Your disk is dropping off-line or is being removed before it is unmounted:
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: Failed to read vcn 0x0 from inode 5: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: Failed to read vcn 0x0 from inode 5: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: Failed to read vcn 0x0 from inode 5: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Jan 24 16:51:27 LunaServer ntfs-3g[13140]: Failed to read vcn 0x0 from inode 5: Input/output error
Jan 24 16:51:27 LunaServer kernel: Buffer I/O error on dev sdf1, logical block 36, async page read
How is it connected?