slow or inconsistent syncrepl

["Amol Kulkarni" <amolkulkarni@gmx.com>]

I have a following openldap setup with syncrepl :
 
- openldap version 2.4.23 
 
- 1 provider and about 10 consumers in lan and 50 consumers on wan
 
- The replication type is push - refreshAndPersist.
 
- There are about 0.5 million nodes
 
- The physical size of ldap folder is about 5gb.
 
- All the lan servers have identical hardware configuration.
 
 
I have following problems/questions.
 
 
1. We observe that LDAP replication works better on one server as opposed to another in same LAN and having the same configuration ? Is ldap replication affected by the ldap read operations on the consumers? So if 2 consumers are getting different amount of ldap reads, will replication speed be different?
 
 
2. On a really busy ldap server, can replication slow down drastically?
 
 
3. We find that even though the contextcsn of provider & consumer is same - actually there are nodes which are different and there are nodes which are not added or deleted. So we have created a custom script which compares entrycsn's of each and every node. Is this ok ?
 
 
4. We are currently having about 60 consumers - is this too much ? What can be the max numbers of consumers ?
 
 
5. Sometimes we urgently need some particular node to be present on the consumer - for which we cannot wait - in that case we get ldif of that node from provider and do ldapadd on the consumer ( mirrormode is ON on the consumers ). Is this safe and correct or could it cause some side effects ?
 
 
Kindly help me in troubleshooting these issues.
 
Right now I cant think of what server configuration I could provide so I dint give it in this mail so pls tell me if anyone needs some particular configuration.
 
 
Thanks and Regards,
 
Amol Kulkarni.