backup finish failed: command error: unable to update manifest blob

[GordonFre]

Hello,
I am running always in this error on a datastore on an UNRAID machine.

The following error is shown after backup is on 100 %:
ERROR: Backup of VM 1018 failed - backup finish failed: command error: unable to update manifest blob - unable to load blob '"/mnt/bin_tower/ns/DATACENTER/vm/1018/2025-06-05T16:57:49Z/index.json.blob"' - Invalid argument (os error 22)

I already tried to create a new namespace but no change.

The mount to datastore I change already all options - no change either.

Anybody an Idea?

Thx a lot

 

[fabian]

what kind of storage is backing your datastore? how is PBS accessing it?

 

[GordonFre]

Hey,
It's a SMB-share on a UNRAID Server

Mount in fstab on pbs

//IP/Proxmox /mnt/bin_tower cifs credentials=XXX,rw,relatime,vers=3.1.1,cache=none,uid=0,noforceuid,gid=0,noforcegid,file_mode=0660,dir_mode=0770,soft,nounix,noserverino,mapposix,noperm,rsize=1048576,wsize=1048576,bsize=1048576,retrans=1,echo_interval=60,actimeo=0,closetimeo=1 0 0

 

[fabian]

okay.. so for some reason, opening the manifest that was uploaded right before fails.. that sounds like some caching issue related to your unraid setup..

basically what happens is

client uploads manifest
server writes it to temporary file
server renames it into final path
client calls finish
server tries to open manifest to add upload stats
-> open on the manifest path fails

 

[GordonFre]

hmmm.. but there is nothing I can change on UNRAID setup.
I only save backups on one HDD - so no split either

 

[fabian]

you could try playing around with your mount settings:
- cache strict instead of none
- dropping nounix and noserverino and mapposix

 

[GordonFre]

I changed to nfs.. works

 

[der-felix]

@GordonFre how did you NFS mount in fstab? I got the same problem, smb mount im fstab worked fine until the last unraid update, now I get the same error.
This is my current fstab entry

//10.23.91.175/PBS_Neu /mnt/unraid_pbs_neu cifs vers=3.0,credentials=/etc/samba/.smb-unraid-creds,uid=34,gid=34,defaults 0 0

I tried NFS before with this line but no luck

10.23.91.175:/mnt/user/PBS_Neu /mnt/unraid_pbs_neu nfs defaults 0 0

My NFS share config on the unraid side was

10.23.91.195(sec=sys,rw,anonuid=0,anongid=0,no_root_squash,no_subtree_check)

The unraid share is a ssd cache so no split between drives or mover. I think with unraid 7.0.1 it was ok and after updating to 7.1.4 or broke