add 2025 directory

2026-09-26 13:31:01 +00:00 · 2025-06-20 12:17:37 +02:00
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+# Migration Geodesic ZFS
+
+----
+
+# Needs
+![intro](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/6a97572d1bf17094e56d38d78c1006eb/intro.png =500x)
+
+----
+
+# Summary
+- Rsync
+    - Offline migration (data files)
+    - Online migration (dumps)
+- Snapshots
+    - Virtual Machines
+    - ZFS/BTRFS
+    - Container-based solutions
+
+----
+
+## rsync/scp : offline migration
+
+![rsync 1](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/a0305422abc056b2b03244cf9b08e678/rsync_1.png)
+
+----
+
+## rsync/scp : online migration
+![rsync 2](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/8b93709e86166a3078fb4981ea649309/rsync_2.png)
+
+----
+
+## rsync/scp
+#### Possible practical issues :
+- File permissions
+- Postgres permissions
+- SSH keys
+- Configuration mismatch
+
+<!--- Static files : `rsync` or `scp` --->
+```diff
+ No big architectural changes
+- Lots of configuration
+- Heavy : will take time to backup and restore
+- Hacky ?
+```
+
+----
+
+## Snapshots
+
+![gitflow1.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/bd9f6a847e821531acde7831c3afa9c7/gitflow1.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow2.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/98b95ac5511be266098338fa9197288c/gitflow2.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow3.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/ab3e6403503c24eb218c9af7a4b8b2f5/gitflow3.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow4.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/f4da1dc71b31e7f4dfc30e724ad1d826/gitflow4.svg =100%x)
+
+----
+
+### Virtual Machine cloning
+```diff
+- Must fiddle with hypervisor
+- We don't want to nest virtual machines
+```
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-000-nocow.gif)
+> Conventional Filesystem
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-001-data-comet.gif)
+> Copy on write (CoW)
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-002-data-worm.gif)
+> Simplified CoW representation
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-003-visualizing-snapshots.gif)
+> Snapshots using CoW
+
+----
+
+### ZFS
+#### Tools : 
+- [zrepl](https://zrepl.github.io/quickstart.html)
+- [syncoid](https://github.com/jimsalterjrs/sanoid/wiki/Syncoid)
+```diff
+ Automatic / Seamless
+- Possible use of untested additional tools/programs
+- Additional system complexity 
+```
+
+----
+
+### Container-based solutions
+#### LXD
+- Hypervisor for Linux Containers (LXC) and virtual machines
+- Can use ZFS
+- Canonical maintaned
+
+
+```diff
+ Automatic / Seamless
+- Additional architectural complexity 
+```
+
+----
+
+#### Kubernetes Volume Cloning
+
+```diff
+ Automatic / Seamless
+- Additional architectural complexity 
+- Definitely Hacky
+- Kubernetes
+- Better handled with operators/pods
+```