RAID stands for Redundant Array of Independent Disks. Group of hard drives that will form a logical unit & work together to reduce the chance of data loss (depending on type of configuration). But even RAID array are prone to errors and damages due multiple drive failure, Configuration failure or human error or any other reasons. We provide Express and Expert solution for any RAID data recovery and Server data crash.
Data is distributed across the drives in one of several ways called “RAID levels”, depending on the level of redundancy and performance required. Used in Servers or as NAS / SAN Storage devices. Usually RAID Array’s are used for Business Database, Government sectors, File Servers, Database Servers, Storage or backup device. RAID levels including RAID 0,1,5,6,10,0+1,50,60, RAID 1E, RAIDEE, RAID Z,Z2,Z3.. are well understood and we are trusted data recovery solution by successfully recovered data from RAID array for various private and government organisations.
Our Recent Success Story for RAID and Server Data Recovery are in the following blog post’s:Our recent success with RAID 6 damaged array 3 drive failures out of 12 SAS drives
VMware deleted RAID data recovery, Click here to Read
Express RAID Recovery: We have quick support team to handle damaged Server and support for business continuity, The Dedicated Express recovery team can handle the issue by completing analysis in 8 Hours of time with detailed quote and time required for data recovery. The recovery can be handled within 2 Days for logical section, firmware, electronic and physical or mechanical recovery can be completed within 15 working days.
Data Loss Symptoms in RAID Array / NAS, SAN, DAS and Workstations :
- Drives and partitions are not accessible or drive mounting failure.
- Applications fail to run & data is inaccessible or not visible.
- Files & folders have data corruption. (Files & folders appear, but data is corrupted due to loss of configuration or error in disk’s).
- Virus attack with partition loss or data loss. Software corruption,
- Loss of RAID Configuration & Server does not Boot after enrering into BIOS Setup
- RAID Rebuilding failure due to bad hard disk or damaged striping.
- RAID is taking too long to rebuild configuration, indicating bad disk or damaged disk in the array.
- Hard disk failure in component level in PCB / Electronic circuit board, damaged components or media level failure.
- Firmware Failure with hard disk detection with model but capacity is not shown.
- “CRC Errors” / Bad Sectors in Hard Disk or “Unrecoverable Read Errors (URE)” during rebuild.
- “Punctured Sectors” in RAID Array loosing configuration & after hot swap configuration is not built.
- Media Level damage in one or more Hard disk in RAID Array.
- “Drive Offline” “Drive Foreign” Error, multiple drive failures in the Array structure making RAID Inaccessible.
- Physical damage caused due to water, fire, earthquake or heavy electricity.
- Hardware RAID Controller failure due to power outage or fluctuation & rebuilding failure.
- Reconfiguration of RAID Controller by accident or human error either by replacing new drive or new RAID configuration.
- Accidental Partition loss either due to format, delete or mishandling.
- Accidental file or folder loss either due to format, delete or mishandling.
- Hardware corruption due to incompatible devices addition or hardware component conflicts.
Following Precautions needs to be taken during drive crash or RAID array parameter loss to avoid future data loss from the same.
Precautions in RAID after data crash / loss:
- Do not replace any of the drives in array with new hard drive, until sure that remaining drives are healthy.
- Dont remove the drives and insert it into different slots, RAID will be configured with series on numbers starting from 0,1,2.. Misplacing the drives into different slot will lose its original raid array structure.
- Do not import raid configuration on the controller if more than spare capacity of drives are replaced. Ex: not more than 1 drive in RAID 5.
- Dont listen to the server or NAS box vendors while they concentrate on bringing the server back online not on data available inside the same. Most of the cases are damaged during initial stages yielding damaged data during recovery.
- Retain original hard drives in the array, if the reconfiguration fails we can make use of original array and its drives for data recovery, not to replace the drives with vendors.
- Label each hard drive by its series, Ex: 0,1,2,3… as per the original configuration.
- Try not to reset to factory reset in NAS box since the overwritten partition recovery in NAS will yield irregular results in its folder structure.
In all the above cases, RAID data recovery service is required, any DIY activity will damage the RAID array parameters and hence damage the workings files and folders from the drives. We handle the drives with read only parameters ensurin the original drives are intact in the same condition even after data recovery process completion, we provide the best and expert results in industry in RAID data crash.
Types of Standard RAID Array’s Used :
|Raid Array||Array Description||No. of Drives||Fault Tolerance||RAID Recovery|
|RAID 0||Block-level striping without parity or mirroring.||Minimum requires 2 hard disk’s.||Performance: High
Non Fault Tolerance – A Single drive failure in array will result in total data loss. RAID 0 is Low cost & maximum performance.
|Recovery for RAID 0 requires all original hard disk’s used in the same array during data loss.|
|RAID 1||Mirroring without parity or striping.||Minimum requires 2 hard disk’s.||Performance: Average
High Fault Tolerance – Provides high fault tolerance due to copies of same data is mirrored in alternative hard disk. Capacity will be reduced to half. Provides data redundancy, high performance & fault tolerance. Costly.
|Recovery for RAID 1 requires (n-1) (where n is total number of drives), drives of the original hard disk’s used in the array during data loss.|
|RAID 2||Bit-level striping with dedicated Hamming-code parity||Minimum requires 3 hard drives.||Less used Array structure. Can recover from 1 Drive failure.||Recovery of RAID 2 requires (n-1) drive of original array.|
|RAID 3||Byte-level striping with dedicated parity.||Minimum requires 3 hard drives||Rarely used array, Can Tolerate from 1 drive failure. Suitable for higher transfer rates.||Recovery of RAID 3 require (n-1) drive of original array.|
|RAID 4||Block-level striping with dedicated parity.||Minimum requires 3 hard drives||Fault Tolerance with 1 disk failure. Used in NetApp enterprise level company. Normally is replaced with RAID 5 structure.||Recovery of RAID 4 require (n-1) drive of original array.|
|RAID 5||Block-level striping with distributed parity||Minimum requires 3 hard drives||Performance: Average
Fault Tolerance with 1 disk failure. Very Popular due to Low Cost of redundancy,
|Recovery of RAID 5 require (n-1) drive of original array.|
|RAID 6||Block-level striping with double distributed parity. It extends RAID 5 by adding additional parity block.||Minimum requires 4 hard drives||Performance: Average
Fault Tolerance with 2 simultaneous disk failure. Read operation is good but performance is penalized for write operation.
|Recovery of RAID 6 require (n-2) drive of original array.|
|RAID 10||Mirroring without parity, and block-level striping||Minimum requires 4 hard drives. (Mirror + Strip) or (Strip + Mirror)||Performance: Very High
Redundancy: Very High
Fault Tolerance with 1 disk failure per span.
|Recovery of RAID 10 require (n-1) drive of original array per individual span.|
|RAID 0-1||Mirroring with RAID 1 & Striping with RAID 0||Minimum 2 Disk for RAID 1 & 2 Disk’s per RAID 0 Array||Performance: Very High
Redundancy: Very High
Efficiency: Very Low
Fault Tolerance with 1 disk failure per RAID 1
|Recovery of RAID 0-1 can be done even with many drive failure with RAID 1 Drives & none in RAID 0 array|
RAID Drive Types Used in Server and Workstation’s :
- IDE/ATA/PATA/EIDE, ULTRA/ATA 100, SATA, eSATA, SCSI(50 pin, 68 pin, 80 pin), iSCSI, SAS, Fibre Channel, PCI & PCIE Channel, Firewire, Nand Flash, SSD RAID Array data recovery.
SCSI 68 / 80 PIN CONNECTOR
PATA 50 PIN CONNECTOR
EXTERNAL SCSI CONNECTORS
SCSI CONNECTORS MALE AND FEMALE CONNECTORS
Storage Units Types we Recover :
- Servers with RAID configuration RAID 0 TO RAID 50, DAS (Direct Attached Storage), NAS (Network Attached Storage), SAN (Storage Area Networks), SAN Over IP.
RAID Server Models Supported :
- IBM x, IBM power, HP ProLiant, HP LeftHand and HP 3PAR Servers, Dell Poweredge Dell PowerVault, Dell EqualLogic, Dell Compellent Servers, SUN, NEC, Compaq, Hitachi, IOmega, Quantum Snap! Server, Maxtor MaxAttach, NSS nStor and HP Storage servers, NET App and EMC Storage devices etc…