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f5gtm_45183's avatar
f5gtm_45183
Icon for Nimbostratus rankNimbostratus
Jan 23, 2012

Graceful failover

Hi all,     I've found a couple of similar questions to mine however they're either too confusing or the answers do not fit my requirement so please accept my apologies if this seems like it's a...
config
design
George_Watkins_'s avatar
George_Watkins_
Historic F5 Account
Jan 23, 2012
Hi f5gtm,

 

 

The default TTL for a WideIP is 30 seconds. If a browser or local DNS cache is holding the record longer than that then it is breaking standard by not honoring the A record's TTL. I would recommend talking to your developers and asking for a 30 minute window to failover the WideIP. You can monitor your LTMs statistics until traffic subsides, then they can proceed with their work. Site-specific session data always presents a challenge. A shared session database is the best way I know of to track shopping carts. I've seen it done site-to-site with an MySQL NDB cluster and it works well. Hope this helps clarify,

 

 

George