Hello Akabeko,  Hope below link from Microsoft will clear your doubts.  [URL] [URL]
Please let question.  For domain participating user, "Write public information" is necessary when I add isilon to domain. By authorizing user, for what attribute information of AD and what kind of information does Isilon write? While administrator originally has authority.  administrative user could not complate AD participation unless giving "Write Public information" . It seems like writing something in items below. I would like to know specific information it writes. ・description ・distinguishedName (Obj-Dist-Nmae) ・Object-Category ・servicePrincipalName  Thank you for your answer.  
For "Write public information" authority