Common Raid failure causes:

* Adding incompatible hard drives to the RAID array
* Hardware conflicts with the hard drive and server
* Software corruption to the operating system
* A virus infection, software and operating system upgrades
* RAID controller failure or configuration changed
* Two or more hard drives fail or go offline
* Server crashes and won’t remount the array or volume(s)
* Configuration becomes corrupt or damaged

RAID controller failure Symptoms:

1. Write process stops
2. You get errors, such as: “Array controller failure
[command failure (cmd= <cmd_no>, err=<err_no>)]”

3. Disk couldn’t be read with errors like: “Read ahead buffers timeout”
You cannot access your logical units and data anymore. However, if array is using more than one disk array controllers, the logical units are automatically moved to the healthy controller. Thus, no data loss occurs. But in else situations, data needs to be restored by replacing the damaged disk array controller.

RAID FAILURE Types and SYMPTOMS

* Malfunctioned Controller
* Raid rebuild error or volume reconstruction problem
* Missing RAID partition
* Multiple disk failure in off-line state resulting in loss of RAID volume
* Wrong replacement of good disk element belonging to a working raid volume
* Power Surge
* Data Deletion or reformat
* Virus Attack
* Loss of RAID configuration settings or system registry
* Inadvertent reconfiguration of RAID volume
* Loss of RAID disk access after system or application upgrade

* RAID device not ready.
* Incomplete/Partial Array Rebuilds.
* Inaccessible boot device.
* Unable to access drive “X”.
* Device not ready, reading drive “X”.
* Single and Multiple Raid Drive Failure.
* Primary hard disk failure.
* Operating system not found / missing operating system.
* The RAID BIOS recognizes the drive but with garbage parameters.
* The RAID BIOS recognizes the drive but the data is inaccessible.
* Multiple drive or component failure.
* The drive reports bad sectors.
* Corrupt data.
* NTLDR is missing.
* RAID device won’t boot.
* Media surface damage.
* Grinding or clacking noises, normally associated with electro-mechanical failure.
* The drive no longer recognized by the BIOS after rebooting, despite the platters spinning.

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