What happen when a server has a raid1 with 3 disks?

What happen when a server has a raid1 with 3 disks? Does it copy the same info on each drives?
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SAM2009Asked:
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KGNicklCommented:
Disk 2 will mirror Disk 1

Disk 3 will just be another drive.
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driskolltCommented:
RAID1 is a "Mirrored Pair" - Hence there is no such thing as RAID 1 with 3 drives.
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PowerEdgeTechIT ConsultantCommented:
If it has three drives and you're sure it is a RAID 1, then the third drive is either a hot-spare for the RAID 1, a drive configured as a stand-alone drive (single-drive RAID 0, or similar, depending on the controller), or an unconfigured drive.
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waleedaCommented:
it will use only 2 disk and the 3rd one will not been used

better configure RAID 5 for 3 disk to use total size on 2 disks
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SAM2009Author Commented:
Ya maybe I did not check well. Thanks for your helps!
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