I tried to buy another drive today (750GB or 1TB) to swap out c3t1d0 (750GB) 
but could not find one quickly.  So I was thinking as a temporary measure to 
use my 1.5TB disk instead as it can be reused at the moment (is currently 
attached to a sil3114 controller - c6d1p0).

Would it be ok to do a zpool replace with this 1.5TB disk attached to the 
sil3114 controller (it's only a SATA1 controller, whereas motherboard ports are 
SATAII):

"zpool replace storage c3t1d0 c6d1p0"

or

should I just physically disconnect the sus 750GB drive (c3t1d0) and plug the 
1.5TB disk to that port and then run:

"zpool replace storage c3t1d0"

What's the best approach ?  And can you confirm the correct steps to take 
please.  If it's the latter option, do I need to do anything with taking the 
pool offline at all, or is it just a matter of shutting the box down, swap 
cables over, start it up and when it comes up degraded (assuming it will), I 
then run the zpool replace command.

I'm feeling a little uneasy about the whole thing, as I have no other backup at 
the moment other then this array being RAIDZ...my 1.5TB disk was to be a 2nd 
copy/backup of most of the RAIDZ data (not the best backup, but at least 
something) but to date I can't read well from the RAIDZ pool to do that 
backup..and it's a few years of home video.  I think I'd just fall to pieces if 
I lost it.

I'd greatly appreciate the advice.
Tim
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