Explanation/Reference:
EMC recommended setting for Solaris include that the /etc/system file be modified to include the following parameter:
* Set maximum IO size
set maxphys = 0x400000
This also requires increase of the maximum I/O size for the disk driver. The corresponding entry and file for this change are different for different Solaris versions, as follows:
For Solaris 10 (SPARC):
File: /kernel/drv/ssd.conf
Setting: ssd_max_xfer_size=0x400000;
For Solaris 10 (x86):
File: /kernel/drv/sd.conf
Setting: sd_max_xfer_size=0x400000;
Etc.
References: EMC Host Connectivity Guide for Oracle Solaris, page 167
https://www.emc.com/collateral/TechnicalDocument/docu5132.pdf