Error nfs_rofs

The share is read-only

The export is shared read-only, or the volume under it went read-only after an error.

What this means

NFS status 30, EROFS. Writes are refused because the filesystem — as seen by this client — is read-only.

Two possibilities

1. The export rule is read-only.

• Synology: NFS rule → Privilege: Read/Write.
• QNAP: NFS host access → Access right: read/write.
• TrueNAS: share → untick Read Only.
• Unraid: NFS Security Settings → Security rule with rw.
• Linux: rw instead of ro in /etc/exports, then sudo exportfs -ra.

2. The volume itself is read-only. Synology puts a volume into read-only mode after a filesystem error (Storage Manager shows a warning); Linux remounts a volume read-only on disk errors (dmesg shows it). Fix the storage; the export rule is fine.