OpenSolaris – How to Remove ZFS Dump Device

1. Offline drive #1.
2. Replace the old drive with the newer, high-capacity drive.
3. zpool replace the drive.
4. Wait for the replacement to be rebuilt.
5. Goto step 1 and repeat for each successive drive in the array.

You may need to export and then import the zpool once this procedure is complete; the pool will then show the increased size. No downtime is required, but if a drive does go south while you're upgrading your array, you will lose everything, as with four total disks you presumably have a 3+1 setup. (The odds aren't that high, but Murphy never sleeps.)

The official source: "Replacing Devices in a Storage Pool" in the ZFS Administration Guide. The ZFS Best Practices Guide is also useful.

From my understanding, it's only available at this point in time in SXCE. Theoretically, you could take what's needed from SXCE and bring it over to OpenSolaris, as they are basically the same core system. I have not done this myself, so I have no idea what's actually envolved. A good starting point would be to examine the pkg on SXCE if there is one to see what's actually installed.

Also, see here: http://www.opensolaris.org/jive/thread.jspa?threadID=86966. Apparently it works, but not well. Should get you started.