Found 1st Dec 2009
Hi, i have a quick question, I am going to Raid one of my drives (C;/) so i can have a backup of all data incase the drive dies.

My question is when i do this, can i then have another raid 1 for another drive? so basically 2 drives and both being mirrored on another 2 drives

thanks

6 Comments

Kinda of confusing.
So am i right in saying you have 4 hard disks. You want to set up a raid, so therefore you have 2 matching pairs of hard disks. Or maybe they are all the same. Right?

Why don't you set up a Raid 0 for performance and with the other 2 keep the same information on both.
As I don't think if you wanted to backup information a RAID is in your best interests. As if one hard disk goes down then you loose all your information. So in theory you double your chances of loosing your data if one of those hard disks dies.

Actually you could setup a RAID 5 with all four hard disks, if one fails you should still have your data, if two fail, it's lost. That's my understanding.

Kermit2004;7066564

Kinda of confusing.So am i right in saying you have 4 hard disks. You … Kinda of confusing.So am i right in saying you have 4 hard disks. You want to set up a raid, so therefore you have 2 matching pairs of hard disks. Or maybe they are all the same. Right?Why don't you set up a Raid 0 for performance and with the other 2 keep the same information on both. As I don't think if you wanted to backup information a RAID is in your best interests. As if one hard disk goes down then you loose all your information. So in theory you double your chances of loosing your data if one of those hard disks dies.Actually you could setup a RAID 5 with all four hard disks, if one fails you should still have your data, if two fail, it's lost. That's my understanding.




Go with RAID 5 and connect 4 hard disks. Two separate RAID 1's would be overkill unless you need it for a critical system with very high read/write rates.

RAID is not a backup system, it's a redundancy system. The only thing it protects against is disk failure and won't protect against accidentally deleted, corrupted or otherwise lost files like a backup system.

from memory
raid 0 = striping (for performance, workload is spread amongst several disks appearing as one volume)
raid 1= mirrored, work is written to both disks ensuring copy incase of drive failure
raid 5= 2 disks in raid 0 plus one containing checksum data to recreate failed disk 1 or 2
raid 0+1(sometimes called raid 10) this is where drives are striped but also duplicated (incase of drive failure)on spare disks so number of disks need to be 4 plus.
the advantage of raid 1 and 10 is that the array can continue working even if a single drive fails.

Putting truely identical drives in a PC will more than likely result in all failing at the same time.
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