Is it possible to make such a raid?


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The essence of the problem: we need to make sure that the data is maximally protected from loss.


On the computer currently is screw 250Gb. I think to buy 2 screw on terabyte and make them a raid, but the question arises whether it is possible so to do? That is to be used 1 screw on 250, which is not ready and 2 x 1TB in RAID.


and yet, if I'm gonna lose in performance?
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1) the RAID is only 2 hard drive 1 TB.
2)To store information collect RAID 1, it will make a mirror from two screws, the final volume is 1 TB, and if one screw dies of old will be on the second.
3)in this RAID, the idea is you will win in speed, but slightly loses in the record.
4)don't buy raidcontroller, make a software RAID, a good raidcontroller 300 bucks you have not enough money, but the quality is worse than cheap liftovogo RAID.
5)Uminosity the one who wrote that RAID 0 is a mirror. Pruflink ru.wikipedia.org/wiki/RAID
6)When the current capacity of processors on your RAID 1 will take CPU resources quite a bit, for simple mirroring, without checksum(as in 5-th and 6-th RAID).
7)the System is put on the screw 250 and not to store any important data in addition, it will give a small performance boost.
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If You want to do software RAID — it will require resources. But if together with screws else buy a RAID controller (may be already built into the motherboard) — then the performance is not affected.
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1) Software Raid 1 will not slow down and CPU time will take a little and even unnoticed
2) you Need to select your operating system, actually, but in General, you can do Raid 1 for 1 TB of the two terrabyte drives can do RAID 2 500 GB in total to break the discs at the ready as you want, to the point that you do not have to buy two terabaytnye if it is reliable you need to protect only 250 gigabytes.
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3)the System is also put on the RAID will be faster to work + with the failure of one disk does not stop working. In the case of Linux on the RAID should be put in and Swap partition
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The RAID array will be seen as a single drive. So no problem while working hard on the 250 and the array should not be. But performance is a complex issue. Depends on the choice of RAID and on how you distribute the files.
Most likely you want to mirror (RAID 0), that is, you will have a fast 1TB drive and slow 250 gigs. If you leave the operating system on the 250 is not much performance gain will not be. So as you see a better sharing of files — so, all that requires reliability and speed was on the RAID.
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Software RAID level 0 performance is usually higher due to the duplication of information on the disks. So theoretically heavy disk operations will gain in skorosti. Almost — need to check, and the discs all depends. And Yes, it is better to keep the OS also on the RAID.
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RAID does not protect against data loss. Make a backup!
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