文件系统扩展属性属性格式V1和V2的区别？

通过chfs -a ea改变文件系统扩展属性格式的时候，有V1和V2两个版本，不知道这两种格式有什么区别？

-a ea={v1 | v2}
Specifies the format to be used to store named extended attributes in the JFS2 file system. The v2 format provides support for scalable named extended attributes as well as support for NFS4 ACLs. The v1 format is compatible with prior versions of AIX?. The default format is v1.