Have you ever needed a software RAID solution for a low-end server
install? Perhaps you've wanted your workstation to take advantage of
the redundancy provided by a disk mirror without investing in a
hardware RAID controller. Has a prior painful configuration experience
turned you off software RAID altogether on Unix systems?
Since 5.3-Release, FreeBSD comes with gmirror(8), which allows you to
easily configure a software RAID 1 solution. While tutorials on
gmirror exist, I found them to require either manual calculations of
partition sizes with bsdlabel or the use of a fix-it floppy on an
existing system.
It made more sense to me to configure RAID during the install of the
operating system. I also wanted a procedure that was easy to follow
and didn't introduce human error in the form of a math miscalculation.
After cobbling together the available documentation and experimenting
my way through various configurations, I came across a procedure that
has worked well for me on several different systems. I also received
valuable feedback from Pawel Jakub Dawidek, the author of gmirror, who
gave some insight into some of the not yet documented features of
gmirror.
read full article on : http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html
zaher el siddik
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