How can I reduce I/O HD requests ?

[nicoschtein]

I am getting a huge load of I/O disk requests, for which i am paying a LOT.. What settings can i play with to reduce the amount of requests? Apart from diff..

[pocesar]

not really settings, but you can implement the use memcached, write to disk in bulk only when necessary, read only from the memory, fetch data from the disk only when necessary, like on blocknotify