Database : Why mongod said "note: noprealloc may hurt performance in many applications"?

lundi 5 janvier 2015

I just start mongod with config file:


mongod -f /etc/mongod.conf

In /etc/mongod.conf, I set storage.preallocDataFiles=true

This is a part of config:


storage:
   dbPath: "/data/db"
   directoryPerDB: true
   indexBuildRetry: true
   preallocDataFiles: true
   nsSize: 16

Why mongod tell me "note: noprealloc may hurt performance in many applications" ?

Database