[Nix-dev] ZFS on NixOS regarding the `/etc/zfs/zpool.cache` file.

[Ricardo M. Correia]

I commented on that commit, but just in case, for future readers:

If you add:

boot.supportedFilesystems = [ "zfs" ];

... to your configuration.nix, then /etc/zfs will be created, and
/etc/zfs/zpool.cache will also be created when you import or create a ZFS
pool.

If you have this option in your configuration.nix and import a pool but
even so, zpool.cache isn't created, please file a new issue in the nixpkgs
github repository.

(BTW, you can also, you can use the "zdb -e" option to invoke zdb on pools
that don't have a cache file, but it's better to add "zfs" to the list of
supported filesystems).



On Tue, Apr 28, 2015 at 6:11 AM, Roger Qiu <roger.qiu at polycademy.com> wrote:

> Hello,
>
> I found the commit relating to my problem:
>
> https://github.com/NixOS/nixpkgs/commit/12e77fdc3f6f223be1a4d5c88d6c79bff63ae70c#commitcomment-10932244
>
> I made a comment regarding the lack of zpool.cache file. It's required
> for `zdb` to work. Perhaps we can generate the `zpool.cache` file at
> startup?
>
> Thanks,
> Roger
>
> On 28/04/2015 3:22 PM, Roger Qiu wrote:
> > Hi,
> >
> > To people using ZFS on NixOS, does your `zdb` command work?
> >
> > I tried using `zdb` and it just gives:
> >
> > ```
> > cannot open '/etc/zfs/zpool.cache': No such file or directory
> > ```
> >
> > This file `/etc/zfs/zpool.cache` file does not exist if you follow the
> > instructions regarding installing ZFS on NixOS.
> >
> > This line
> >
> https://github.com/NixOS/nixos/blob/master/modules/tasks/filesystems/zfs.nix#L6
> > hints that the current ZFS package doesn't handle the
> > `/etc/zfs/zpool.cache` file.
> >
> > What's missing, and how would we set up the `zpool.cache` file?
> >
> > Thanks,
> > Roger
> >
> >
> > --
> > Founder of Matrix AI
> > http://matrix.ai/
> > +61420925975
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