Delay of 1 node for reconnection on nfs.

frankz · Apr 12, 2022

Hello everyone, problem already explained in the past.

In a three-node cluster, only one at restart takes about 1 mn to give me the valid connection to NFS network shares.

I attach image.

After that everything starts working again!

bbgeek17 · Apr 12, 2022

Sounds like a network layer issue. There could be a hundred different reasons, from flaky network cable to misconfigured MTU.
You should start with examining the log: journalctl -b
Continue with looking at network interface statistics, looking at errors.
Followed by running things in debug mode, like "pvestatd" and others.
A network trace analyses of initial connection would probably give you an immediate clue but it requires some advanced skills.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 12, 2022

bbgeek17 said:
Sounds like a network layer issue. There could be a hundred different reasons, from flaky network cable to misconfigured MTU.
You should start with examining the log: journalctl -b
Continue with looking at network interface statistics, looking at errors.
Followed by running things in debug mode, like "pvestatd" and others.
A network trace analyses of initial connection would probably give you an immediate clue but it requires some advanced skills.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

At the moment, thank you, I will try to check as directed by you.

frankz · Apr 12, 2022

bbgeek17 said:
Sounds like a network layer issue. There could be a hundred different reasons, from flaky network cable to misconfigured MTU.
You should start with examining the log: journalctl -b
Continue with looking at network interface statistics, looking at errors.
Followed by running things in debug mode, like "pvestatd" and others.
A network trace analyses of initial connection would probably give you an immediate clue but it requires some advanced skills.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

I checked the traceroute of the segment and it's correct:traceroute to 192.168.2.99 (192.168.2.99), 30 hops max, 60 byte packets
1 hpnas.internal2.lan (192.168.2.99) 0.608 ms 0.591 ms 0.583 ms
root@pve:~# traceroute 192.168.2.100
traceroute to 192.168.2.100 (192.168.2.100), 30 hops max, 60 byte packets
1 192.168.2.100 (192.168.2.100) 0.133 ms 0.123 ms 0.117 ms
The network cable is fine.

In the logs I tried this:

Apr 12 14:04:48 pve kernel: DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000007d000000-0x000000007f7fffff], >

Apr 12 14:04:48 pve kernel: x86/cpu: SGX disabled by BIOS.

Apr 12 14:04:48 pve kernel: r8169 0000:01:00.0: can't disable ASPM; OS doesn't have ASPM control

Apr 12 14:05:06 pve pmxcfs[2510]: [quorum] crit: quorum_initialize failed: 2

Apr 12 14:05:06 pve pmxcfs[2510]: [quorum] crit: can't initialize service

Apr 12 14:05:06 pve pmxcfs[2510]: [confdb] crit: cmap_initialize failed: 2

Apr 12 14:05:06 pve pmxcfs[2510]: [confdb] crit: can't initialize service

Apr 12 14:05:06 pve pmxcfs[2510]: [dcdb] crit: cpg_initialize failed: 2

Apr 12 14:05:06 pve pmxcfs[2510]: [dcdb] crit: can't initialize service

Apr 12 14:05:06 pve pmxcfs[2510]: [status] crit: cpg_initialize failed: 2

Apr 12 14:05:06 pve pmxcfs[2510]: [status] crit: can't initialize service

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 1 has no active links

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 (passive) best link: 0 (pri: 1)

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 has no active links

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 (passive) best link: 0 (pri: 1)

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 has no active links

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 (passive) best link: 0 (pri: 1)

Apr 12 14:05:08 pve corosync[2607]: [KNET ] host: host: 2 has no active links

Apr 12 14:04:52 pve systemd[1]: nfs-config.service: Succeeded.

Apr 12 14:05:23 pve kernel: FS-Cache: Netfs 'nfs' registered for caching

Apr 12 14:05:23 pve systemd[1]: nfs-config.service: Succeeded.

Apr 12 14:06:00 pve pvestatd[2649]: storage 'hpnas_nfs' is not online

Apr 12 14:06:10 pve pvedaemon[2729]: storage 'hpnas_nfs' is not online

Apr 12 14:06:11 pve pvedaemon[2728]: storage 'hpnas_nfs' is not online

root@pve:~#

bbgeek17 · Apr 12, 2022

Keep digging.
The error you are getting is based on "check_connection()" response from NFS Plugin.

NFS Plugin does:

Code:

sub check_connection {
    my ($class, $storeid, $scfg) = @_;

    my $server = $scfg->{server};
    my $opts = $scfg->{options};

    my $cmd;
    if (defined($opts) && $opts =~ /vers=4.*/) {
        my $ip = PVE::JSONSchema::pve_verify_ip($server, 1);
        if (!defined($ip)) {
            $ip = PVE::Network::get_ip_from_hostname($server);
        }

        my $transport = PVE::JSONSchema::pve_verify_ipv4($ip, 1) ? 'tcp' : 'tcp6';

        # nfsv4 uses a pseudo-filesystem always beginning with /
        # no exports are listed
        $cmd = ['/usr/sbin/rpcinfo', '-T', $transport, $ip, 'nfs', '4'];
    } else {
        $cmd = ['/sbin/showmount', '--no-headers', '--exports', $server];
    }

    eval { run_command($cmd, timeout => 10, outfunc => sub {}, errfunc => sub {}) };
    if (my $err = $@) {
        return 0;
    }

    return 1;
}

Find out what happens to rpcinfo and showmount. These are not PVE specific, its generic TCP/NFS layer of Linux. If you have 3 nodes and NAS, and only one node has an issue, the most logical explanation is that the problem is with that node.

Is network even up at the time of the probes? The log says that corosync is not happy with its network connectivity - is that the same link you are using for NFS?

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 12, 2022

bbgeek17 said:
Keep digging.
The error you are getting is based on "check_connection()" response from NFS Plugin.

NFS Plugin does:

Code:

sub check_connection { my ($class, $storeid, $scfg) = @_; my $server = $scfg->{server}; my $opts = $scfg->{options}; my $cmd; if (defined($opts) && $opts =~ /vers=4.*/) { my $ip = PVE::JSONSchema::pve_verify_ip($server, 1); if (!defined($ip)) { $ip = PVE::Network::get_ip_from_hostname($server); } my $transport = PVE::JSONSchema::pve_verify_ipv4($ip, 1) ? 'tcp' : 'tcp6'; # nfsv4 uses a pseudo-filesystem always beginning with / # no exports are listed $cmd = ['/usr/sbin/rpcinfo', '-T', $transport, $ip, 'nfs', '4']; } else { $cmd = ['/sbin/showmount', '--no-headers', '--exports', $server]; } eval { run_command($cmd, timeout => 10, outfunc => sub {}, errfunc => sub {}) }; if (my $err = $@) { return 0; } return 1; }

Find out what happens to rpcinfo and showmount. These are not PVE specific, its generic TCP/NFS layer of Linux. If you have 3 nodes and NAS, and only one node has an issue, the most logical explanation is that the problem is with that node.

Is network even up at the time of the probes? The log says that corosync is not happy with its network connectivity - is that the same link you are using for NFS?

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thanks, I will check shortly, however the migration network is on another segment the 192.168.9.x la192.168.2.x nfs. Your assumption is correct as it is only a node that signals this anomaly as well as delay (boot only). Once the drives are reconnected, everything works, migration, sync, VM to nfs, backup to PBS.

frankz · Apr 12, 2022

bbgeek17 said:
Keep digging.
The error you are getting is based on "check_connection()" response from NFS Plugin.

NFS Plugin does:

Code:

sub check_connection { my ($class, $storeid, $scfg) = @_; my $server = $scfg->{server}; my $opts = $scfg->{options}; my $cmd; if (defined($opts) && $opts =~ /vers=4.*/) { my $ip = PVE::JSONSchema::pve_verify_ip($server, 1); if (!defined($ip)) { $ip = PVE::Network::get_ip_from_hostname($server); } my $transport = PVE::JSONSchema::pve_verify_ipv4($ip, 1) ? 'tcp' : 'tcp6'; # nfsv4 uses a pseudo-filesystem always beginning with / # no exports are listed $cmd = ['/usr/sbin/rpcinfo', '-T', $transport, $ip, 'nfs', '4']; } else { $cmd = ['/sbin/showmount', '--no-headers', '--exports', $server]; } eval { run_command($cmd, timeout => 10, outfunc => sub {}, errfunc => sub {}) }; if (my $err = $@) { return 0; } return 1; }

Find out what happens to rpcinfo and showmount. These are not PVE specific, its generic TCP/NFS layer of Linux. If you have 3 nodes and NAS, and only one node has an issue, the most logical explanation is that the problem is with that node.

Is network even up at the time of the probes? The log says that corosync is not happy with its network connectivity - is that the same link you are using for NFS?

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

This is the result of showmount where VMs reside in NFS:
root@pve:/var/log# showmount 192.168.2.99

Hosts on 192.168.2.99:
192.168.2.33
192.168.2.34
192.168.2.37
root@pve:/var/log# showmount 192.168.2.100
Hosts on 192.168.2.100:
192.168.2.33
192.168.2.34
192.168.2.37
root@pve:/var/log#

Storage cfg:
root@pve:/etc/pve# less storage.cfg

dir: local
path /var/lib/vz
content backup,images,iso,vztmpl
prune-backups keep-last=3
shared 0

zfspool: local-zfs
pool rpool/data
content rootdir,images
nodes pve
sparse 0

nfs: nasforum
export /zroot/nfs
path /mnt/pve/nasforum
server 192.168.2.100
content vztmpl,images,rootdir
prune-backups keep-all=1

pbs: pbs
datastore ZFS_STORAGE
server 192.168.9.19
content backup
fingerprint d9:da:f3:38:76:1b:bd:8d:61:7c:fb:85:c3:b9:90:1f:00:9f:e8:cd:d9:43:4e:85:4e:2e:20:b8:dd:91:36:da
prune-backups keep-all=1
username root@pam

nfs: evo1tb
export /mnt/SSD1TB/evozfs
path /mnt/pve/evo1tb
server 192.168.2.100
content images,rootdir,vztmpl
prune-backups keep-all=1

pbs: PBS_WD
datastore ZFS_WD
server 192.168.9.19
content backup
fingerprint d9:da:f3:38:76:1b:bd:8d:61:7c:fb:85:c3:b9:90:1f:00:9f:e8:cd:d9:43:4e:85:4e:2e:20:b8:dd:91:36:da
prune-backups keep-all=1
username root@pam

lvmthin: data_lvm
thinpool data
vgname pve
content images,rootdir
nodes pve3,pve4

nfs: hpnas_nfs
export /zroot/nfs
path /mnt/pve/hpnas_nfs
server 192.168.2.99
content vztmpl,images,rootdir
prune-backups keep-all=1

zfspool: SSD1TB
pool SSD1TB
content images,rootdir
mountpoint /SSD1TB
nodes pve4

pbs: pbsusb500
datastore ZFS_USB500
server 192.168.9.19
content backup
fingerprint d9:da:f3:38:76:1b:bd:8d:61:7c:fb:85:c3:b9:90:1f:00:9f:e8:cd:d9:43:4e:85:4e:2e:20:b8:dd:91:36:da
prune-backups keep-all=1
username root@pam

bbgeek17 · Apr 12, 2022

Thats not very interesting. You need to run showmount and rpcinfo (preferably with the same options as the code snippet) directly on the node that has an issue specifically at the time right after boot and before the connection settles. If you can catch that window the commands should be failing but may be you'll get a helpful error message or some other clue.
Your window of troubleshooting is that one minute, everything else you run outside of it is useless. If there is nothing in log - you have to keep experimenting.
Have you looked at the network cards, is there a difference in model? firmware? bios settings?

good luck.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 12, 2022

bbgeek17 said:
Thats not very interesting. You need to run showmount and rpcinfo (preferably with the same options as the code snippet) directly on the node that has an issue specifically at the time right after boot and before the connection settles. If you can catch that window the commands should be failing but may be you'll get a helpful error message or some other clue.
Your window of troubleshooting is that one minute, everything else you run outside of it is useless. If there is nothing in log - you have to keep experimenting.
Have you looked at the network cards, is there a difference in model? firmware? bios settings?

good luck.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

So I understand that I have to restart the server and as soon as it gives me the error run the show Mount command. As for the show Mount command, could you give me the correct syntax to perform?

bbgeek17 · Apr 12, 2022

You dont need to wait for the error, start running commands as soon as you can login.

Create a script with relevant commands , run them in a loop.

Code:

#!/usr/bin/env bash
/usr/bin/ping -c4 {STORAGE_IP}
/usr/sbin/rpcinfo -T tcp  {STORAGE_IP} nfs 4
/usr/sbin/rpcinfo -T tcp  {STORAGE_IP} nfs 3
/sbin/showmount --no-headers --exports {STORAGE_IP}

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 12, 2022

bbgeek17 said:
You dont need to wait for the error, start running commands as soon as you can login.

Create a script with relevant commands , run them in a loop.

Code:

#!/usr/bin/env bash /usr/bin/ping -c4 {STORAGE_IP} /usr/sbin/rpcinfo -T tcp {STORAGE_IP} nfs 4 /usr/sbin/rpcinfo -T tcp {STORAGE_IP} nfs 3 /sbin/showmount --no-headers --exports {STORAGE_IP}

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Grazie per la tua gentilezza , appena possibile provo e ti terrò aggiornato . Al momento ho eseguito lo script su un cluster che uso come test , e i risultati sono questi :

Code:

root@pvetest:~# ./checknfs.sh
PING 192.168.3.42 (192.168.3.42) 56(84) bytes of data.
64 bytes from 192.168.3.42: icmp_seq=1 ttl=64 time=0.416 ms
64 bytes from 192.168.3.42: icmp_seq=2 ttl=64 time=0.177 ms
64 bytes from 192.168.3.42: icmp_seq=3 ttl=64 time=0.336 ms
64 bytes from 192.168.3.42: icmp_seq=4 ttl=64 time=0.364 ms

--- 192.168.3.42 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3035ms
rtt min/avg/max/mdev = 0.177/0.323/0.416/0.089 ms
program 100003 version 4 ready and waiting
program 100003 version 3 ready and waiting
/mnt/pub 192.168.3.0

I hope to try the one in production tonight. Thank you

frankz · Apr 13, 2022

bbgeek17 said:
You dont need to wait for the error, start running commands as soon as you can login.

Create a script with relevant commands , run them in a loop.

Code:

#!/usr/bin/env bash /usr/bin/ping -c4 {STORAGE_IP} /usr/sbin/rpcinfo -T tcp {STORAGE_IP} nfs 4 /usr/sbin/rpcinfo -T tcp {STORAGE_IP} nfs 3 /sbin/showmount --no-headers --exports {STORAGE_IP}

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Hi, I did what you told me. Here are the results:

Code:

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Apr 13 06:34:16 CEST 2022 from 192.168.3.33 on pts/1
root@pve:~# ./checknfs.sh
PING 192.168.2.100 (192.168.2.100) 56(84) bytes of data.
64 bytes from 192.168.2.100: icmp_seq=1 ttl=64 time=0.085 ms
64 bytes from 192.168.2.100: icmp_seq=2 ttl=64 time=0.178 ms
64 bytes from 192.168.2.100: icmp_seq=3 ttl=64 time=0.184 ms
64 bytes from 192.168.2.100: icmp_seq=4 ttl=64 time=0.185 ms

--- 192.168.2.100 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3047ms
rtt min/avg/max/mdev = 0.085/0.158/0.185/0.042 ms
program 100003 version 4 ready and waiting
program 100003 version 3 ready and waiting
rpc mount export: RPC: Timed out
PING 192.168.2.99 (192.168.2.99) 56(84) bytes of data.
64 bytes from 192.168.2.99: icmp_seq=1 ttl=64 time=0.630 ms
64 bytes from 192.168.2.99: icmp_seq=2 ttl=64 time=0.647 ms
64 bytes from 192.168.2.99: icmp_seq=3 ttl=64 time=0.699 ms
64 bytes from 192.168.2.99: icmp_seq=4 ttl=64 time=0.759 ms

--- 192.168.2.99 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3039ms
rtt min/avg/max/mdev = 0.630/0.683/0.759/0.050 ms
program 100003 version 4 ready and waiting
program 100003 version 3 ready and waiting
/zroot/nfs 192.168.2.0
root@pve:~#

VM 105 does not start because it resides on nfs.

Here are the nas parameters:

bbgeek17 · Apr 13, 2022

The output you provided does not give any timing reference or information about the state of the storage. And based on the output it seems that you have already missed the window.

If this is a production environment then you should start utilizing your vendor support channels, i.e. NAS and/or PVE.

If this is a home/lab environment you can either continue trying to catch the unavailability window or try to research more and implement one of the many workarounds already discussed in the forum:
https://forum.proxmox.com/threads/start-at-boot-and-shared-storage.26340/
https://forum.proxmox.com/threads/startup-delay-for-first-vm-with-remote-storage.60348/
etc

The red flag for me is that you only have the problem on one out of three nodes. If it was my environment, I would concentrate on finding differences between the nodes.

Good luck.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 13, 2022

bbgeek17 said:
The output you provided does not give any timing reference or information about the state of the storage. And based on the output it seems that you have already missed the window.

If this is a production environment then you should start utilizing your vendor support channels, i.e. NAS and/or PVE.

If this is a home/lab environment you can either continue trying to catch the unavailability window or try to research more and implement one of the many workarounds already discussed in the forum:
https://forum.proxmox.com/threads/start-at-boot-and-shared-storage.26340/
https://forum.proxmox.com/threads/startup-delay-for-first-vm-with-remote-storage.60348/
etc

The red flag for me is that you only have the problem on one out of three nodes. If it was my environment, I would concentrate on finding differences between the nodes.

Good luck.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thank you for your courtesy and technical information. I hope to find something or rather a clue that I bring you in the correct trade to solving the problem.

bbgeek17 · Apr 14, 2022

I came across this resources, I think it would be helpful for you to study as it may address your issue :
https://wiki.archlinux.org/title/NFS#Mount_using_.2Fetc.2Ffstab_with_systemd

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 15, 2022

bbgeek17 said:
I came across this resources, I think it would be helpful for you to study as it may address your issue :
https://wiki.archlinux.org/title/NFS#Mount_using_.2Fetc.2Ffstab_with_systemd

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thank you. I will give an in-depth reading on the docs, but reading quickly I understand that you should mount nfs manually. I find interesting what you wrote to me earlier, in particular to change the sleep delay declared on systemd, Maybe it is less invasive and imposes a small delay, what do you think? In addition, other users have had this problem. Thank you very much at the moment.

bbgeek17 · Apr 15, 2022

frankz said:
Thank you. I will give an in-depth reading on the docs, but reading quickly I understand that you should mount nfs manually.

You can but you shouldn't have to. If you do go that route you will need to do this across entire cluster. Its your choice if you want to use this approach as a band aid to the main issue you have.

frankz said:
I find interesting what you wrote to me earlier, in particular to change the sleep delay declared on systemd, Maybe it is less invasive and imposes a small delay, what do you think? In addition, other users have had this problem.

Ideally you will find what causes the delay (nic,firmware,cable,bios,switch port,cable, some extra software or setting you set and forgot about). If you cant and it bothers you enough - apply some sort of workaround.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

frankz · Apr 15, 2022

bbgeek17 said:
You can but you shouldn't have to. If you do go that route you will need to do this across entire cluster. Its your choice if you want to use this approach as a band aid to the main issue you have.

Ideally you will find what causes the delay (nic,firmware,cable,bios,switch port,cable, some extra software or setting you set and forgot about). If you cant and it bothers you enough - apply some sort of workaround.

Blockbridge: Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

I don't know, but technically I think about the process order of the services. Let me explain better:

It's as if the nfs storage service is not processed in the correct order. I could try to share a type of CIFS /samba storage through another server to understand if even with this service, connection times vary or remain the same.

Search

Search

Delay of 1 node for reconnection on nfs.

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