3 Mistakes in RAID Recovery That Make You Look Dumb.June 5, 2018
RAID recovery is a process of recovering data from a RAID array which may not be functional because of a number of reasons e.g. controller problem or hard drive failure. Here are 3 mistakes which you can make during RAID recovery to make you look dumb:
Doing RAID recovery when it’s not needed
This is one of the most common mistake that most users make in data recovery. This is very common after a user happens to hear about RAID recovery technique and arrays and he/she thinks that his system has RAID. Having little knowledge about RAID makes most people have a misconception of the recovery process and hence makes a mistake of doing RAID recovery. In most cases, most people can’t differentiate system failure from RAID failure because they have little knowledge of this technology. Therefore, they tend to apply RAID recovery instead of file system recovery procedures which makes them look dumb because they don’t know what they are doing.
Using wrong RAID type
The second mistake in RAID recovery is confusing different types of RAID during recovery. This also happens to skilled technicians who have intense knowledge in RAID recovery. RAIDO and JBOD (Just a Bunch of Disks) are the most confused when doing RAID recovery when a system has failed. However, you should know that a lot of errors might arise when you confuse RAID 5 from RAID 10 during recovery. This is common because RAID recovery software cannot distinguish RAID 5 when one disk is missing in RAID 10.
After confusing the RAID type, you should not get very worried because RAID is read-only and hence your system will operate normally. The only shortcoming of using the wrong array type is getting the wrong RAID configuration in your system because RAID arrays have specific configurations to a certain system. To help you avoid this mistake, you can follow the following tips:
- If you’ve only two disks, they can only be JBOD, RAIDO or RAID 1.
- JBOD cannot be ruled out in RAID recovery if you’ve several disks.
- RAID is never created on a single disk. If you’ve only one disk, it is certainly a non-RAID system.
- If you’ve three disks, they cannot be used for a RAID 6 or RAID 10 recovery process.
- Before initiating a recovery process, check the motherboard manual to know the levels it can support because common motherboards do not support heavy RAID levels.
Using wrong parameters to rebuild a RAID
Rebuilding in recovery is a standard procedure which is usually performed after a failed disk is replaced in RAID 5, RAID 6 or RAID 10. Some people usually tend to force the array online using default parameters or guessing the previous set up after a problem has occurred. In most cases, some controllers tends to start rebuilding if the array is forced online. This may render it impossible to recover your data if you used wrong parameters during rebuild. It gets even worse as rebuilding takes place is a short period of time and even if you cancel the synchronisation process, you will have already lost a lot of data that you will never recover.
To avoid making this mistake and losing your data, you can back up all your array member disks before you start RAID rebuild. Alternatively, you can opt to copy only the important data using a read only software for back up.05