For your convenience, you can find the zpool binary mentioned below to create pools with an "ashift" value of 12 here.
Solarismen on : Modified zpool program for newer Solaris versions
A few months ago I published a modified zpool program to create pools with a higher ASHIFT value, suitable for disks with 4k sectors. I expected the program compiled on s10u8 to be upward compatible. Apparently, it isn't. To compile "zpool" on s10u9, I
http://jgilje.net/div/ncp/zpool
thanks a lot for this solution, I've got a bunch of WD20EARS to put to work, but...
is there someone who can provide a zpool compiled for opensolaris nevada 134 and/or openindiana which is at the 147 build level?
TIA.
Maurilio.