I asked to create an HLD and LLD for one of our customers which have
2x Exchange servers with more than 20000 mailboxes
and as per book, each enterprise vault server should only handle 5000 users max
and only 1x archiving task per exchange server.
how to do it ?
It also depends on how the mailboxes are used. Are they all user mailboxes, which do 'average' use of mailbox? Are there many mailboxes which get only a few mails a day/send a few a day? Depending on the mailbox load, you might be able to archive those 2 Exchange servers with two EV servers, but it is tight. If possible, add an Exchange server (or two).