If you have LLT working over the ce driver on Solaris, one small change that you can make to help performance problems in your cluster would be the following:
The /etc/system file on all hosts should have:
set ce:ce_no_tx_lb=1
set ce:ce_taskq_disable=1
set ce:ce_reclaim_pending=1
A reboot is required.
Please read this tech note for details:
http://seer.entsupport.symantec.com/docs/292684.htm
