RAID systems data recovery
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In Our Laboratory We:
- Recover RAID systems of all levels!
- Recover RAID systems produced on the controllers of all brands: (Adaptec, Promise, LSI, Mylex, HighPoint, SUN, Infotrend, EMC), on the disks with the following interfaces: SCSI, SATA, IDE, SAS.
- Recover RAID systems working with any operating(Windows, Linux, Unix, FreeBSD, Novell, Mac OS) and file (NTFS, FAT, HFS, HFS+, Ext2, Ext3, UFS, UFS2, ReiserFS) systems.
Data loss avoidance! Before the RAID systems recovery procedure We always do sector by sector data copying of the all RAID disks. At the same time we test RAID disks to find out damaged sectors.
- Raid system hard drives (it is obligatory);
- Raid system controller (if it is a separate board);
- The whole Server (if RAID system controller is integrated in motherboard).
The Users should know the following: the more expensive and fail-safe RAID system is, the more amount of disks it includes and the more complicated and expensive is the RAID system data recovery if it is damaged.
It is important! To carry out RAID system recovery in Our laboratory before server parsing and disconnecting the disks from the controller, You should sign with a special marker all the RAID system disks, their places in the basket (for SCSI disks) and all the daisy chains (for IDE and SATA disks).
Some information about RAID systems
RAID (Redundant Array of Independent Disks) is used to improve data storage safety and/ or to improve the speed of reading/saving information.
There are four most widespread levels of RAID systems:
1) RAID 0(Stripe) has no redundancy and the information is distributed among all the included disks in the form of small blocks (stripes). It raises productivity, but at the same time it reduces the safety for in case of one disk damage at least all the RAID system stops working. It is the best quality-price ratio RAID type since You get 100% of disk capacity. RAID 0 usually consists of two or four disks. These RAID systems are served for fast data processing but not for data storage.
2) RAID 1 (Mirror) has 100 % of redundancy and that is why it is the most safe and easy for recovery works data array. Due to small number of disks it is often used in home computers. It provides acceptable speed of recording rate and a gain in data reading speed due to request paralleling. The only lack of this RAID system is price/capacity ratio as for the price of two Winchesters the user gets only one disk capacity.
3) RAID 10 (or 0+1) - is two RAID systems of 0 level integrated together in one Raid 1 mirror system, i. e. We get accelerated speed of RAID 0 and accelerated safety of RAID 1. The only lack as in the case of RAID 1 is poor price-capacity ratio since the number of disks is only four but the whole volume of disk space is the same as the volume of two HDDs.
4) RAID 5 - is fail-safe array of independent disks with distributed parity blocks. It is the most popular array used in inexpensive server-based system. Here, the only one disk of the array provides redundancy, but at the same time We get protection against any of arrays` disk damage which are incorporated in RAID 5. Such RAID may contain three disks at least. It has the best price/capacity/speed/safety ratio.
There are also many other RAID system types, but they are rarely met comparing to the four RAID systems given.
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