Anyone made a mirror w/o destroying what's in the disk already? The
atacontrol man page is less than adequate in this respect...is is even
possible?
Oh, yes-- it's certainly possible to create a mirror with live data,
but one is advised to be cautious and have a full backup available in
case of problems. With hardware-based ATA controllers like Promise,
3ware, etc, they should have a BIOS utility which you can use to
create the mirror-- make sure to add the drive with valid data first,
and then add the second or additional drives to the mirror set.
The same approach ought to work with software-mirroring such as (g)
vinum.
I'd add gmirror(8) to the list of software RAID solutions.
Man page:
http://www.freebsd.org/cgi/man.cgi?query=gmirror&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html
Handbook:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/book.html#GEOM-MIRROR
Cheers,
David
--
David Robillard
UNIX systems administrator & Oracle DBA
CISSP, RHCE & Sun Certified Security Administrator
Montreal: +1 514 966 0122
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