RAID 0, 1, 5 and RAID 1 +0 - what the various RAID levels and what is
the right RAID level for you? We show you which system best protects
your data.
What is RAID? Why is this technique useful? And what do all the numbers
that are constantly linked with the name RAID? We answer these questions
and tell you why it pays to protect your privacy when you deal with RAID.
RAID stands for Redundant Array of Independent Disks (arrangement of
multiple independent hard disk drives). This technique is well suited
for applications with high demands for data storage.
The biggest advantage of RAID is to protect against disk failure. This
should be done according to Google and several privacy experts far more
frequently than it would like to pass on the hard disk manufacturers.
Rapid and large single hard drives are disproportionately expensive.
RAID made it possible to combine many cheap hard drives into a single
large and fast hard disk. In addition, techniques have been incorporated
to compensate for a degree of fault tolerance, and even offer one-loss
protection. For example, the loss of a drive is not that the whole array
and the recorded data can not be used.
A RAID disk is divided into several levels that describe the way how the
hard drives are combined into a single disk. The data are distributed
according to each different RAID levels on the drives. The
RAID-Ebenen/Level are typically referred to by numbers. The three most
common level in the private sector and for small offices are RAID 0,
RAID 1 and RAID 5 We are also alternatives and additions, as imagined
JBOD (Just a Bunch of Disks [Just a bunch of disks]), Microsoft's Drive
Extender RAID like RAID and virtualization technologies like Drobo,
NetGear, Synology and Seagate.
Most RAID modes do not need hard disk drives of equal size, but they are
used only for the capacity of the smallest hard disk drive in the
composite. For example, set a 500 GB and 1 TB hard drive in a RAID
system, both as 500 GB of hard disk drives are treated.
You should be aware also that the RAID technology for data redundancy
only protects against data loss if a drive fails and the disk can be
initially operated on a different drive. RAID provides no protection
against data loss from malware, theft or natural disasters, and is
therefore certainly no substitute for a good backup strategy.
Imagine the number 0 rather than before, but as high-speed racetrack.
Because the goal of this mode is speed. RAID 0 distributes data across
multiple drives, for example, block A goes on drive 1 and drive to
second block B Thus, the read and write speed is increased. This
procedure is also commonly called striping. However, there are other
RAID modes to make the tempo.
However, be warned that RAID 0 offers no protection against drive
failures, because the files are not written multiple times on multiple
drives. If one drive fails, you have to live with the missing puzzle
piece. In such cases, your data is lost, unless you are willing to
invest much money in data recovery.
RAID 1 mirrors your data across two drives by read and write commands
are issued simultaneously in both drives. The drives are egalitarian
partners - should one fail, you can continue working with the drive
intact. Of course you should replace the faulty drive as soon as
possible. RAID 1 is the easiest method to your data from drive failure
to protect. However, this protection will cost you half the total memory
capacity, since for example two 1 TB drives now to be combined and thus
takes only 2 TB 1 TB storage capacity is available.
You may select as many pairs of mirrors, such as allowing your RAID
controller. If your system also supports duplex Reading can use RAID 1
to the reading speed will increase by blocks of data are read
alternately from one disk drive and second
This RAID mode, which offers both speed and mirroring for easy and
semi-professional purposes. This mode is just for home office and small
and medium enterprises suitable. RAID 5 stripes data on different drives
and creates parity data across the network drive. Parity data are small
data units that are mathematically subtracted from the large data
bundles. These range from but, conversely, to reconstruct the large
bursts of data.
RAID 5 requires about one-third of the total disk space for parity
information, and requires at least three hard disk drives. Since RAID 5
reads simultaneously from different drives, it is compared to other
systems very quickly. However, this mode will slow down very quickly
when multiple data queries should take place simultaneously, such as in
a server. Their data are well protected with RAID 5 drive failure, since
the parity data is stored on different drives so each drive can be
restored in case of failure.
JBOD
JBOD (Just a Bunch of Disks) can indeed be counted as a disk array, but
offers no speed advantages or data mirroring. JBOD only brings together
several drives into one disk. First, the first drive completely
described, then the second and so on. While many network drives run on
this process, but we recommend using only if you have no alternative.
This means that you really only need a combined disk, and RAID 0 also
have available. In addition, it must be summarized in modern times with
2 TB of disk capacity per drive, hardly useful in the private sector
more disks into one.
Drive Extender
This RAID option is available on NAS systems with Microsoft Windows Home
Server. RAID can be implemented via hardware controller or software and
operates on the bit, byte and block level. Drive Extender, however, uses
the data level of the operating system.
This is needed for this approach, the CPU and can be particularly at
busy servers lead to noticeable performance degradation. On a NAS system
with no major load on the other hand, the impact is minimal. Actually
demonstrate Windows Home Server NAS systems usually perform well and can
take advantage of the Drive Extender use them very well. They can, PATA
and SATA drives, external USB and FireWire storage systems without
problems combined. You have to adapt or disk drive sizes and can fit
more disks to rebuild the entire array without having to. You can also
expand drives easily, provided that the total capacity does not fall
below the required space.
Drive Extender also provides some privacy, since data is stored on
multiple hard drives. This feature is disabled by default. You can also
choose which data should be reproduced by selecting the appropriate
folder. So you can leave critical data safely stored easily, while
important data will be distributed across multiple drives.
Virtualized RAID
Drobo has gained a reputation by it has facilitated the RAID
configuration process significantly and now allows the user to use the
entire capacity of the drive, if hard drives with different memory sizes
to be used. With Drobo, you can add to your system each drive you want
without having to reconfigure the system itself. It is in fact a self.
RAID is still stuck behind the system, but is more transparent to the
user. Virtualization takes care of the mirroring process and may even
appeal to different RAID levels simultaneously.
Other programs that combine several disks into a single drive, from
manufacturers such as Netgear, Seagate, and meanwhile also like Synology
offer virtualization capabilities for data mirroring. Each of them has a
different name. If this trend continues, it will soon no longer be
necessary to understand the various RAID modes, because all of
virtualized modes are available.
The RAID-level specifications include a few more that are now being used
but little more. For example, RAID 2
RAID 2 stripes data written to the bit level, the smallest unit of
information in the computer, on multiple drives, rather than the block
level. This system also writes Hamming ECC (Error Correcting Code)
information in a recovery disk parity at the byte level. This process
consumes a lot of computing power.
RAID 3 has been displaced for a similar reason of other modes such as 0,
1 and 5. RAID 3 also uses no data blocks, but distributed data
information on the different drives on the byte level (8 bits) and also
stores parity information on an additional drive. RAID 4, but
distributes the data at the block level, but stores all parity
information on an additional drive. If the additional drive failure is
unprotected the whole storage system. That is why the auxiliary drive
should be replaced as quickly as possible and the parity information can
be reconstructed, so that a possible loss of data can still be prevented.
Three other RAID modes are actually very useful, but are rarely used.
RAID 6 and RAID 5 is almost like using distributed parity information
across all drives. RAID 6 is only more of it. RAID 6 does have a second
package and distributes the parity information across all drives. This
of course requires more disk space than RAID 5 However, RAID should be
taken into consideration 6, when a high degree of system fault tolerance
will be achieved.
RAID 10, also commonly referred to as RAID 1 +0, stript the data (RAID
0) across mirrored disk pairs (RAID 1). With this setup you get back
some of the write speed that you have lost through RAID 1. However, you
need at least four drives for RAID 10 because of two drives
simultaneously read and written, and these two are then mirrored yet.
For data security is being sacrificed so as with RAID 1 50% of disk
capacity.
However, there are also RAID 0 +1. As with RAID 10 will increase the
writing speed. And again, you need 4 drives and must spend 50% of
capacity for data mirroring.
Now we would like to conclude by giving some hints on how to find the
right one for your needs RAID.
Hardware RAID: This mode in the BIOS or from one RAID controller to be
activated. Software RAID solutions reduce contrast, the performance of
your system.
RAID 0: If you are a fast hard drive, especially when processing large
data wish.
RAID 1: If you have only two drives, but want your data to effectively
protect against drive failure.
RAID 5: If you have more than two drives and build a complete network
protection and brisk want.
Windows Drive Extender: Does its job very well, but is almost only found
on NAS systems. It affects the performance of the system.
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