Loading LDIF into a new mirrormode setup

Hi,

I'm trying to optimize loading a huge LDIF file (several Gb) into a 
clean mirrormode setup.

As of now, I don't have hardware with RAM enough to hold the whole 
database, but I've reach useable performance when setting 
olcDbLinearIndex: TRUE and running (on Server1):

# slapdadd -q -w -l database.ldif
and then
# slapindex -q -t

Now, the only thing missing is for Server2 to replicate the entire 
database from Server1.

This is however a bit slow, so I'm wondering if I could do better by 
loading the database on both servers from start, and if there's any 
special things to worry about regarding entryCSN.

Also: The LDIF is from another setup running slapd 2.3.x, so the 
entryCSN values are the old format and the SID values are different.

Should I use -S with slapadd to set the ServerID to 1/2 when loading?

/Peter