Working on my COMPTIA A+ Cert. and I came across this topic. While I understand how it works, I don’t understand why you would use it over individual drives?
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> I don’t understand why you would use it over individual drives?
When a drive fails in a computer using individual drives, then it usually takes down either the whole machine (OS is dead) or renders it functionally useless (the data it is supposed to serve/store/process is lost). If you have a backup, you have to spend time restoring it onto a new drive. If you don’t, you also permanently lose data and even more work hours to recreate the settings on the machine.
If you are running RAID1/5/10/etc. (not RAID0), then what happens is that you get a log message/mobile alert/email about a drive failing, you walk up to the still working machine, pop the drive out of the hotswap drawer and put a new one in, then add it into the RAID array in the console. The system will automatically start copying the data from the surviving disk(s) to restore the redundancy. Altogether 0 seconds downtime.
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