Chapter 8. Managing Replication

Table

Description

 

 

 

supplier replica, the replica root, and the

 

maximum Change State Number (CSN) on

 

the supplier. The important thing is to make

 

sure that each supplier LDAP server has its

 

unique replica ID. Multiple replica roots on

 

one LDAP server, however, could share the

 

same replica ID.

 

 

Table Row

Each row represents a direct or indirect

 

consumer of the supplier (identified in the

 

Table Header).

 

 

Max CSN

It is the most recent CSN the consumer has

 

replayed that was originated from the supplier

 

(identified in the Table Header).

 

 

Time Lag

It shows the time difference between the

 

supplier and the consumer's max CSNs for

 

the changes originated from the supplier

 

(identified in the Table Header). A consumer

 

is in sync with its supplier when its time lag is

 

0.

 

 

Last Modify Time

It is roughly the time when the consumer's

 

max CSN was replayed.

 

 

Supplier

This column lists all the suppliers of the

 

consumer.

 

 

Sent/Skipped

Each supplier lists roughly how many

 

changes originated from the supplier

 

(identified in the Table Header) have been

 

replayed or skipped by the consumer. The

 

numbers are kept in suppliers' memory only.

 

They will be cleared if the supplier is

 

restarted.

 

 

Update Status

The number is the status code, and the string

 

is the implication of the status code. Watch

 

this column for possible deadlock if all the

 

suppliers complain that they cannot acquire

 

the busy replica. It is normal if one of the

 

suppliers is doing an update while the others

 

can't acquire the busy replica.

 

 

18. Solving Common Replication Conflicts

Multi-master replication uses a loose consistency replication model. This means that the same entries can be changed on different servers. When replication occurs between the two servers,

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HP UX Red Hat Direry Server Software manual Solving Common Replication Conflicts