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Yes, you are right. Zabbix 1.8 postgres database design is ugly, when 
zabbix database do "housekeeping" means scan the fulltable again and 
again,  the SQL query lost response and the tags dev_acive is full.
Compred with FB\LINUX, I can't say DFBSD response  immediately, but it 
can accomplish it in one minutes.  And DFBSD have a feature named 
swapcache can speed up HDD, but I havn't test it.
And I have changed the disk with a SSD yet, but I think FB can do 
somethings better.


Simon