Re: [pve-devel] [PATCH storage] fix #3610: properly build ZFS detail tree

[Thomas Lamprecht <t.lamprecht@proxmox.com>]

On 07.09.21 11:30, Fabian Ebner wrote:
> Previously, top-level vdevs like log or special were wrongly added as
> children of the previous outer vdev instead of the root.
> 
> Fix it by also showing the vdev with the same name as the pool and
> start counting from level 1 (the pool itself serves as the root and
> should be the only one with level 0). This results in the same kind
> of structure as in PBS and (except for the root) zpool status itself.
> 
> Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
> ---
>  PVE/API2/Disks/ZFS.pm | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/PVE/API2/Disks/ZFS.pm b/PVE/API2/Disks/ZFS.pm
> index 0418794..60077c4 100644
> --- a/PVE/API2/Disks/ZFS.pm
> +++ b/PVE/API2/Disks/ZFS.pm
> @@ -240,8 +240,8 @@ __PACKAGE__->register_method ({
>  		$config = 1;
>  	    } elsif ($config && $line =~ m/^(\s+)(\S+)\s*(\S+)?(?:\s+(\S+)\s+(\S+)\s+(\S+))?\s*(.*)$/) {
>  		my ($space, $name, $state, $read, $write, $cksum, $msg) = ($1, $2, $3, $4, $5, $6, $7);
> -		if ($name ne "NAME" and $name ne $param->{name}) {
> -		    my $lvl= int(length($space)/2); # two spaces per level
> +		if ($name ne "NAME") {
> +		    my $lvl = int(length($space) / 2) + 1; # two spaces per level
>  		    my $vdev = {
>  			name => $name,
>  			msg => $msg,
> 

hmm, I get the idea and can see how one could assert that this is more correct,
but as it is presented it'd be a bit more confusing too, IMO, as it does not
matches the zpool status CLI output anymore.

I.e., the following (real):
>         NAME                                      STATE     READ WRITE CKSUM
>         zpt                                       ONLINE       0     0     0
>           mirror-0                                ONLINE       0     0     0
>             scsi-0QEMU_QEMU_HARDDISK_drive-scsi3  ONLINE       0     0     0
>             scsi-0QEMU_QEMU_HARDDISK_drive-scsi4  ONLINE       0     0     0
>         logs
>           scsi-0QEMU_QEMU_HARDDISK_drive-scsi5    ONLINE       0     0     0


Is suggested to be (adapted):
>         NAME                                      STATE     READ WRITE CKSUM
>         zpt                                       ONLINE
>           zpt                                       ONLINE       0     0     0
>             mirror-0                                ONLINE       0     0     0
>               scsi-0QEMU_QEMU_HARDDISK_drive-scsi3  ONLINE       0     0     0
>               scsi-0QEMU_QEMU_HARDDISK_drive-scsi4  ONLINE       0     0     0
>         logs
>           scsi-0QEMU_QEMU_HARDDISK_drive-scsi5    ONLINE       0     0     0


How about hiding the root in the devices tree and add a line to the
KV grid above instead? E.g., something that would then render:

Pool       <ID> (<STATUS>)

That can be a GUI change only, did not really checked implementation details, but
I'd like to clear that up before applying this patch.