OpenLDAP 2.1 High Availability

Hi All, We are planning to configure High Availability for OpenLDAP 2.1 on Linux CentOS. We are looking at following options and we want to check our understanding about corresponding options and looking for your valuable suggestions. 1. Using Replica Service a. This is not enough because if master machine goes down then LDAP updates will not be possible. 2. Migrating to OpenLDAP2.4 a. Master-Master solution looks promising but in our current project time line it is not possible to migrate. 3. Sharing LDAP file system on NFS a. After going through the thread http://www.openldap.org/lists/openldap-software/200209/msg00256.html it is understood that OpenLDAP does not support GFS or NFS. b. But the thread discussion happened very long back around in 2000 to 2002. ????Is that conclusion applicable to OpenLDAP 2.1???? 4. Hosting LDAP Service on CentOS Cluster Suite a. ????Is it possible to configure "Active-Passive" setup using CentOS Cluster Suite???? 5. H/W based clustering a. We don't know what are the possible solutions in this approach and cost incurred. !!!!Please share your ideas.!!!! 6. NetApp2020 a. We have NetApp 2020 Appliance http://www.b2net.co.uk/netapp/network_appliance_netapp_fas2020.htm with us. ????Does this any way help us???? 7. Other alternatives a. !!!!We need your valuable ideas and suggestions.!!!! Please help me in this regard. Regards, Prasad. ________________________________ The information contained in this communication is confidential, intended solely for the use of the individual or entity to whom it is addressed and may be legally privileged and protected by professional secrecy. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it is prohibited and may be unlawful. Please immediately contact the sender if you have received this message in error. This email does not constitute any commitment from Cordys Holding BV or any of its subsidiaries except when expressly agreed in a written agreement between the intended recipient and Cordys Holding BV or its subsidiaries. Cordys is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt. Cordys does not guarantee that the integrity of this communication has been maintained nor that the communication is free of viruses, interceptions or interference. If you are not the intended recipient of this communication please return the communication to the sender and delete and destroy all copies.