Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Troubleshooting
Research
Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

THE CUS N4100pro NAS RAID 5 Disappeared

Avatar of Kramer8u
Kramer8u asked on
Disaster RecoveryRAID
1 Comment1 Solution1018 ViewsLast Modified:
I have a N4100pro NAS
The Raid 5 array of 4x1tb drives suddenly disappeared.
2 drives have warnings but when i lok at each drive individually they  operate and have 2 partitions:
1 x 1.x gig at the start of the drive
1x the remaining 900 odd gig...
I have look at  many forums on this and it seems to happen to CUS owners a bit .
I have submitted a conf.bin file from the unit  to the support staff but they haven't responded yet .

One post says that the unit uses logical partitions and linux based software raid :
                                       ----------------------------------------------------------------
"" Re: N4100+ RAID5 disappeared
For anyone who cares there is a way to recover your raid. Same thing happened to me on an older firmware. The thecus uses logical volumes on top of linux software raid. It gets really hairy so I wouldn't do anything and let experts fix raid problems. But basic commands you need to troubleshoot are:

to see status of your actual raid
mdadm --misc --detail /dev/md0
mdadm --misc --detail /dev/md1

pvdisplay will show you the physical volume associated with your logical volume
vgdisplay will show you the volume group associated with your logical volume
if your volume group is damaged you maybe able to recover it with vgcfgrestore.. don't do nothing if this all seems cyrptic and your no good at unix.

lvdisplay will show your actual logical volume group. If anything is wrong you need to identify the problems with the above commands before recovery can happen. ""
                               ---------------------------------------------------------------------
How would I attempt recovery of the 2 TB + files i need ?

As the drives are all operational and only warnings is there a good way to do this saftley ?
what RAID parameters do i need to identify ?

Kramer

ASKER CERTIFIED SOLUTION
Avatar of Kramer8u
Kramer8u

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Commented:
This problem has been solved!
Unlock 1 Answer and 1 Comment.
See Answers