Error nfs_fbig

The file is too large for this server

The server can't hold a file this size — usually a 4 GB limit on an exFAT/FAT32 volume (USB drives), or a per-file quota.

What this means

NFS status 27, EFBIG. The write would exceed the maximum file size the filesystem allows.

Causes

• FAT32 (4 GB max) or exFAT volumes on USB drives attached to the NAS. Reformat the drive as ext4, btrfs or APFS-on-Mac, or copy to the NAS’s main volume.
• A file-size limit in a user quota or a userspace server’s configuration.
• Very old NFSv2-era servers with 2 GB limits — NFS Files doesn’t support those anyway.