zfs swap: Too fragmented in solaris

Error

root@test001# zfs create -V 5G newpool/swap1
root@test001# swap -a /dev/zvol/dsk/newpool/swap1
/dev/zvol/dsk/newpool/swap1 : Too fragmented

Solution

root@test001# zfs create -V 5G -b 8k newpool/swap1

root@test001# swap -a /dev/zvol/dsk/newpool/swap1