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It only takes a minute to sign up. I've been wanting to do a raid 1 setup in my home with a pair of sata drives. Someone told me that if the controller fails, you can't just get a new controller because you'll have to reformat the drives. Or is that true only in some implementations? I was originally just looking at an onboard raid controller, or an entry level nas drvice like the intel SSE, but If the hardware controller ever fails, will I be out of luck accessing the data if I can't get the exact same hardware to replace it?

Maybe, maybe not. I could care less about performance, in exchange for guaranteed compatibility. I know it's a religious issue, but that's a no-brainer in my world. Typically yes the config is per controller type. So if you have a failed controller and can't replace it with the equivelant you'll probably be SOL.

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As long as it's the same kind though, I've never seen one which wasn't able to import the config from the drives. This is usually stored on each drive. If you're using RAID-1, then the controller is usually not relevant. I've done it in the past. The only thing you will need to be careful of is which controller you replace it with.

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Some controllers the ones in our Dell blades, for example will only make a RAID-1 array by destroying both disks. If you know the parameters the RAID container used, and it was something simple like RAID 0, 1, 3, or 5, then you can perhaps get lucky if you know someone who can code. I had a CMD raid controller fail, and after a bit of easy sniffing around on the drives, I found that each drive had the RAID set configuration stored in the first few blocks.

Skipping that, and writing a simple program to read from each drive in the correct order including RAID 5's rotated parity I managed to recover all the data. It would depend on how the specific controller implemented the array.RAID offers increased performance, storage capacity, and protects your data, but your data is useless if the controller isn't there to reinterpret it.

A RAID controller controls all the data on your array of hard disk drives, so that they work as a single unit. But what happens in the event of a RAID controller failure? RAID controllers are either hardware-based or software-based; hardware-based controllers are normally PCI cards, while software-based controllers are hosted on the CPU and provide similar functionality, although their performance is often limited.

If all of the drives in the array are in full working order, it is likely to be a failed RAID controller.

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The RAID controller distributes your data. To get your data back, the data parameters need to be calculated, which can often be a very time-consuming job, involving a lot of cryptanalysis. Our RAID data recovery team will perform a free diagnostic test on your failed RAID system, regardless of the level, and provide you with a no-obligation quote to complete the work. Simply phone or email us for a job number and send your data recovery to us. Your hard drive or media will be photographed, catalogued and bar-coded and the data recovery evaluation will start within an hour of receipt.

We aim to complete this process within 24 hours depending on the complexity of work involved. The engineers will provide a no obligation recovery prognosis, with a guaranteed list of recoverable files and an estimated timescale.

You can then decide whether to proceed with the recovery.

what happens if a raid controller fails

Should you choose not to proceed, we will return your media by secure data courier. We will then copy out the data to your preferred choice of output media - either 64Gb memory stick or HDD for purchase or loan. Your data will be dispatched on our secure, next day courier service. Once you have received your data any copies of your data will be permanently and securely erased from our servers after 7 days.

With extensive data recovery research and development capabilities, our success rates are second to none - without compromising on our prices!

This is why over 36, companies and individuals come to us every year. Great care is taken when recovering and handling your data to ensure that its integrity is maintained and that there is a clear audit trail through the entire data recovery process.

Class clean rooms, specialised platter removal jigs and software applications allow us to provide the most comprehensive service in the industry. When the drive died the user was in a panic!RAID systems are a configuration of multiple disk drives that present themselves to an operating system as a single data storage medium.

The technique was invented in the late s and continues to be used extensively today. While RAID arrays are a generally stable and reliable way to manage and access data, like all mechanical devices, they can and do break down from time to time.

When they do, the consequences can be significant, causing you to lose valuable files and information. This problem can be especially damaging if your data hasn't been properly backed up. RAID array users can often be lulled into a false sense of security regarding data loss since RAID systems are more reliable than single disk systems, but unfortunately even the most secure RAID configurations can fail.

If this happens to you, there is a good chance that you can recover your data with the help of a professional data recovery specialist, provided you take the right steps to protect your computer and safeguard your data. Let's take a look at the five most common causes of RAID failure, and find out what you can do to maximize the chance of recovering your data.

Most RAID servers rely on a single controller to direct the array's options.

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Occasionally, the controller can fail, due to power surges or other problems. This can cause booting problems and other difficulties. If a RAID volume is not rebuilt correctly, it can cause problems in accessing data or may even cause a complete system breakdown. The purpose of a RAID system is to allow the server to survive the failure of a single system disk.

However, having a failed disk in the system makes the array much more vulnerable to further disk failures and can result in a complete system breakdown. Continuing to run your system in degraded mode significantly increases the chances that the array will fail, taking your important files data with it. When you experience a RAID array failure, it's important that you take the right steps to protect your data.

The first thing you should do is turn off the array immediately. The more you run an array in degraded mode, the more likely you are to do further damage. It's very important not to attempt any physical repairs of the system yourself.

what happens if a raid controller fails

Repairing a failed disk requires a clean room environment, otherwise the dust in normal atmospheric air can do irreparable damage to the affected disk, and possibly erase your data permanently. Contact a data recovery specialist who has the tools and facilities to properly repair the system in order to retrieve your files. The sooner you do this, the sooner your data can be recovered. The likelihood of recovering your data varies depending on the cause and severity of the problem, but in most cases, data can be recovered from RAID array failures with professional assistance.

what happens if a raid controller fails

If possible, make notes of the events that led to the array failure, including any unusual noises, reductions in processing speed, and any power surges or other physical events that could have damaged the array. Any information you can give your data recovery technician will help improve and expedite the repair process.

IrvineCA Interdata Get Started. Data Recovery My hard drive is not booting up My hard drive is making a clicking noise My hard drive will not spin up My hard drive is not recognized by the computer My files are deleted or inaccessible.

Technology Specialization Customer Service. My hard drive is not booting up.How true is this in the case of the H? Does it allow the RAID configuration to be stored on the HDD as well as the controller itself and therefore allow hot swapping of the controller board in the event of a board failure?

Go to Solution. I just connected to one of my client server, seems some of the Dell Openmanage server version supported raid configuration backup, others not; seeems the newer versions do not. I do not understand why Dell does not support the backup of raid configuration to a file, sure would save grief when a configuration goes south.

In the interim, I assume your raid s were setup by Dell, you should go into the raid bios setup and familiarize yourself with the different setup pages, if you do not understand anything google or ask in the forum for answers. Do not make any changes unless you fully understand the consequences. View solution in original post. As far as raid adapter hardware failures, they are extemely rare but there are other forms of raid failure which are often blamed on hardware failure. For for the most part the data on a raid is rarely unrecoverable using a data recovery service at the worst case, assuming a tech does not attempt uneducated proceedures "try and pray".

Make sure patrol reads is never disabled. Setup your system so email warning of critical raid issues are sent out. Great, that was just the answer I was looking for, do you know where I can find documentation on how to backup my raid configuration and ensure patrol reads is enabled?

Documentation on how to configure e-mail warnings would be great as well. I presume that will be configured from a Windows interface, I haven't got as far as Windows yet I wanted to get the raid configured first. Browse Community. Turn on suggestions.

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Web Dev. NET App Servers. We help IT Professionals succeed at work. WillThomason asked. Medium Priority. Last Modified: Just curious what my long term strategy will be in the event of a failure. Start Free Trial.

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View Solution Only. Top Expert This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. Commented: Chances are yes. Not the solution you were looking for?

Getting a personalized solution is easy. Ask the Experts. There are some reports from users stating that the H works fine on the older x9xx servers, but they are not technically supported. Author Commented: I will accept this as a solution, but one small question in addition. I have 4 SSD's in raid 0 now, and every few months the array is lost because of an error with one of hte SSD's and it says it is a foreign drive.

Synology NAS - What Happens When the RAID Fails

Do you happen to have any advice for when this happens how to repair the array without having to redo it? I am hesitant to use this controller for data for that very reason. One thing to keep in mind with OEM controllers like the PERC is the fact that there are drives that are "certified" for use on those specific controllers - drives that have been tuned to match and work flawlessly with the various settings on the controller.

If you are not using certified drives these will be co-branded by Dellthen you may see a number of issues with the drives not communicating well with the controller, whereby the controller will take it offline. Worse, are Desktop drives vs.Further, it becomes the need of the hour to recover data from RAID arrays.

Consequently, data stored in the redundant array of independent disks becomes unavailable thus resulting in a business loss. However, to the computer system, the Controller presents the physical drives as logical segments so that the physical hard drives function as a logical unit.

These may also be available as fully-programmable miniature devices. Else, use probable Start Sectors.

Data Recovery after a RAID Controller Failure

If the Start sector that you desire is not enlisted, you can add one or more entries up to Finally, recover inaccessible RAID data safely.

Well, the reasons are many. Second, it is capable of recovering data from complex RAID structures. Problem solver and Data recovery specialist. Usually share informative articles on data recovery, database corruption and ways to recover lost data. View More. Your email address will not be published.

Repairing RAID Arrays If Your RAID Controller Fails

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If I have 2 drives in a RAID 1, and the Raid Controller fails, does that mean the websites on the server will have downtime until the controller is replaced? Or does everything still carry on as software raid automatically until the faulty raid card is replaced? How would that work?

Would the software magically bypass the hardware raid, which acts as disk controller? Not only does the OS not see the disks, they are actually physically attached to the hardware raid controller. If the controller fails, then your connection to the disks fail. So no, you go down. Which is why small setups gain a lot from cloud offerings and large setups have multiple servers.

I'm an electronics engineer, so my mental picture of the word "fail" may vary from a software engineers' I mean, how often do you guys put on safety glasses for debugging?

If your RAID controller board has any kind of hardware failure which involves shorted MOSFETs, tantalum capacitors bursting into fireballs, power supply mishaps and the like, many things can happen, like your server's power supply shutting down because it detects a short. In this case everything goes down. If the main chip on your RAID card goes dead suddenly, what happens next depends a lot on how the OS and drivers handle sudden unexpected death of a peripheral.

For example, I had a PC with a dead harddisk. The PC froze for a while as the OS waited for the harddisk to respond. People who write OS and drivers usually do this on working hardware. So the code which handles "extension card CPU just caught fire" has never been debugged. Can't blame'em. Fact of life. There was this time when I designed a USB peripheral. Bottom line, a card inside a PC which gets a hardware failure can have any kind of consquences, from nothing at all to kernel panic or full shutdown.

So there is no way to answer your question. A RAID card failure is similar to a motherboard failure. The only thing that matters is to get your data back. You either setup software raid or hardware. Software can't magically pickup since the software see's two disks in a raid 1 as a single disk. It has no idea of the physical disks behind the card.

what happens if a raid controller fails

It only knows what the raid card presents to the OS. So to answer your question if the raid card fails then ya the server is going down with it. Its very rare for a raid card to fail though.

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If you really require that level of availability then I suggest you look into a Stratus technologies ftServer, You can use most any OS and you don't have to change a thing in your application. I worked on internal storage there almost 10 years ago. We can surprise remove any device literally assert pci reset wheneverdetect the fault and failover to the secondary with zero interruption of service. It achieves this by using lockstep technology.