[PVE-User] Disable SWAP on hosts with SSD
t.lamprecht at proxmox.com
Tue Jan 9 10:42:35 CET 2018
On 1/9/18 10:26 AM, Fabrizio Cuseo wrote:
> 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 :
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.
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