Ejabberd recover after network crash

Hi!

I have three ejabberd nodes in my cluster, and all of nodes have their own disc_copies of all tables. After network crash, mnesia disconnected from each other nodes and all nodes was running separately... Now, how can i recover from this situation, i've shut down the two other nodes and after some time start again, but sessions were not synced. I mean, all of sessions newly connected users, are syncing good, but old sessions are not synced. How can i recover it?