Recover partition to restore md0 keeping linear on two disks.

[Mattan 27]

My DNS-323  RAID 1 is degraded as sdb2 is not part of md0 and I want to restore md0 keeping linear that uses both disks. Maybe a power outage result. Have run reboot and check.

RAID

Dev.	Capacity	Level	State	Status	Action	Done	ETA
md0	233.0GB	raid1	clean	degraded	idle
md1	1395.0GB	linear	clean

 

Mounted Filesystems

Dev.	Label	Capacity	Available	FS	Mode	Dirty	Automatic FSCK in
md0		229.3GB	109.6GB	ext2	RW	*	23 mounts or 179 days
md1		1.3TB	69.9GB	ext2	RW	*	29 mounts or 179 days
sda4		486.2MB	486.1MB	ext2	RW	*	30 mounts or 179 days
sdb2		229.3GB	109.6GB	ext2	RW	*	25 mounts or 179 days
sdb4		486.2MB	485.4MB	ext2	RW	*	19 mounts or 179 days

 

RAID Maintenance

Dev.	Capacity	Level	Ver.	Components		Array	RAID Operations	Component Operations
md0	233.0GB	raid1	0.9	sda2

 

md1

1395.0GB

linear

0.9

sda3 sdb3

 

Tried to add sdb2 to md0 without success – info suggested it was already mounted. Run clear and sdb2 disappeared as possible add. – some info about using fun-plug but I am anable to install it as

http://www.inreto.de/dns323/fun-plug/0.5/fun_plug is ” Forbidden” webpage.

Any help appreciated

[Mattan 27]

New info:  Used ssh to use commandline. /dev/sdb2 is mounted  and can be added to smb share with networks in ALT-F - can be browsed and looks fine and " almost" the same as md0.

How do I include sdb2 in md0?

[Mattan 27]

Solved !

Unmounted sdb2, added sdb2 to md0 with

mdadm --manage /dev/md0 --add /dev/sdb2 from replacing_hard_disks_in_a_raid1_array
remounted md1 and updated fstab.
Worked fine after reboot and no error messages :)

On Monday, December 3, 2018 at 10:11:16 PM UTC+1, Mattan 27 wrote:

[João Cardoso]

On Tuesday, 4 December 2018 13:12:09 UTC, Mattan 27 wrote:

Solved !

Unmounted sdb2, added sdb2 to md0 with

mdadm --manage /dev/md0 --add /dev/sdb2 from replacing_hard_disks_in_a_raid1_array
remounted md1 and updated fstab.
Worked fine after reboot and no error messages :)

Glad to hear. After all using the command line is not that difficult, as long as we know what we are doing, of course.

You could do everything from the webUI, as the wiki explains. Notice the following:

But If the RAID was created under D-Link firmware, the disk partition for RAID usage is a generic linux type,

and in order for it to appear in the webUI in next F step it needs to be changed to be of type RAID.

Use either set of instruction bellow, depending on the Alt-F version you are using.(...)