Community Question

There are some pretty smart computer techs on this forum so I am looking for a bit of advice on an issue that I am having. This is not EZ-Robot related, but is a location that I can go to for some advice from people who may have some experience in this, so here it goes...

I have a raid 5 that has become corrupt. All of the drives report as good (4 drives in the array). The controller isn't able to correct the array. The device is a Seagate black armor Business Storage 4 Bay NAS. The raid 5 reports as failed.

I think I am going to have to image these drives and recover each drive but have no experience in doing this. If anyone has experience doing something like this or knows of a utility that can help in this recovery, I would greatly appreciate a direction. Before you ask, the person responsible for making sure the backups took place was not doing this part of their job, so no backup is available to restore.

Thanks in advance.

David
jstarne1
Commented January 2015
At Technopro , I have built many machines in 2014 and unfortunately I had horrible luck with hard drives. I picked up several WD blue oem 1tb drives and 2 or 3 drives developed corrected sectors within 2 weeks. I ran smart, reformatted to omitted the sectors and 2 weeks later it happens agian. 2014 was a rough year for WD drives. I agree seagate has always been second to WD but recently the "desktop" and blue series enterprise I have had a 2 of 3 failure but none of the sea gates have failed. Just my experience for 2014. But p
Previously I preffered western digital.
CochranRobotics
Commented January 2015
You have to understand that the tools available are limited to those that will work on an external array connected via iscsi. Also, I didn't buy anything. This is for a school system that has made many very bad decisions and I am trying to help clean up a lot of it.

As for drives, I have built many nas devices and never go with raid 5 for many reasons. I think I dealt with my first raid 5 over 20 years ago when drives were very expensive. Now, raid 5 is a very bad idea. Now raid 10 is the worst that I would setup. Unfortunately, it is the decision that someone else made and I get to clean up.

As for drive brands, I do like wd much better and they are what I use on my nas and have had very good luck with them, but the school bought seagate. Actually for pc's, I have only used Ssd ' s for about the last 5 years. My laptop has raided Ssd ' s in it for the os drive and a third ssd in it for storage, but they just don't store enough for the cost to put into a nas.

Anyway, hopefully the new drive will allow the raid to repair itself. I have a feeling that it is going to take a long time to rebuild. If it doesn't work, we will look at which tools to use to image the drives and which to use to hopefully rebuild the array. I just hope the school figures out that they need backups after this and they let me move them to linux instead of windows soon on their servers.
CochranRobotics
Commented January 2015
The reason the array failed is because the drive that isn't working is being reported as good to the raid, thus it is still trying to use the drive but cant. Replacing the drive should allow the rebuild to start as the other 3 drives have been tested and are good. The raid should recover, and I can copy the data to my raid and then rebuild this array as raid 10 before returning it to them. Long week ahead I believe. There is about 6TB of data to move over a gigabit network and then back. Each move will take many hours to complete without the repair.
Robot Doc
Commented January 2015
@d.cochran, wow, I just installed Ubuntu on a Windows 7 laptop. What a neat environment. Easy GUI install, and so many programs available. Last time I was in a similar environment was at Bell Labs in UNIX land. What a great advancement since then.
CochranRobotics
Commented January 2015
And free. Getting the school to go to it is a challenge. They fear it but they don't understand it so I understand their fear. It could save the school a lot of money and I wouldn't have to worry about them messing around on the server nearly as much.

I would love to have them go with Ubuntu on their workstations but training all of the teachers to use it would be a long process. They fear change, but the environment is so much simpler than windows 8.1. The argument I keep making is that if they are moving to windows 8 they will have to train the teachers on a new environment anyway and ubuntu is free.
Question
AvatarCochranRobotics
Asked on Wednesday, January 14, 2015