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Raid 5 Data Recovery and Accessories
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Data Recovery Companies that can recover your data quickly and
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There are a wide variety of choices and manufactures to choose from.
The Data Recovery Companies will keep your hard drives running all day.
Data recovery
from an intact array:
The damage to the logical cylinders structures on an intact RAID
array can result in la loss of data. This can be treated as logical
damage on a single disk. Even the simplest undelete software can
recover deleted files as long as an array is intact. The file
recovery can be attempted using conventional undelete software. Many
software vendors advertise their software to be RAID 5 capable if
they can perform data recovery under such conditions.
These are RAID levels that a hard drive array can have:
RAID 0 – Striped Set
RAID 0 optimizes drive
space and disk I/O but has no data redundancy.
RAID 0
writes alternate blocks of data on each drive using a defined stripe
size. Not only do you get the full use of all disk space but I/O is
spread across all the drives in the array. This makes for faster
reads and writes.
RAID 1 – Mirrored Set.
RAID one is a popular configuration for end users. It allows for
total data redundancy with a minimum of performance degradation. The
theory is that if one of the drives in the array degrades the other
drive takes over totally and the user is notified with either an
alarm from the card and possibly an email.
The problems we at DTI have seen when recovering a mirrored set are
as follows.
1. The problems with Mirrors is they can get corrupted very easily.
Bad data from one drive may propagate itself onto the mirror.
2. If the mirror breaks and try to boot from a single hard drive.
The Operating system will not how to boot from.
3. You must be careful to know which drive rebuild you always want
the drive 0 to be your main drive.
RAID 3 and RAID 4: Minimum of three disks; striped set with
dedicated parity for improved performance with fault tolerance
using a dedicated parity disk.
RAID 5: Minimum of three disks; striped set with dedicated,
distributed parity, which creates an array with fault tolerance
against single drive failure.
RAID 6: Minimum of four disks; striped set with
doubly-distributed parity for fault tolerance against double drive
failure.
Also, various
nested RAID levels combine many of these features within layers. For
example, a
RAID 0+1 system is
a mirrored (RAID 1) array whose segments are striped (RAID 0)
arrays, which has a benefits structure similar to RAID 5.
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