Hi Much is written about High-Availability servers but I still didn't find a good solution how to build two load-balanced webservers _without_ connecting them both to one RAID (single point of failure).
The problem with balancing between two servers is that the might host web-servers that could write a file on system A and then reading this file (status file or whatever) on system B immediately before e.g. rsync could transfer it. In the worst case writing/reading could happen for two different connection so that even connection based balancing wouldn't work. For now I have three ideas: 1. forget about load balancing and do one-way balancing i.e. having one primary and one minutely synced backup. In a case of a failure the backup would take over the service and even if there's a little loss it only occures at failures. 2. use network attached storage. To avoid another single point of failure you then would have to take two file servers and a protocol (NFS wont need) to realize this. Maybe at least IP takeover and forced reconnection NFS clients. 3. Forget about writing anything to disk - apart from FTP uploads everything will have to be written to database. But tell that your customers.. The ideal solution would be a network filesystem like www.inter-mezzo.org but it does not appear to be really mature and tested in real life conditions. So any idea? bye, -christian- -- Christian Hammers WESTEND GmbH - Aachen und Dueren Tel 0241/701333-0 [EMAIL PROTECTED] Internet & Security for Professionals Fax 0241/911879 WESTEND ist CISCO Systems Partner - Premium Certified -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]