Raid-0 crashed

During a render computer stopped responding and restarted. The RAID now refuses to mount.  Disk Utility sees it, won't
respond to requests to mount.

Is it possible to recover RAID-0?

External box connecting via USB.
LVL 17
Tiras25Asked:
Who is Participating?
 
Rob KnightConnect With a Mentor ConsultantCommented:
There is no parity with a RAID 0 array so if one drive fails/becomes corrupted, the array fails.

One of the limitations - you may need to recreate the array and  then restore backups.

You may want to consider.an alternative?
1
 
Tiras25Author Commented:
Thx.  Its two SSD SATA3 1TB each.

User didn't do any backups.

What's the alternative?
0
 
JohnBusiness Consultant (Owner)Commented:
Quote "A drawback to RAID 0 is that it does not have parity. If a drive should fail, there is no redundancy and all data would be lost."

Your only hope now is a data recovery agency. I don't think non-RAID recovery tools would work.
1
Improved Protection from Phishing Attacks

WatchGuard DNSWatch reduces malware infections by detecting and blocking malicious DNS requests, improving your ability to protect employees from phishing attacks. Learn more about our newest service included in Total Security Suite today!

 
dbruntonConnect With a Mentor Commented:
You can try Raid Reconstructor  https://www.runtime.org/raid.htm

If the Free Trial says it can reconstruct then pay the money.
0
 
noxchoConnect With a Mentor Global Support CoordinatorCommented:
Tiras, unfortunately you have no chance with RAID0 configuration. Take it as a good lesson and think about backup solution for the future.
However you can try this free software in hope that it manages to get the data recovered: http://www.freeraidrecovery.com/
0
 
Tiras25Author Commented:
Thanks drunton/noxcho, does it matter if it crashed on mac HFS?
0
 
Dr. KlahnPrincipal Software EngineerCommented:
RAID 0 (and 1, and 2) are sadly misnamed and should have been classified under JBOD instead.  There's nothing "redundant" about RAID until it gets to level 5.
0
 
Tiras25Author Commented:
So nothing I can even try with RAID-0 ?
0
 
dbruntonConnect With a Mentor Commented:
You can try the applications noxcho and I mentioned but you'll need a Windows system and associated hardware.  Whether they will be able to handle a Mac file system or not I don't know.

There's this one  http://www.321soft.com/macdatarecovery.html  but I know nothing about it.  Again free trial is offered but it is for Mac.

More comments.  There are other firms offering software that will repair RAID systems.  Do a Google search with the term raid reconstructor mac and you'll get hits.
0
 
andyalderCommented:
@Dr. Klahn, I don't think you are right calling RAID1 as JBOD. I don't know much about RAID2, never seen it.
1
 
Tiras25Author Commented:
Would it work if I copy both drives into one and  try to recover images that way?
0
 
dbruntonCommented:
No.
0
 
Tiras25Author Commented:
Why not :)
0
 
noxchoGlobal Support CoordinatorCommented:
Thanks drunton/noxcho, does it matter if it crashed on mac HFS?
Nope.
However it depends if it was a software RAID or a hardware RAID.
Why not :)
Because each RAID drive has its own unique ID. You could do as you say if you take images of both drives. You can now slave both drives to a Windows system and run there free RAID tool I've suggested.
1
 
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
We've used RunTime's RAID Constructor with great success. Though, with SSDs, if the info is seemingly lost, then the likelihood of recovery is slim to none.

We've had success with third parties and SSDs though. Keep in mind that they are very expensive. The last one, for a client whose primary laptop's SSD had crashed and had not backed up as was expected, was about $3,500US. Recovery was 100%.
0
 
Rob KnightConsultantCommented:
0
 
Wells AndersonCEOCommented:
If you try to fix the problem yourself with some utility program, it is likely you will make it difficult or impossible for a professional drive recovery company to salvage the files. The best advice is to do absolutely nothing to your external drives.

Obviously, it is very important to recover the files or you wouldn't be asking a lot of questions here. What needs to be addressed is how much money is it worth to recover the files.

I strongly recommend that you talk to at least two drive recovery companies. The calls are free. Some companies will even inspect your drives for free.

I recommend these two companies:
http://myharddrivedied.com/
https://www.gillware.com/

Two drives with RAID 0 are essentially no different from one drive  that is the size of the two drives combined. There is no magic RAID utility that will restore a corrupted file because RAID 0 itself does not make any copies of files, sectors or bytes. It just makes two drives look like one.

There are drive utilities that can be used to attempt to salvage corrupted files from disk drives and SSDs, but in the hands of an amateur they can do much more harm than good. Get some professional advice before you do anything to your drives!

By the way, the first thing a reputable drive recovery company will do is to run a professional drive copy program (one that does not alter the contents of your drives) to make an exact copy of the contents of your drives. And the first thing any computer user should do before putting anything of value on a computer is set up automated backups, both onsite and offsite. If you have just one key to your home and lose it, you'll pay a locksmith $300+ to get you into your home and make you a new key. The cost to make a copy of a backup key at a hardware stoe is $1.50 (more for better locks/keys). Backups cost less than 1/100th the cost of recovery.
0
 
serialbandCommented:
A JBOD is not RAID.  A RAID is not JBOD.  JBOD units can be made into software RAID, but those are historically terrible RAID.

RAID 0 has a specific use, mainly for quicker accsess to larger storage of transient, easily recreated data, and there's really no good reason for most people to use it these days.  I was in an industry that did benefit from RAID 0 long ago, but disk space is much, much cheaper than it used to be and disk drives have much more capacity.  Recreate the RAID and run the render again.

Can you erase the disks in Disk Utitily?  Can you delete the RAID and recreate it?
0
 
Wells AndersonCEOCommented:
@serialband - Read the author's follow-up posts:  "User didn't do any backups." The author also asks "Would it work if I copy both drives into one and  try to recover images that way?" She is trying to recover data from the drives. Erasing disks or deleting RAID won't help with that.
0
 
serialbandCommented:
If you're using RAID 0 for data that needs to be recovered, then you're doing it wrong.  I described the RAID 0 use case.  Very few people benefit from a RAID 0.  It's striped data for faster access speed.  It's not a JBOD.  It's not a concatenation.  If one disk is corrupt, then the data is gone.
0
 
DavidConnect With a Mentor PresidentCommented:
Just because the RAID0 crashed, doesn't mean 99-100% can't be recovered.   BUT, you need a pro.  Why did it crash? Is one drive dead?  A recovery lab can likely get 99.999% of it.

TURN EVERYTHING OFF.  Never in a million years would a pro attempt a RAID0 recovery w/o assessing the nature of the fault using HDD diagnostic hardware.

EVERY SINGLE I/O YOU DO on those drives risks further loss.  
EVERY SECOND THE DRIVES ARE POWERED UP risks further loss.

You are in over your head.  Tell the customer to expect $1000+ and call a LOCAL recovery lab.  Any other action would be professional malpractice.

(Even if one of the drive literally melted, you could still get quite a bit of data back, depending on how the RAID0 is designed.  Blocks could be interleaved, which screws you, or it could be that the disks are concatenated into one larger logical volume .. that means any file where 100% of it is on the surviving disk has a 100% chance of recovery (but you might lose the file name).

Most recovery companies will also give a free estimate, and the problem could very well be broken metadata or drivers, or failed controller or cable.   See what I wrote about professional malpractice ... do not futz with the hardware, walk away and tell them they need a data recovery company.   If I was an attorney and they had data loss, I would very well go after you for making things worse, especially if the internal clock reveals unrecoverable write I/O errors after the time they had unrecoverable read errors that results in failed mount.

Don't make their stupidity result in you doing something stupid and making things worse.
0
 
DavidPresidentCommented:
P.S., yes, depending on make & model of drive, there are internal logs that one can access that has a relative timestamp.  With the right software one could pretty much reconstruct actions that some well-meaning support person did and see if the drive in stress lost some more blocks.
0
 
noxchoGlobal Support CoordinatorCommented:
Well, EE turned to be a championship "Who posts more comments". A pity. Quantity does not necessarily mean quality.
The author asked - "is it possible to recover the RAID0?"
And now she got a looooot of suggestions, some of them duplicated and discussions what is better, JBOD or RAID. Gents, let's come back to the track. RAID0 - is it possible to recover it? Yes. No. That's it.
0
 
dbruntonConnect With a Mentor Commented:
>>  RAID0 - is it possible to recover it?  Yes.  No.  That's it.

This depends on if the disks are OK.  If they are, then in my opinion, it is quite possible.  If they aren't then a partial recovery may still be possible, this depends on the errors on the disks.

Good recovery utils just READ the disks to an image file on a third disk.  And that's what any recovery util is going to have to do, READ the disks.

There's a whole bunch of utils been recommended plus Data Recovery agencies.  

---   ---   ---   ---   ---

Now it is possible that the mechanism in the box that contains the drives is gone.  It would be nice to know the brand and model of this box.
0
 
serialbandConnect With a Mentor Commented:
Well, EE turned to be a championship "Who posts more comments". A pity. Quantity does not necessarily mean quality.
The author asked - "is it possible to recover the RAID0?"
That's because experts can now close questions.

Back to the RAID 0 discussion.  If you are using RAID 0, you are creating it for the purpose of destroying it and recreating it when a disk fails, because the data is transient and part of a process.  If you're doing it with the intent of recovery, then you're doing it wrong.  The original post mentions that it is part of a Render process.
During a render ...
While it may be possible to recover it, the amount of time trying to recover the RAID may exceed the time to redo the Render.  As someone that has worked in that industry, you do not bother recovering a RAID 0, assuming that it was made a RAID 0 for the correct reasons I've stated.  You just redo the RAID.  It's much faster and doesn't waste valuable time needed to complete the next Render task.  Just wipe the disks and redo it.  Then get replacement disks immediately and replace the RAID before the next crash.  Time is money.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.