Hi, On 1/9/18 10:26 AM, Fabrizio Cuseo wrote: > Hello. > Can I safely disable swap on hosts with PVE installed on SSD drive ? I think > that 8Gbyte of swap space on 144Gbyte hosts is not so useful and can > accellerate wearout of SSD drives. >
Yes you can. But maybe it's a bit saver to turn the vm.swappiness knob down so that the swap gets only used in real out of memory situations. From the kernel docs [1]: "swappiness This control is used to define how aggressive the kernel will swap memory pages. Higher values will increase aggressiveness, lower values decrease the amount of swap. A value of 0 instructs the kernel not to initiate swap until the amount of free and file-backed pages is less than the high water mark in a zone. The default value is 60." This has the advantage that if your memory is exhausted, by whatever reason, you may still have a functioning system. To temporarily set it live use: # sysctl -w vm.swappiness=0 To make it permanent (surviving reboot) create a file in /etc/sysctl.d/ with ".conf" as ending, e.g.: # cat /etc/sysctl.d/swappiness.conf vm.swappiness = 0 But, if you can be sure that you have enough memory available you can also turn it off entirely. cheers, Thomas [1] https://www.kernel.org/doc/Documentation/sysctl/vm.txt _______________________________________________ pve-user mailing list [email protected] https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
