I am running Redhat 5.2 Linux with Postgresql 8.4.4;
When my disk space is 90% free the database performance is very good.
However, when it reaches close to 20% free the database performance is
bad. I know its bad because I see a lot of 'D' next to 'postgresql'
process when running top and I see a lot 'WAITING' in the 'ps' tree. I
was wondering if there are any filesystem tweaks I can do to make
postgresql run smoother. I am currently using ext3. Should I consider
using a different file system for my database?