I noticed the problem described below after updating TrueNAS Scale 25.10.1 to version 25.10.2. I’ll call this server TS2.
I synchronise files between my computer and TrueNAS Scale using FreeFileSync. The comparison is based on the file name and date. Whilst overwriting files on the TS server, it turned out that some files and folders did not have write permissions.
I checked these suspicious files and folders from Windows. These files had no write or read permissions and no owner assigned. It was as if I didn’t have permission to view the permissions. I tried to assign permissions from Windows but didn’t have administrator privileges.
On TS2, I recursively reassigned ownership to the user on these resources in SMB.
This did not resolve the issue.
I performed a data scrub. This resolved the issue, unfortunately only temporarily.
After some time, I updated TS2 to version 25.10.2.1.
And the problem returned. Some folders lost their original Windows permissions.
A pattern was noticed. This only affected certain folders whose names ended in ‘.com’. It also affects some files with the ‘.msi’ extension. One ‘.dll’ file was affected.
There are many files and folders that match the above pattern and there are no issues with them.
For comparison, I am using an old TrueNAS 13.0.U06. I will call this server TS1. On this old server, I am performing the same synchronisation in the same way. The aforementioned problems do not occur.
I checked the ZVOL status on TS1. There are no errors.
I checked the file and folder permissions using getfacl. The user has RWX permissions, the group has RWX, and others have —. So the permissions are the same for all files and folders.
Technical specifications:
TS1:
Motherboard: SuperMicro X10SDV-TLN4F
CPU: Intel® Xeon® Processor D-1541
Dual 10GbE
Dual 1GbE
Single 1GbE IPMI
RAM: 128 GB (4x32GB DDR4 ECC UDIMM)
HDD 8x18 GB unencrypted 1xVDEV RAIDZ2 (Seagate SATA SED) via HBA 9400-8i SAS SATA
2x SSD 32 GB Mirror for OS
Case: Fraktal Design Node 804
Power: be quiet SFX 600W 80+ Gold
TrueNAS 13.0.U06 long history of updates.
TS2: TEST
Motherboard: Asrock TRX50 WS
CPU: AMD Threadripper PRO 9955WX
Single 1GbE
Single 10GbE
Dual 25GbE X810
RAM: 256GB (4x64GB DDR5 ECC V-Color 6000MT/s)
12x 24 GB encrypted HDDs in 2xVDEV and 6x HDD RAIDZ2 (Seagate SATA) via HBA 9500-16i SAS SATA
1x 24 GB spare HDD
2x 512 GB SSDs in mirror for OS (SATA)
3x 2TB NVMe SSDs in SVDEV mirror
GT710 2 GB DDR3
Case: Fraktal Define 7 XL
Power: be quiet! Dark Power Pro 12 1200W 80+ Titanium
TrueNAS Scale 25.10.2.1 (start 25.04.2.6)