Just an idea ... try tunning pdflush parameters ( ... must be root) :
echo 200 > /proc/sys/vm/dirty_writeback_centisecs echo 400 > /proc/sys/vm/dirty_expire_centisecs
If it works, make the changes permanent by editing /etc/sysctl.conf
Just an idea ... try tunning pdflush parameters ( ... must be root) :
echo 200 > /proc/sys/ vm/dirty_ writeback_ centisecs vm/dirty_ expire_ centisecs
echo 400 > /proc/sys/
If it works, make the changes permanent by editing /etc/sysctl.conf