mdb_put failed: MDB_MAP_FULL

I've temporarily fixed my Kerberos problem (I think) by using k5start to start slapd in debug mode:

k5start -f /etc/krb5.keytab host/voltron-b.pppl.gov -- /usr/sbin/slapd -d 1634

When I do this, I no longer see the SASL auth failures, but now I'm seeing this error.  Does this mean there are too many members in the group "trbatch"?

mdb_id2entry_put: mdb_put failed: MDB_MAP_FULL: Environment mapsize limit reached(-30792) "cn=trbatch,ou=groups,dc=unix,dc=pppl,dc=gov" 5e27700b null_callback : error code 0x50 5e27700b syncrepl_entry: rid=001 be_modify failed (80) sasl_generic_write: want=71, written=71