Re: Session and Multi Server Architecture

mike wrote: >> Check out persistency in LVS for instance: >> http://www.linuxvirtualserver.org/docs/persistence.html > > i know persistence handling is an option in LVS, but i haven't seen > the need to use it. i use LVS right now without even bothering with > any of that. Because you've chosen another option - memcached presumably - which is more expensive over all. (IMHO). > besides, if you are sticking a user on the same server, what happens > when that server dies? On the next request, LVS will know not to try that server, and the user will move to another one. Obviously the session-context will die, but is that really a big deal? How often does one of your servers die? Sure, if you've got 10,000 in a cluster, you'll have fans and harddisks pop every so often, but I have my doubts about memcached scaling to that level (please correct me if I'm wrong here, I have _no_ experience with memcached). > possible connection stampedes to others, their > session info and experience is trashed (unless LVS migrates it fast > enough) LVS won't migrate any of your data for you. It'll shift the client to an available server, that's all. /Per Jessen, Zürich