Cyrus 2.5, xapian, Sphinx and index sizes

Sebastian Hagedorn Hagedorn at
Tue Sep 23 04:58:53 EDT 2014


as I mentioned a few days ago, we're considering metapartions on SSD drives 
in order to optimize IMAP search performance. We have yet to run a full 
analysis on how much storage that would require, but a first guesstimate 
points towards about 20% of the net mail data for all the cyrus.* files 
when using SQUAT.

Bron mentioned support for xapian in 2.5, so I took a look at the branch 
and noticed that there isn't only support for xapian, but actually a choice 
of SQUAT, xapian and Sphinx. Eventually I'd like to learn the pros and cons 
of the various choices, but right now I have mainly one concern:

Will index files be larger with xapian or Sphinx? Will they also be stored 
on the metapartions? My concern is that we might run out of space on those 
metapartitions if we choose a different indexer ... what's the operational 
experience regarding that at Fastmail?

    .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
   .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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