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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...
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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