Re: [pve-devel] [PATCH storage v2] api: disks: zfs: enable monthly scrub when creating a pool

[Stoiko Ivanov <s.ivanov@proxmox.com>]

On Tue, 27 Aug 2024 16:24:33 +0200
Maximiliano Sandoval <m.sandoval@proxmox.com> wrote:

> And disable it when destroying the pool.
> 
can be fine in general - but why?
our packages ship:
/etc/cron.d/zfsutils-linux (and /usr/lib/zfs-linux/scrub)
which does (afair) run a monthly scrub (and trim) under certain conditions
(including by default on healthy pools)

what do we gain by explicitly enabling a unit for scrubbing (which at
least from experiences with the per-pool import unit, will cause odd
warnings in the journal, resulting in support requests)?



> Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
> ---
> 
> Differences from v1:
>  - Add --now flag to commands so they are `started` on top of `enabled`.
a short explanation on why this is/was necessary would help (maybe even
with a link to the relevant documentation e.g.:
https://documentation.suse.com/smart/systems-management/html/systemd-working-with-timers/index.html#systemd-timer-manage


> 
> 
>  src/PVE/API2/Disks/ZFS.pm | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/src/PVE/API2/Disks/ZFS.pm b/src/PVE/API2/Disks/ZFS.pm
> index 6fb6bd6b..6d9ace5b 100644
> --- a/src/PVE/API2/Disks/ZFS.pm
> +++ b/src/PVE/API2/Disks/ZFS.pm
> @@ -490,6 +490,13 @@ __PACKAGE__->register_method ({
>  		run_command($cmd);
>  	    }
>  
> +	    if (-e '/lib/systemd/system/zfs-scrub-monthly@.timer') {
> +		my $scrubtimer = 'zfs-scrub-monthly@'. PVE::Systemd::escape_unit($name, undef) . '.timer';
> +		$cmd = ['systemctl', 'enable', $scrubtimer, '--now'];
> +		print "# ", join(' ', @$cmd), "\n";
> +		run_command($cmd);
> +	    }
> +
>  	    PVE::Diskmanage::udevadm_trigger($devs->@*);
>  
>  	    if ($param->{add_storage}) {
> @@ -583,6 +590,11 @@ __PACKAGE__->register_method ({
>  		    run_command(['systemctl', 'disable', $importunit]);
>  		}
>  
> +		if (-e '/lib/systemd/system/zfs-scrub-monthly@.timer') {
> +		    my $scrubtimer = 'zfs-scrub-monthly@' . PVE::Systemd::escape_unit($name) . '.timer';
> +		    run_command(['systemctl', 'disable', $scrubtimer, '--now']);
> +		}
> +
>  		run_command(['zpool', 'destroy', $name]);
>  
>  		my $config_err;



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