[FS#653] RAID not working on Netgear WNDR4700

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Szabo (kisgezenguz) 

Attached to Project - LEDE Project
Summary - RAID not working on Netgear WNDR4700
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - I have problem to crate RAID array on LEDE 17.01. 
Seems there a generale issue with RAID on LEDE 17.01, 
I already report the same problem for Seageat Goflex Net.
https://bugs.lede-project.org/index.php?do=details&task_id=648&string=raid&search_name=&type%5B0%5D=&sev%5B0%5D=&pri%5B0%5D=&due%5B0%5D=&reported%5B0%5D=&cat%5B0%5D=&status%5B0%5D=open&percent%5B0%5D=&opened=&dev=&closed=&duedatefrom=&duedateto=&changedfrom=&changedto=&openedfrom=&openedto=&closedfrom=&closedto=

 - Device problem occurs on
Netgear WNDR4700

 - Software versions of LEDE release, packages, etc.
root at Netgear:~# uname -a
Linux Netgear 4.4.50 #0 Mon Feb 20 17:13:44 2017 ppc GNU/Linux

root at Netgear:~# mdadm -V
mdadm - v3.2.5 - 18th May 2012

 - Steps to reproduce
   
root at Netgear:~# lsmod | grep raid
md_mod                 97480  2 raid1,raid0
raid0                   6336  0
raid1                  25728  0

root at Netgear:~# mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdd1
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device.  If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
mdadm: /dev/sdd1 appears to be part of a raid array:
    level=raid0 devices=0 ctime=Thu Jan  1 00:00:00 1970
mdadm: partition table exists on /dev/sdd1 but will be lost or
       meaningless after creating array
mdadm: size set to 982464K
Continue creating array? yes
mdadm: unexpected failure opening /dev/md0

 

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=653