VM shows 0.0% disk usage

[Amadex]

Hello, my VM shows 0.0% disk usage and it's a 50GB VM in production (sites, emails, etc.). Qemu Guest Agent is installed. What could it be wrong? It's on a rented dedicated server.

 

[datschlatscher]

At the moment, disk usage for VMs is not tracked and therefore this value is always displayed as 0%.

There is still an active issue on this problem. Please see this issue on our bug tracker for more information or if you want to contribute.

 

[Amadex]

At the moment, disk usage for VMs is not tracked and therefore this value is always displayed as 0%.

There is still an active issue on this problem. Please see this issue on our bug tracker for more information or if you want to contribute.

Thanks for the answer. I've switched from Microsoft Hyper-V to Proxmox, so questions questions.

 

[Deepen Dhulla]

Work-Around Fix for Ceph-Storage Usage for VM Usage in Proxmox Virtual Environment (PVE) Cluster.
Would submit the code in bugzilla too (will have to check Development guideline too)
and would be working on ZFS storage too, soon ; as its another popular in PVE Cluster setup,
sharing it if any one want to refer and want to use and want to give feedback.

Introduction:

This document provides step-by-step instructions on implementing a
work-around fix for Ceph-storage utilization in a Proxmox Virtual Environment (PVE) cluster.
Specifically, this fix addresses the issue of displaying boot disk usage for virtual machines (VMs),
including snapshot space, in a Ceph storage configuration.


Procedure:

1. Backup the Original Perl File:
Before making any changes, it is crucial to create a backup of the original Perl file for safety purposes.

cp /usr/share/perl5/PVE/QemuServer.pm /opt/QemuServer-original-`date +%Y-%m-%d-%s`.pm

2. Edit the Perl File:
Open the Perl file for editing. You can use any text editor, but we will use the example of using the vi editor.

vi /usr/share/perl5/PVE/QemuServer.pm

Inside the editor, locate the line containing "{disk}" (approximately around line 2944).

3. Modify the Perl Code:

You will see the following code block:

my $size = PVE::QemuServer::Drive::bootdisk_size($storecfg, $conf);
if (defined($size)) {
    $d->{disk} = 0; # no info available
    $d->{maxdisk} = $size;
} else {
    $d->{disk} = 0;
    $d->{maxdisk} = 0;
}

After the comment line "# no info available," add the following code to retrieve disk usage from the Ceph pool for VMs:

##### CODE TO FETCH VM DISK USAGE FROM CEPH POOL START #####
my @bootdiskorder = split('=', $conf->{boot});
my @bootdiskname = split(';', $bootdiskorder[1]);
my @bootdiskinfo = split(",", $conf->{$bootdiskname[0]});
my @bootdiskdetail = split(":", $bootdiskinfo[0]);
my $bootdiskstorage = $bootdiskdetail[0];
my $bootdiskimage = $bootdiskdetail[1];

if (defined $storecfg->{ids}->{$bootdiskstorage}->{type}) {
    my $bootdisktype = $storecfg->{ids}->{$bootdiskstorage}->{type};
    my $bootdiskpool = $storecfg->{ids}->{$bootdiskstorage}->{pool};

    if ($bootdisktype eq "rbd") {
        my $cephrbddiskinfocmd = "rbd disk-usage -p " . $bootdiskpool . " " . $bootdiskimage . " --format=json";
        my $cephrbddiskinfo = `$cephrbddiskinfocmd`;
        $cephrbddiskinfo =~ s/\n/""/eg;
        $cephrbddiskinfo =~ s/\r/""/eg;
        $cephrbddiskinfo =~ s/\t/""/eg;
        $cephrbddiskinfo =~ s/\0/""/eg;
        $cephrbddiskinfo =~ s/^[a-zA-z0-9,]//g;
        my $total_used_size = 0;

        if ($cephrbddiskinfo =~ /$bootdiskimage/) {
            my $cephrbddiskinfoarray = decode_json($cephrbddiskinfo);
            foreach my $image (@{$cephrbddiskinfoarray->{'images'}}) {
                if (defined $image->{'used_size'}) {
                    $total_used_size += $image->{'used_size'};
                }
            }
            $d->{disk} = $total_used_size;
        }
    }
}
##### CODE TO FETCH VM DISK USAGE FROM CEPH POOL END #####

4. Restart the pvestatd Service:

After making the necessary changes, restart the pvestatd service to apply the modifications.

systemctl restart pvestatd.service

5. Check for Errors:

Monitor the system logs for any potential errors to ensure that the changes were applied without issues.

tail -f /var/log/syslog

6. Verify Disk Usage:

If everything is functioning correctly, you should now be able to see the disk usage, including boot disk usage and percentage used, for VMs when they are in the "ON" state.


I hope it help some, and we get feedback too.
Thanks in advance.
-Deepen.

 

[mithrandir_63]

Hello everybody,

Thank you very much for the post and the solution.
But after seriously following it step by step, it didn't work for me.

I'm digging up this post! !
here are 3 screenshots:
- the code inserted in the "QemuServer.pm" file



- the table with all the vms where we can clearly see that disk usage is anamorally at 0%.
we see that on the other hand it still works correctly for the “LXC” container :




- the results of "tail -f /var/log/syslog" which shows the absence of log files and therefore no bug! ! !



Thank you in advance for your help.

Sincerely
@+++

 

[Deepen Dhulla]

I hope your storage uses Ceph RBD, as the code is currently designed exclusively for Ceph Storage (I will publish ZFS Storage compatibility soon), authored by me. Additionally, for syslog, which is not installed by default in PVE8, you will need to install the rsyslog package.