RAID Data Recovery Services

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Data Recovery Clinic has more Experience Dealing with RAID / SAN / NAS than any other Company Period.

 

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RAID Data Recovery is not like hard drive recovery. It is more complicated due to parity, drive order, rebuilds, drive synchronization and much more. If this is MISSION CRITICAL DATA, Please call 212-537-0444 (24 hour hotline) to speak with us and over

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DRC sector clones all drives prior to doing any work on RAID systems. This is vital to prevent further data loss. DRC has the capabilities to recover RAID systems virtually when possible. Don't be fooled by companies that only want the drives and don't ask more questions. Call us to find out what those questions are. With the constant upgrades and revisions to the firmware changes in controllers and more that is a reckless approach to RAID data recovery. Many times the extra effort can be the difference of recovering your data and not. DRC is committed to not only recover your data, but ascertain WHAT happened to prevent further data loss in the future. Speak with one of our engineers before sending your drives anywhere. 212-537-0444

What Is a RAID?

Which Level of RAID is Best

 

RAID Data Recovery Clinic is unmatched when it comes to RAID Data Recovery and Repair capable of recovering and repairing inaccessible data from all forms of RAID system servers including:
•File Servers
•Application Servers
•Web Servers
•Network Attached Storage
•RAID Systems of Any Size

All RAID recovery work is done on-site in our own class 100 clean room. Regardless of the problem, manufacturer, or operating system, we handle it all:

Problems
•Drive Failures
•Corrupted RAID
•Missing Partitions
•Controller Failure
•Computer virus and worm damage
•Bad Parity
•Drives Out of Order

Manufacturers:
•Adapted
•AMI
•Bus Logic
•Compaq
•HP
•Mylex
•PERC
•Pinnacle
•Promise
•Raidtec
•Software RAIDS
•Storage Dimensions
•Sun
•3ware

Operating Systems:
•Windows NT/7
•Windows XP
•Windows 2000 -2008
•Microsoft Exchange
•Sun Solaris
•IBM AIX HP UX
•LINUX
•UNIX

Call 347-893-3354 to speak with a representative and receive your quote over the phone. We answer our phones 24 hours a day 7 days a week.

What is RAID?

RAID is an acronym for Redundant Array of Inexpensive (or Independent) Disks. A RAID array is a collection of drives which collectively act as a single storage system, which can tolerate the failure of a drive without losing data, and which can operate independently of each other.

What are the different RAID levels?

A research group at UC-Berkeley coined the term "RAID", defining six RAID levels. Each level is a different way to spread data across multiple drives--a compromise between cost and speed. Understanding these levels is important, because each level is optimized for a different use.

RAID Level 0 is not redundant, hence does not truly fit the "RAID" acronym. In Level 0, data is split across drives, resulting in higher data throughput. Since no redundant information is stored, performance is very good, but the failure of any disk in the array results in all data loss. This level is commonly referred to as striping.

RAID Level 1 is commonly referred to as mirroring with 2 hard drives. It provides redundancy by duplicating all data from one drive on another drive. The performance of a Level 1 array is slightly better than a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required. However, since one drive is used to store a duplicate of the data, the cost per megabyte is high.

RAID Level 2, which uses Hamming error correction codes, is intended for use with drives which do not have built-in error detection. All SCSI drives support built-in error detection, so this level is of little use when using SCSI drives.

RAID Level 3 stripes data at a byte level across several drives, with parity stored on one drive. It is otherwise similar to level 4. Byte-level striping requires hardware support for efficient use.

RAID Level 4 stripes data at a block level across several drives, with parity stored on one drive. The parity information allows recovery from the failure of any single drive. The performance of a level 4 array is very good for reads (the same as level 0). Writes, however, require that parity data be updated each time. This slows small random writes, in particular, though large writes or sequential writes are fairly fast. Because only one drive in the array stores redundant data, the cost per megabyte of a level 4 array can be fairly low.

RAID Level 5 is commonly referred to as striping with distributed parity. RAID Level 5 is similar to level 4, but distributes parity among the drives. No single disk is devoted to parity. This can speed small writes in multiprocessing systems. Because parity data must be distributed on each drive during reads, the performance for reads tends to be considerably lower than a level 4 array. The cost per megabyte is the same as for level 4.

RAID 0/1 or10 is a dual level array that utilizes multiple RAID1 (mirrored) sets into a single array. Data is striped across all mirrored sets. As a comparison to RAID 5 where lower cost and fault tolerance is important, RAID 0/1 utilizes several drives, in order to provide better performance. Each drive in the array is duplicated (mirrored). This eliminates the overhead and delay of parity. This level array offers high data transfer advantages of striped arrays and increased data accessibility (reads). System performance during a drive rebuild is also better than that of parity based arrays, since data does not need to be regenerated from parity information, but copied from the other mirrored drive.

RAID 0/5 or 50 is a dual level array that utilizes multiple RAID5 sets into a single array. In RAID 0/5 array, a single hard drive failure can occur in each of the RAID5 without any loss of data on the entire array. Keep in mind, as the number of hard drives increase in an array, so too, does the increased possibility of a single hard drive failure. Although there is an increased write performance in RAID 0/5, once a hard drive fails and reconstruction takes place, there is a noticeable decrease in performance, data/program access will be slower, and transfer speeds on the array will be effected.

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Which RAID level should I use?

The right choice depends on the application. The RAID Levels below provide a brief summary and general uses. Keep in mind, Adaptec RAID controllers do not support all RAID Levels. Please check Technical Specifications for your RAID product for RAID Levels that are supported.

RAID Level Uses

Level 0 (striping)
Any application which requires very high speed storage, but does not need redundancy. Photoshop temporary files are a good example.

Level 1 (mirroring)
Applications which require redundancy with fast random writes; entry-level systems where only two drives are available. Small file servers are an example.

Level 0/1 or 10 (mirroring and striping)
Dual level raid, combines multiple mirrored drives (RAID 1) with data striping (RAID 0) into a single array. Provides highest performance with data protection.

Level 5 (distributed parity)
Similar to level 4, but may provide higher performance if most I/O is random and in small chunks. Database servers are an example.

Level 0/5 or 50
Dual level raid, combines multiple RAID 5 sets with data striping (RAID 0). Increased reliability and performance over standard RAID5 that can stand a multiple drive failure; one hard drive per RAID5 set.

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