I have a question about what-else Exchange Mailbox storage sizing. I use Exchange 2007 Storage Calculator, and I received 100 FC disk for database LUN, If I use RAID1/10/5 rebuild overhead Percentage = 0. If I use recommended values for RAID rebuild overhead Percentage (35% and 100%), I received 120 FC disk for database. My question is - if I use 100 discs for database LUN, and rebuild overhead take place (for example, IOPS decrease 30% and take 10 hours) , what will happen? If will be just slow response for users, or it queues can dramatically grow and messages can delay for an hours? Thanks in advance.

Probably all of the above depending on the impact.Active Directory, 4th Edition - www.briandesmond.com/ad4/