Native Ceph RBD SM driver for XCP-ng
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@psafont thanks for the reply, but isn't that 16 year old logic part of XAPI? I mean - this same hacky logic is present in SMAPIv3 isn't it?
I was going through SMAPIv3 docs and from SM driver perspective (feature-wise) it doesn't seem much different, it looks to me more like many cosmetic changes that make packaging and modularization easier (definitely a good thing), but don't really change any fundamental SM logic - the RPCs are all same as in SMAPIv1, even porting my own driver is probably going to be pretty trivial, it's just about splitting it into multiple files and add some wrappers around it, but it still won't solve my problem - the rollback RPC is just not there, so I would need to instead support this "rollback by making another snapshot of a snapshot" logic enforced by XAPI
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@benapetr You're right. Unfortunately, there's no VDI revert that allows the revert to happen '. This is shown in the documentation: https://xapi-project.github.io/new-docs/toolstack/features/snapshots/index.html (see revert section)
There's an old proposal to do add this: https://xapi-project.github.io/new-docs/design/snapshot-revert/index.html
But the effort fizzed out because currently the imports do not set the snapshot_of correctly, and the operation needs to work even if the field is not set correctly, as it is now. (falling back to the current code seems sensible) https://github.com/xapi-project/xen-api/pull/2058
This needs some effort to get fixed, I'll set up some ticketing so it can be prioritized accordingly.
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This post is deleted! -
The author of the main recent effort is basically the person who posted just before you
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@olivierlambert you basically replied just after that I noticed that and deleted my message...
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Nothing fruitful to add....
But...
Oooof....
This will be somewhat messy to clean up. I'm rooting for you guys though!!
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There's some nice progress on @psafont's work regarding improved revert. I'm confident we'll get there
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Hello,
Thanks for your work !
We have some hypervisors of tests at Gladhost, we can use them with pleasure to test your work on xcp-ng 8.3 !
Best regards
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@benapetr Good news, seems like the latest version for SM will implement vdi_revert which should work nicely with Ceph RBD. The only thing now is to have the newer Ceph kernel drivers in XCP-ng since the current driver is very old... (v12 I believe, we're now at v20, soon v22)
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Hello @Maelstrom96.
This should be possible in the future version of XCP-NG built on top of alma 9
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It's more like "partially"/loosely based on Alma (10, not 9). And yes, the kernel will be far more recent, same for Xen and so on.
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