Hot disk replacement does not start syncing on ReadyNas Pro 6 running 4.2.30

[ferg1]

Hot disk replacement does not start syncing on ReadyNas Pro 6 running 4.2.30

I have a RAID 6 volume using 6 x 3TB disks.

One disk was giving lots of SMART errors so I proactively removed the disk and replaced it with a new disk.

I get DISK REMOVED and NEW DISK ADDED, ARRAY WILL BE REBUILT warnings. However, I do not get any sign of a resync.

ulrich:/c/home/chris# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active raid6 sda3[0] sdf3[7] sde3[10] sdb3[9] sdc3[8]
7795170816 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/5] [U_UUUU]
md1 : active raid6 sda2[0] sdf2[7] sde2[10] sdb2[9] sdc2[8]
2096896 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/5] [U_UUUU]
md0 : active raid1 sda1[0] sdb1[6] sdc1[8] sdf1[7] sde1[9]
4193268 blocks super 1.2 [6/5] [UUUU_U]
unused devices: <none>
ulrich:/c/home/chris#

I've left it for 3 days and no sign.

I've pulled the drive and added it again. Same warnings, but no sign of a resync.

Unfortunately my warranty expired in August last year so no support!

How do I manually start this process?

Thanks Ferg

[ferg1]

I found a similar post where they added the disk manually. Mine is also out of warranty, and I've messed with mdadm a lot, so what the hell!

https://community.netgear.com/t5/Using-your-ReadyNAS/Ultra-6-Dead-drive-Replaced-but-won-t-Rebuild-2...

They copied the PAT from a working disk, then manually added each partition to the approriate RAID device.

sgdisk /dev/sda -R /dev/sdd
fdisk /dev/sdd
sgdisk -G /dev/sdd
mdadm --manage /dev/md0 --add /dev/sdd1
cat /proc/mdstat
mdadm --manage /dev/md1 --add /dev/sdd2
cat /proc/mdstat
mdadm --manage /dev/md2 --add /dev/sdd3
cat /proc/mdstat