Unable to write to a folder on a drive on AiX system

I logged in the server with the below user id. myhost:hkgdb:/wd/user1>id uid=214(user1) gid=321(dba) groups=1(staff) I'm getting the following error while writing to a file: myhost:hkgdb:/wd/user1>touch /backup/myhost/test.touch touch: 0652-046 Cannot create /backup/myhost/test.touch. I see that I have good permissions on the folder. myhost:hkgdb:/wd/user1>ls -ld /backup drwxrwxrwx 841 root system 31449 May 09 10:25 /backup myhost:hkgdb:/wd/user1>ls -ld /backup/myhost drwxr-xr-x 2 user1 dba 3221 Jan 06 2019 /backup/myhost My operating system details are below: myhost:hkgdb:/backup/myhost>uname -a AIX myhost 1 7 000D1F9BD400 Below are the details of the backup drive. df -gt | grep backup 10.9.90.107:/ifs/data/NAS_BKP 396149.93 384419.14 11730.80 98% /backup Can you please suggest what could be the issue and how can I resolve it ?