Yup, worked fine.  We removed a 500GB disk and replaced it with a 1TB one, 
didn't even need any downtime (although you have to be quick with the 
screwdriver).  I spoke to the x64 line product manager last year and they 
confirmed that Sun plan to support 2TB drives, and probably even 4TB drives as 
they're released.
 
I bought a spare drive bay with the latest x2200 we bought since they look to 
be the same type of mount.  When we do finally buy a Thumper I'm planning to 
have a few spare bays so we can upgrade 4 disks at a time.
 
Now I'm very new to Solaris, so I don't know if this is really the best 
procedure, but this is the best way I found to upgrade the drives on the x4500:
 

Upgrading Drives
Use the procedure for replacing a failed drive with a slight modification.  
When a drive is replaced with a hot spare, ZFS sees that as a temporary change, 
and will revert back to the original drive once it has been replaced.
If you are upgrading, it's more efficient to make the swop permanent.  ie:  
old drive -> new drive
Instead of:
old drive -> spare -> new drive
Overview:

Remove a spare from the ZFS pool 
Use the cfgadm program as documented below to replace the spare with a bigger 
drive 
Replace a drive in the ZFS pool with the new large drive 
Then offline that drive, and repeat 
1. Remove the spare and upgrade it
# zpool remove <poolname> c5t7d0
# cfgadm | grep c5t7d0
sata1/1::dsk/c5t7d0            disk         connected    configured   ok
# cfgadm -c unconfigure sata1/1Now remove and replace the physical disk

2. Start the rolling replacements:
# cfgadm -c configure sata1/1
# zpool replace <poolname> <olddrive> c5t7d0
... wait
# cfgadm | grep <olddrive>
sata1/2::dsk/<olddrive>            disk         connected    configured   ok
# cfgadm -c unconfigure sata1/2Replace that drive and repeat.
 
 
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