 Moving to ON_QA. Peer reviewed. The new paragraph has been added as per comment #6. It provides a succinct overview. The opening paragraph now refers to the potential for improved virtual machine performance, and explains the way in which space may or may not be freed by the operation. VERIFIED. |