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First time Raid 1
- Thread starter TCRS
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benjii
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- Oct 29, 2010
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Raid 1 is a redundancy configuration. As in, one drive mirrors the other so if there's a drive failure you don't lose anything. This means that only one drive will show up. If you were looking to combine them into one large drive, so it looks like a 2TB drive, then you need raid 0. Raid 0 increases read and write speeds by splitting the files over two drives, however, if one fails you lose everything.
If neither of those sound good, then just forgo the raid array and use them as two single drives.
If neither of those sound good, then just forgo the raid array and use them as two single drives.
Thanks Benjii. I wanted to confirm that only one drive (1TB) shows up in disk management, and according to what you're saying that what I'm experiencing seems correct. So, If my master drive were to fail then I swap over to the mirror or does that occur automatically?
There is no "Master". Each of the drives in the array serve as backup to the other. If one should fail, the firmware in the computer will display a message that the array has been compromised by a failure of one of the drives. You'll than replace the defective drive and the firmware will rebuild the array.
Yogi
Let me add a little to YOGI's post. Usually the RAID management software that you used to create the RAID array in the first place will help you if one of the drives fails. But first, yes to your question - the system will continue to function for you by using only the non-failed HDD. You should replace the failed unit and restore the RAID1 array as soon as you can. This is the REAL reason for RAID1. It is NOT an automatic backup!! But in critical applications where you cannot tolerate significant downtime, this will keep you running until you can plan some downtime to make repairs. For example, I use a RAID1 array in a POS computer system to run a retail store sales desk. I don't want it failing in the middle of a day, but I can repair after the store closes at night.
After you have seen the failure message and entered the RAID management screens, usually it will tell you which of the two HDD's has failed. At this point you usually will use its menus to "break" the array into separate HDD's. If it is not clear to you exactly which HDD is faulty, you can disconnect ONE and reboot to see if it still works or not. Then you replace the failed HDD and reboot into the RAID management software again. This time you Rebuild the array, which will copy everything from the good HDD to the new one and re-establish the proper controls and links so you have a fully functional RAID1 array again.
After you have seen the failure message and entered the RAID management screens, usually it will tell you which of the two HDD's has failed. At this point you usually will use its menus to "break" the array into separate HDD's. If it is not clear to you exactly which HDD is faulty, you can disconnect ONE and reboot to see if it still works or not. Then you replace the failed HDD and reboot into the RAID management software again. This time you Rebuild the array, which will copy everything from the good HDD to the new one and re-establish the proper controls and links so you have a fully functional RAID1 array again.
Great explanation. I am writing about RAID and seeking to accuratly describe the word Redundancy. Am I correct that there is a contradiction when we use the word Redundancy in relation to RAID 0 in that RAID 0 is used for performance or for increasing capacity - with no redundancy?
Thanks Colin
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