Is it possible to create raid 1 from disks partitions?

I don't know if gmirror(raid1) supports partitions but you can boot from gmirror arrays.

Think of it this way; gmirror is used for redundancy.
If one disk craps out another disk has the same information and you can still run FreeBSD.
With one drive gmirror what happens when a drive dies? You lose everything. So the concept is unsound.
If you used gmirror partitions on two disks that would be acceptable.

This is similar to the question; Can I have gstripe(raid0) on partitions.
Disk drives can only read from one section of the disk at a time. They have a gmr head on an arm over the platters.
With raid0 on partitions on a single disk you would have to be reading from two separate areas at one time.
I would suspect that raid0 on single disk partitions would actually be slower than a single drive with no raid0.
 
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