On systems using Oracle Solaris Zones, the kernel NFS client can only be tuned from the global zone.
On Solaris, by default the maximum I/O size used for NFS read or write requests is 32K. When Oracle does I/O larger than 32K, the I/O is broken down into smaller requests that are serialized. This may result in poor I/O performance. To increase the maximum I/O size:
As superuser, add to the /etc/system file:
* For Delphix: change the maximum NFS block size to 1M
Run this command:
| mdb -kw