We recently switched servers and versions (going from AIX 32 bit v8.2 FP9 to Solaris 64 bit v9.5 FP2a). The new server is a T2000 with 64GB RAM running Solaris 10 - a much stronger machine than before so we were expecting better performance, but we are getting worse. We have another v9.5 FP2a installation in test (also on Solaris 10) that is getting better performance on a weaker server. Production and test are identically configured (except for smaller bufferpools and circular logging in test). The biggest difference we see is the T2000 is using ZFS and test is using UFS.

Has anyone had performance issues with ZFS? Is there special tuning needed for ZFS?