| Recovery Process:
The Recovery process begins with a no charge
evaluation, where every drive in the raid
array is very carefully tested and the ones
which are in working condition will be cloned
to our network. The drives which are damaged
will more thoroughly diagnosed, we will
than determine whether the defected drive
has a physical or logical problem, if diagnosed
as a physical problem it goes into our clean
room.
The Initial FREE Evaluation takes approximately
between 6 - 24 hrs for our engineers to
properly analyze.
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What a RAID (Redundant Array of Independant
Disks) is:
RAID 0:
All the disk devices are organized alternatively
so that blocks are taken equally from all
disks alternatively, in order to reach higher
efficiency. Since the probability of finding
a block of a file is identical for all disks,
there are force to work simultaneously thus
making the performance of the meta disk
almost 10 times that of a single disk.
RAID 1:
In this mode, the goal is to reach the
highest security of the data. Blocks of
data are duplicated in all physical disks
(each block of the virtual disk has a duplicate
in each of the physical disks). This configuration
provides 10 times the reading performance
of a single device, but it degrades writing
operations. Read operations can be organized
to read 10 blocks simultaneously, one from
each device at a time. Similarly when writing
1 block it has to be duplicated 10 times,
one for each physical device. There is no
advantage in this configuration regarding
storage capacity.
RAID 4:
In this mode the ultimate goal is to balance
the advantages of the type RAID0 and RAID1.
Data is organized mixing both methods. The
physical 1 to N-1 are organized in striping
mode (RAID0) and the Nth stores the parity
of the individual bits corresponding to
blocks 1 to N-1. If any of the disks fails,
it is possible to recover by using the parity
information on the Nth hard disk. Efficiency
during read operations is N-1 and during
write operations is 1/2 (because writing
a data block now involves writing also to
the parity disk). In order to restore a
broken hard disk, one only has to re-read
the information and re-write it (it reads
from the parity disk but it writes to the
newly install hard disk).
RAID 5:
This type is similar to RAID 4, except
that now the information of the parity disk
is spread over all the hard disks (no parity
disk exists). It allows to reduce the work
load of the parity disk, that in RAID 4
it had to be accessed for every write operation
(now the disk where parity information for
a track is stored differs for every track)
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