I have several T4-4 servers with Solaris 11.1
What kind of settings I need for production environments with OVM live migration?
Should I use OVM manager for rugged environments?
Should I set two io-domain on each server?
Considering that I do live migration, for guess ldom system disk should I configure (publish) one big LUN to all servers or just a separate LUN for each ldom guest.
We have several server T4 and T5, we don't use two io-domain on each server because we have a DRP site in case of hardware problem or big trouble in our primary site.
It could be interesting to have two io-Domain if you have only one T4-4 for your Production application.
Personally we attribute 2 LUN per new Guest LDom ( mirror zpool inside Ldom ) For OS, and other LUN to install DATA,Software..... It's more comfortable if you want move one specific LDom to another Physical Server. Plus, I'm not sure that you can install multiple Guest LDom on one Big LUN.
For the first questions: it's best to have separate LUNs or other backend disks for each guest - otherwise how would you plan to share them across different guests and systems? Separate LUNs also is good for performance by encouraging parallel I/O. Choice of using an additional I/O domain is up to you, but it's very typical for production users because of the resiliency it adds.
For advice on live migration, seehttps://blogs.oracle.com/jsavit/entry/best_practices_live_migration
Other blog posts after that discuss availability and performance.
Hope that helps, Jeff