There are a number of general system parameters that are recommended to be tuned to best suit Ceph's performance requirements. The following settings can be added to your /etc/sysctl.conf file.
Make sure that the system has sufficient memory free at all times:
vm/min_free_kbytes = 524288
Increase the maximum number of allowed processes:
kernel.pid_max=4194303
Use the following to set the maximum number of file handles:
fs.file-max=26234859