Proxmox cannot access Unraid SMB share

Steve087

New Member
Sep 15, 2025
20
1
3
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:

1759346251760.png

Here is my config:

Code:
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.

Code:
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!
 
Last edited:
Code:
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...