Hey, Maybe this would help you. Its a working environment for us. (Web/Application Server/Mail/Database) And its FREE!!!
Linux Environment = Ultamonkey Project Windows Environment = NLB (Network Load Balancing) Its All Free.. except for the windows OS of course :-) Good Luck, Geruel ----- Original Message ----- From: "andrelst" <[EMAIL PROTECTED]> To: "Philippine Linux Users' Group (PLUG) Technical Discussion List" <[email protected]> Sent: Wednesday, April 16, 2008 8:55 PM Subject: Re: [plug] redundant session in cluster > On Wed, Apr 16, 2008 at 4:20 AM, Jagi Sarcilla <[EMAIL PROTECTED]> wrote: >> what we are looking is the application failover solutions. >> without interruption on the application side. >> >> is it right failover or load balance? > > First things first, sorry if almost all are commercial based, that's > my experience.I just don't want to spout information to you just by > googling around. :) > > If you can find a comparable free software like pen,then good. But the > high level stuff discussed is roughly the same. > > That's a good point you are making here. There is a distinction, > though people lump it the same. What you want is load > balancers(resonate for software based or F5 for hardware based), not > necessarily failover(VCS,Service Guard,HACMP or SUN Cluster). > > Seriously, what you want is a tall order and complicated to do. You > can use either one, but complicated for both. > > FYI, if they can spare an SLA within 2-5 minutes of downtime while > failover is happening, the best and easier (but still complex) is > failover/high availability (HA) all the tiers rather than load > balance. Working currently in the financial industry, almost all are > using HA. > >>From the top of my head, the one that i've seen that combines them both is: > > tier1: load balancers (F5 hardware based duallies) > tier2: http/https server farm (apache or IIS or both. No failover. If > it dies, it dies. F5 takes care of not using it.) > tier3: application server (load balancing is done natively on the software.) > tier4: DB server (Using HA.) > > For keen readers, there is still a small downtime when tier 4 does a > failover. If you really want true load balance all the way, be > prepared to cough up some money, like Oracle RAC. If you can cobble > together free software for this and make it work, i'm interested. > > And this handles millions of hits per day. Don't bother tailing the logs. :) > > -- > regards, > Andre | http://www.varon.ca > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > http://lists.linux.org.ph/mailman/listinfo/plug > Searchable Archives: http://archives.free.net.ph > > > > -- > No virus found in this incoming message. > Checked by AVG. > Version: 7.5.519 / Virus Database: 269.23.0/1379 - Release Date: 4/15/2008 > 6:10 PM > -- I am using the free version of SPAMfighter for private users. It has removed 6102 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len
_________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List http://lists.linux.org.ph/mailman/listinfo/plug Searchable Archives: http://archives.free.net.ph
