Proxmox cannot access Unraid SMB share

[Steve087]

Hi

I have configured Proxmox to store isos and Templates as well as Backups on Unraid SMB shares. Unraid is configured to spin down the array disks after 1h of inactivity.

Proxmox never has an issue to access the templates folder. However it can after a certain time not read from the backup folder. So restoring backups is not possible, strangely enough I can create new backups just fine. The mounts for both shares are identical and the same is true on the Unraid side. I do not understand the difference.

First I thought it might be an issue with caching and disk spin doen on Unraid, but even after I wake up the disks with another SMB client Proxmox can still not read from the share and not see the backups:



Here is my config:

root@gateway:~# cat /etc/pve/storage.cfg
dir: local
        path /var/lib/vz
        content vztmpl,iso,backup

lvmthin: local-lvm
        thinpool data
        vgname pve
        content rootdir,images

cifs: nas-templates
        path /mnt/pve/nas-templates
        server nas.app
        share isos
        content vztmpl,iso
        prune-backups keep-all=1
        subdir /proxmox
        username blabla
        options cache=none

cifs: nas-backup
        path /mnt/pve/nas-backup
        server nas.app
        share backup-manual
        content backup
        prune-backups keep-all=1
        subdir /proxmox
        username blabla
        options cache=none

root@gateway:~#

I have already manually added the cache=none option. This first seemed to resolve the issue but after a reboot it's back.

root@gateway:~# mount | grep nas
//nas.app/isos/proxmox on /mnt/pve/nas-templates type cifs (rw,relatime,vers=3.1.1,cache=none,upcall_target=app,username=blabla,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.1.100,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,reparse=nfs,nativesocket,symlink=native,rsize=4194304,wsize=4194304,bsize=1048576,retrans=1,echo_interval=60,actimeo=1,closetimeo=1)
//nas.app/backup-manual/proxmox on /mnt/pve/nas-backup type cifs (rw,relatime,vers=3.1.1,cache=none,upcall_target=app,username=blabla,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.1.100,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,reparse=nfs,nativesocket,symlink=native,rsize=4194304,wsize=4194304,bsize=1048576,retrans=1,echo_interval=60,actimeo=1,closetimeo=1)

Thank you very much!

 

[Steve087]

umount /mnt/pve/nas-*
mount -a

temporarily solves the issue but it comes back after some time. I would like to have a permanent solution and I don't mean a cron-job...

 

[alexskysilk]

temporarily solves the issue

check logs on your smb serving device (unraid) around the time you get disconnected. most likely network issues.

 

[Steve087]

check logs on your smb serving device (unraid) around the time you get disconnected. most likely network issues.

Thanks for your answer.

I don't believe its a network issue. I have 2 promox nodes identically setup (clone) and both have the exact same issue and both only with the backup share. The 2 nodes and the NAS are on the same 2.5GE switch - there is basically no traffic <100mbps for Internet. I use the same NAS and the same switch for media streaming and I never ever had an issue with that, no stuttering no hiccups.

Here some logs from proxmox (I cant see anything amiss on Unraid):

Oct 01 18:28:59 gateway kernel: CIFS: Attempting to mount //nas.app/isos/proxmox
Oct 01 18:28:59 gateway kernel: CIFS: Attempting to mount //nas.app/backup-manual/proxmox
Oct 01 20:50:29 gateway pvestatd[1759]: unable to activate storage 'nas-backup' - directory '/mnt/pve/nas-backup' does not exist or is unreachable
Oct 01 20:50:39 gateway pvestatd[1759]: unable to activate storage 'nas-backup' - directory '/mnt/pve/nas-backup' does not exist or is unreachable
Oct 01 20:50:49 gateway pvestatd[1759]: unable to activate storage 'nas-backup' - directory '/mnt/pve/nas-backup' does not exist or is unreachable
...
...
Oct 01 21:31:50 gateway pvestatd[1759]: unable to activate storage 'nas-backup' - directory '/mnt/pve/nas-backup' does not exist or is unreachable
Oct 01 21:31:52 gateway systemd[1]: mnt-pve-nas\x2dbackup.mount: Deactivated successfully.
Oct 01 21:31:52 gateway systemd[1]: mnt-pve-nas\x2dtemplates.mount: Deactivated successfully.
Oct 01 21:31:59 gateway kernel: CIFS: Attempting to mount //nas.app/isos/proxmox
Oct 01 21:31:59 gateway kernel: CIFS: Attempting to mount //nas.app/backup-manual/proxmox
root@gateway:~#

Could this be a timing issue? But then why does it work the 2nd time after unmounting?

 

[alexskysilk]

I don't believe its a network issue

Oct 01 20:50:29 gateway pvestatd[1759]: unable to activate storage 'nas-backup' - directory '/mnt/pve/nas-backup' does not exist or is unreachable

I think you might want to re-evaluate the basis of troubleshooting from belief to, ahem, troubleshooting.

I cant see anything amiss on Unraid

Well that is the problem isnt it; maybe post those too?

 

[Steve087]

I think you might want to re-evaluate the basis of troubleshooting from belief to, ahem, troubleshooting.

Having 2 shares running over the exact same e2e network path both using the same src and dst ip address pair and only 1 out of 2 shares is affected and its always the same one is a very very unlikely network issue. Maybe first start with the troubleshooting on the new nodes and not on the infrastructure that has been running smoothly for multiple years?

Well that is the problem isnt it; maybe post those too?

SMB login on Unraid is disabled by default because SMB is very chatty. There was no need to enable this so far. So I don't have anything useful I could attach.