Inquiries to mount disks in RAID

having recently had some minor concerns about one of my disks (crash of one of the disks for I do not know why), I managed so far to find my data intact, and I prefer to take the lead before the disc not loose and I lose everything forever.

So I have 2 hard drives of 320 GB each mounted in normal mode and I need a little more room, I wanted to take two of each 1TB that I mounted in RAID 1 mode to secure the Maximum backup my data.

Do any of you use RAID 1?
Is it easy to configure?
Is it really as reliable as they say?
Performance level? Is there a loss of speed?
Finally, is it really useful?
What are advantages and disadvantages of this mode?

Thank you all for your info.

In the case of a mirror there is logically a loss of performance because the data is written 2 times instead of a The chipset of the motherboard running the recent raid on a rough but functional (according to a friend using the RAID) It's not difficult to configure especially a mirror For a stripe (3 X 1 to = 2 to) it is strongly recommended to have 2 discs of the same model or even the same series (I tried at a time 2 disks of the same size but different brands, in case of crash there was case sensitive) Otherwise Windows NT you have the solution so dynamic disks RAID software, but less thorough.

agreement, these two discs will be used primarily for storage. I have a 150GB WD Velociraptor for my system and it runs well.

So only storage and a partition that will also receive digital TV recordings but hey, I do not think that because of worries.

I intend to buy 2 disks 1TB at the same time (hence two drives are identical since the same set) then it should work.

If I understand correctly, if a disk crashes, data will be intact on the second?

And in case of a clerical error? the error will be on 2 discs?

and the system remains operational and accessible data with a failed disk that, once changed, will be reconfigured to rebuild redundancy. If the error is due to a disc, it impactera that this disc. But all this does not protect against human error, a file will be destroyed manually on 2 discs.

I use RAID1 and I recommend it to all my friends.

In the case of hard or loose, the data are always accessible (via the 2nd disk) and just replace the hard ****ing and repair the array (command that makes the new hard copy of all the remaining disk info) so that everything is secure again.

Indeed there is a loss of performance in writing (all writing 2x) but it seems that there is a performance gain in reading (you can read from 2 drives at the same time). Personal I have not tested the transfer rate as for everyday use I do not note much difference.

Then you must know that you can do RAID1 in several ways:
- In "hardware" (usually this is called the "fake RAID" since the real RAID controllers are very expensive)
- In "software" (that is when the OS that manages the RAID, the proc more bump and crash your OS is a bit more complicated to retrieve your data)

for beginners or those who do not want to configure or bother, I recommend this: (I think you wanted to 1TB is this?)

2x 1TB (1TB = in RAID1) in USB2

or

2x 1TB (1TB = in RAID1) in ethernet (data accessible by all computers on the network, and also on the Internet if desired)

these "boxes" opens easily (valve on top), and it is very easy to change a disc if it is damaged (the disks are in pre rack that you just learned).

good luck

If this can help bring you what is said Wikipedia.
RAID 1: disk mirroring
RAID 1

RAID 1 is the use of redundant disks n (n \ ge2), each disk containing the cluster at any time exactly the same data, hence the use of "mirroring" .

Capacity:
The total capacity is equal to the smallest element of the cluster. The surplus space from other elements of the cluster will remain unused. It is therefore advisable to use identical elements.

Reliability:
This offers an excellent level of data protection. It accepts a failure of n - 1 elements.

Cost:
Storage costs are high and directly proportional to the number of mirrors used, while the total capacity remains unchanged. The higher the number of mirrors is high, and increasing security, but its cost becomes prohibitive.

The read access of the operating system on the disk are easily accessible at that time. The entries in the cluster are at the same time for all disks, so that any disc is interchangeable at any time.

When the failure of one of the disks, the RAID controller off in a transparent manner for data access, the hard question. Once the failed disk replaced, the RAID controller rebuilds, either automatically or on manual intervention, the mirror. Once sync, RAID regains its original level of redundancy.