All nodes I user zSwap (or Swap in zRam) I do have also some swap space in disk with lower priority which when/if gets used means something warning. Overall the usage of zSwap helps a lot to increase the density of a Host at the cost of CPU which in most cases is more idle than memory or storage Fernando On 30/12/2016 21:47, Pavel Gashev wrote:
I enable zSwap on my oVirt nodes by default. However zSwap is not the same thing as zRam. The purpose of zSwap is decreasing I/O by compressing swap itself. zSwap uses some ram for compressed swap, but it doesn’t try to keep a page in memory if it can’t be compressed.
I find using of zRam without swap too risky. You don’t know when OOM killer start its job.
-----Original Message----- From: <users-bounces@ovirt.org> on behalf of Fernando Frediani <fernando.frediani@upx.com.br> Date: Friday 30 December 2016 at 20:06 To: "users@ovirt.org" <users@ovirt.org> Subject: [ovirt-users] Using zRam with oVirt Nodes
Hello folks.
On simple libvirt/KVM hosts in order to improve RAM usage and avoid swap to disk I use zRam with swap to RAM technique. So create half of amount of host memory in zRam disk divided by the number of CPU cores. Works pretty well.
Has anyone tried it with oVirt Nodes or even has it been considered as a feature to simply turn on/off ?
Thanks Fernando
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