Yes, the RAIDing is completely transparent to the OS. You don't even have to reboot the machine if the disks are hot-swappable. Just pull the dead one out, install the new one, and the controller will bring it up to speed. RAID-1 is much faster to rebuild than RAID-5 (just a casual observation; I'm not sure if that's a hard-and-fast rule).
I just wanted to let you all know that I succesfully installed FreeBSD 4.8R with Promise FastTrak TX2 on a RAID1 using two IDE drives. Works like a charm all the way from installation! FreeBSD sees the RAID1 arrays as "ar0" and tells me that the two disks are 'READY' :)
It's so nice to know that it actually works and one can be much more safe now than with software RAID... And the card wasn't even expensive. I just have to say that I had my doubts in the beginning, but luckely they were in vain!
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