It is a common occurrence with an enterprise level RAID server that a hard disk will encounter a problem, requiring the drive to be replaced with a new one, onto which the data and parity information will be rebuilt. Over time hard disks will accumulate bad sectors, which will become apparent when the spare area of drive has been exhausted. This and other failures will cause the hard drive to be flagged by the RAID server as damaged.
It is important to following precise procedures when replacing the failed drive onto which the data should be rebuilt. Should the RAID server encounter another failure while rebuilding the data, it is important not to panic, as your actions at this point are critical, and a wrong decision could cause a loss of data and also add extra complexity to any RAID data recovery undertaken on the server.
Do Not Run in Degraded Mode
Following the failure of a hard drive a RAID array with redundancy is capable of operating in a condition known as degraded mode. It is important however not to allow the server to continue running in degraded for longer than necessary in order to avoid putting your data at risk.
Most RAID servers are built using a set of hard disk drives acquired from the same source and batch, which are then operated in the same environmental conditions continuously. Due to the nature of hard disk failures either due to unreadable bad sectors or a heat related failure, once one drive fails, the likelihood of another failing within the next 24 hours is considerably high. Any delay in rebuilding the data onto a new hard disk drive increases the risk of the rebuild failing, at which point RAID server data recovery is required.
Always Seek Expert Advice
It may be tempting to save money by allowing a staff member to attempt a RAID rebuild, but if that rebuild fails, they should immediately stop without making any further attempts to fix the problem. We have seen many mistakes made, at this point, where further drives have been swapped, without labelling them. We have also seen the consequences of the RAID configuration being changed, which makes data recovery a much more time consuming and complex process.
If the rebuild fails, you should always power the RAID server down and seek professional help from a RAID server data recovery specialist such as DiskEng. Further attempts to bring a failed RAID on-line could potentially cause the lose of some or all of your data, putting the future of your company at risk.
RAID Server Data Recovery
The use of a RAID server would indicate the storage of data which is critical to the operation and future of the company. If this is the case, business continuity is of the utmost importance, so in the event of a RAID rebuild failure you should power the RAID down and contact DiskEng emergency server recovery services, to chat with a data recovery specialist.
The safest course of action following the failure of a RAID rebuild is to trust your data to the RAID server recovery specialists. DiskEng have many years of in-depth knowledge and expertise which they can utilise to recover your data from any RAID configuration, any file system, whatever the storage capacity of the server.