Xen Orchestra Delta Restore
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Very cool, thank you for sharing. I still haven't had enough time to sit down and spin up a XO vm at home yet, but your threads on here have been eating away at me to get it done.
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@DustinB3403 said:
@Dashrender from multiple points during the process. Fulls and Partials result in a restore to that backup. Here's a picture of the CentOS NFS Share that list all that I created for the system.
I'm not sure this answers my question.
If you took a baseline image/backup 4 hours ago, then took a partial 2 hours ago, then another partial now, would the the second partial backup all of the changes since the baseline 4 hours ago, or from the partial from 2 hours ago?
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@Dashrender You can see in the screenshot above that there are delta's and full backup's created.
The partials copy the changes from whenever the full was last created.
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@DustinB3403 said:
@Dashrender You can see in the screenshot above that there are delta's and full backup's created.
The partials copy the changes from whenever the full was last created.
OK - thanks.
I really like the incremental forever solution I currently have.
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@scottalanmiller maybe I misunderstand it, so I'm asking for your expertise.
Wouldn't "Rolling Snapshots" in XO be the Forever incremental that @Dashrender is looking for?
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@DustinB3403 said:
@Dashrender You can see in the screenshot above that there are delta's and full backup's created.
The partials copy the changes from whenever the full was last created.
Calling them partials is really confusing. The industry terms are incrementals and differentials. These would be differentials then. If we use the right terms, there is no ambiguity.
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@DustinB3403 said:
@scottalanmiller maybe I misunderstand it, so I'm asking for your expertise.
Wouldn't "Rolling Snapshots" in XO be the Forever incremental that @Dashrender is looking for?
I've not looked at that feature. Do you have a link to their documentation on it?
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@scottalanmiller said:
@DustinB3403 said:
@Dashrender You can see in the screenshot above that there are delta's and full backup's created.
The partials copy the changes from whenever the full was last created.
Calling them partials is really confusing. The industry terms are incrementals and differentials. These would be differentials then. If we use the right terms, there is no ambiguity.
I used the term partial because until Dustin's post in the XO thread if they were incrementals or differentials.
though as usual, you're right
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Here it is. https://xen-orchestra.com/docs/rolling_snapshots.html
This is really what it sounds like and not backups at all. You could use it to build your own backup solution, but on its own it isn't one. It is just snapshots for version rollback locally.
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Guys,
You should ping me or create GitHub issues when you have concerns, bug report or questions about XO
For the restore without knowing what's happening: I just updated this yesterday, now the VM is named "[Importing...] VMname" until the restore is completed. See https://github.com/vatesfr/xo-web/issues/641
Already closed, so out for 4.12 around Jan 15
About "Forever forward incremental backup", allowing you to avoid any full export after the initial one, it consists of:
- merging offline (ie: without Xen, by ourselves) the original full backup with its contiguous snaphot
- doing step each time, step by step
So you never need to re-export the full stuff after the first time. A good illustration here, from VEEAM:
This should be out in 4.13 (end of Jan.), 4.12 with some luck.
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@olivier sorry Olivier we know you're busy, and I'm the defacto "XS Fan here...." so I play with a lot of the fun stuff and post some cool topics.
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LOL, just ask and ye shall receive.
Awesome @olivier
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Though a question to Scott's point - are vib files backup files or are they Xen image snaps?
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@Dashrender said:
Though a question to Scott's point - are vib files backup files or are they Xen image snaps?
Those are Veeam backups. He's just using their diagram.
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@scottalanmiller said:
@Dashrender said:
Though a question to Scott's point - are vib files backup files or are they Xen image snaps?
Those are Veeam backups. He's just using their diagram.
oh yeah /headslap, but the question still stands to your original point.
@scottalanmiller said:
Here it is. https://xen-orchestra.com/docs/rolling_snapshots.html
This is really what it sounds like and not backups at all. You could use it to build your own backup solution, but on its own it isn't one. It is just snapshots for version rollback locally.
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Yes, that was just VEEAM diagrams
The delta files
*.vhd(if it's the original question) are just "blocks" diff between two disk "states": a "moving" disk (the current VM disk) and a snapshot (which is "frozen", like a photo, that's the definition of a snapshot).To restore it properly, you need to be sure you "inject" the delta inside a coherent VM disk (if you apply delta on a different disk, it will be a mess. Even if you inject a delta on the "wrong" disk state, a mess too).
That's why we got JSON files to indicate the snapshot chain. We'll apply each delta to stay consistent.
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@DustinB3403 No worries
But if you need an explanation on any XOA stuff, feel free to ping me. I'll come if I can -
It is really nice to have one of the developers in the community! That cleared up a lot of confusion really quickly.
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@olivier I'm glad you were changing the Import function of the backup so that there is some indication of when the import is complete.
That was an annoyance to say the least, having to wait for the vDisk to appear.
