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Data Recovery for RAID Server

As technlogy progresses by leaps and bounds, cheaper and larger-size hard disks are being produced at lower costs, much like the rest of modern commodity items. More and more users are now storing their ever increasing data, music, photo and video  on their hard disk drives. It is now also common for home user to own RAID based NAS server, once considered a very rare luxury that only could be afforded by few. It is also easy for small business owners to own DAS or SAN RAID storage system due to overall lowering of price.

There are many  common RAID levels such  as  RAID 0, RAID 1 (or commonly known  as mirroring), RAID  1 + 0, RAID 5 and Raid 6. Though Raid level 1, 5 and 6 provides some kind of redundancy, it is never a full-proof solution against data loss. Nonetheless, too many people have the misconception of fault tolerance of RAID server without practising frequent backup. In fact, some even treat the current RAID system as the working system cum ultimate backup. As a result, they are frequently caught in a desperate situation when the RAID systems fail without warning, depsite the built-in redundancy.

As failures of RAID system normally involve lost of huge amount of data stored over many years, such data lost could be traumatic for companies or home users. Often, incorrect rescue techniques out of desperation could worsen  situations and hamper the recovery  effort at a later stage.

Based on past job records, nearly all RAID failures are recoverable if there is  minimum  user attempts after failure. In fact,  all the  unrecoverable cases are due to botched rebuild before the RAID systems are sent in.  In such cases, full recovery is not possible though some data remnants may be still recoverable if they had not been completely overwritten.

It is also good to know the RAID do's and don'ts in case of raid server failure. If the raid system is still running at degraded mode, depending on the amount  and critical level of data, appropriate actions should be  taken to reduce loss of data before considering any data recovery action.
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