If you encounter error like this on first zone boot:

SunOS Release 5.11 Version oi_148 64-bit                                        
Copyright (c) 1983, 2010, Oracle and/or its affiliates. All rights reserved.    
svc.configd: Fatal error: "boot" backup failed: rename(/etc/svc/repository-boot-tmpHSa4Hq, /etc/svc/repository-boot-20110427_123458): Permission denied         
svc.configd: Fatal error: unable to create "boot" backup of "/etc/svc/repository.db"                                                                            
Loading smf(5) service descriptions: 98/98                                      
svc.configd: Fatal error: "manifest_import" backup failed: rename(/etc/svc/repository-manifest_import-tmpJSa4Hq, /etc/svc/repository-manifest_import-20110427_123527): Permission denied                                                        
svc.configd: Fatal error: Backend copy failed: rename /etc/svc/repository.db-KSa4Hq to /etc/svc/repository.db: Permission denied                                
svc.configd: Fatal error: Backend copy failed: remove /etc/svc/repository.db-KSa4Hq: Permission denied                                                          
Requesting System Maintenance Mode                                              
(See /lib/svc/share/README for more information.)                               
svc:/system/early-manifest-import:default exited with status 95                 
                                                                                
Enter user name for system maintenance (control-d to bypass):

Check your zfs setting, particularly nbmand and atime parameter. I myself set nbmand to off and atime to on for the zones’ zfs filesystem and it booted fine.