Hi Fabian,

thanks for looking into this.

As I already mentioned yesterday my NFS setup tries to use TCP as much as 
possible so the only UDP port used / allowed in the NFS
servers firewall is udp/111 for Portmapper (to allow showmount to work).

>> Issue 1:
>> Backups failed tonight with "Error: mount error: mount.nfs: /mnt/pve/aurel 
>> is busy or already mounted".
>>
>> Question 1:
>> Do NFS shares that should be used for backups need to be "disabled" so that 
>> the backup process just mount the share in preparation
>> of the backup? If so, there is a problem with the WebUI as I cannot select a 
>> disabled storage location when defining or editing a
>> backup job.
>>
> 
> no. I think your NFS share is (wrongly) detected as unmounted, since
> activate_storage in the NFS plugin will try to mount if nfs_is_mounted
> returned undef. in general activate_storage is supposed to detect if the
> storage is already activated and turn into a no-op if needed, and
> calling storage can treat it as idempotent.
> 
> what does "grep aurel /proc/mounts" say on this machine?

# grep aurel /proc/mounts
<ip of server>:/backup/proxmox-infra /mnt/pve/aurel nfs
rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=<ip
 of
server>,mountvers=3,mountport=892,mountproto=tcp,local_lock=none,addr=141.58.1.15
 0 0

> 
>>
>> Issue 2:
>> When the backup process failed no email was sent to the specified address 
>> though email notification mode is set to "always".
>> Emails in general do work, at least apticron sends update notifications and 
>> sending mails from CLI also works.
>>
>> Question 2a:
>> Why was no email sent after the backup process failed?
>>
> 
> can you post the complete log?

Where can I find that?

> 
>> Question 2b:
>> Does the WebUI use a different method for sending emails? If so where can 
>> this be configured?
> 
> different from what?
> 

Different from what apticron and "echo test | mail -s test <recipient address>" 
use.

Regards,

        Uwe
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