Forum Discussion

BaltoStar_12467's avatar
BaltoStar_12467
Aug 02, 2013

sample irule for redirect / rewrite

BIG-IP VE (Virtual Edition) v10.2.4 ( build 577.0 )   Could someone please provide or point me to an irule that performs redirects / rewrites , including the match class and associated data-file. ...
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Kevin_Stewart's avatar
Kevin_Stewart
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Aug 03, 2013
The limitation is in fact resource-based, and up to v11.4 (v10 - v11.3) the practical limit is about 100k records in an external data group. I'd need to check, but I believe 11.4 introduces support for millions of records in a data group. If you need to support more than 100k records now, you could conceivably load all of the data into the session table using a "services VIP".

 

 

 

But what is the performance impact of storing data in a file ? I assume f5 must load the data into memory and store it as a hash ( or performance would be hopeless ) but when does this happen ? On f5 startup ( at the time bigip.conf is loaded ) ? Or does the load occur the first time an iRule needs to match against the associated class/data-group ?

 

 

 

The answer to this is "on update", and that there is no appreciable difference in performance between an internal and external data group, both hashed and consumed into memory when loaded.