To decide on which RAIDS to choose from, it depends upon how the server will be utilized including the number of Disks.
RAID 1 - is meant for OS Installations. Min: 2 Disks(OS still runs if 1 disk fails)
RAID 5 - is meant for Applications/Database. Min: 3 Disks(App still runs if 1 disk fails)
RAID 1E - From IBM which is similar to RAID 10, BUT it can be configured with odd number of disks unlike RAID 10.
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