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fix(web/blog/overlay-store): another editing pass

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Add a bit more information, callouts to prevent people potentially
bricking their laptops.

Also change the performance section, we will

Change-Id: Id516c4bb0f0c2cbe99db86199b91c7d68becdd44
Reviewed-on: https://cl.snix.dev/c/snix/+/30254
Autosubmit: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
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Florian Klink 2025-03-23 01:23:28 +00:00 • committed by clbot
parent 754cbbe4ad
commit 1fab06d851
2 changed files with 35 additions and 14 deletions
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17
web/content/blog/2025-03-21-overlay-store/index.md
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@ -14,18 +14,19 @@ homepage: false
## Background
About a year ago, nix introduced a new experimental store type:
About a year ago, Nix introduced a new experimental store type:
[Local Overlay Store]. This store allows having multiple physical stores acting
as a single logical store.
With this approach, stores are layered on top of each other with all but the
top-most layer being writable, the others are read-only. The feature is
described in the [Upstream Nix Documentation][Local Overlay Store]. Work is
[ongoing][lix-local-overlay] to bring the feature to Lix aswell.
top-most layer being writable, the others are read-only. Nix will build inside
the top-most layer.
The feature is described in the [Upstream Nix Documentation][Local Overlay Store].
Work is [ongoing][lix-local-overlay] to bring the feature to Lix aswell.
The main use-case is for it is having a large nix store mounted onto a machine
as read-only and configure nix to use data stored in it to avoid
rebuilding/substituting from `cache.nixos.org`.
The main use-case is for it is having a large Nix store mounted onto a machine
as read-only and having Nix not rebuild/substitute store paths available in
lower layers.
Due to implementation details of this feature, the lower layer(s) can not only
be a location on the file system but also have another `nix-daemon` back the
@ -62,7 +63,7 @@ multiple `snix` components.
Stay tuned.
[castore]: https://snix.dev/docs/components/overview/
[castore]: {{< ref "/docs/components/overview.md" >}}
[bugs]: https://git.snix.dev/snix/snix/issues
[Local Overlay Store]: https://nix.dev/manual/nix/2.26/store/types/experimental-local-overlay-store.html
[replit]: https://blog.replit.com/tvix-store