[ovirt-users] Using zRam with oVirt Nodes

[Pavel Gashev]

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 at ovirt.org> on behalf of Fernando Frediani <fernando.frediani at upx.com.br>
Date: Friday 30 December 2016 at 20:06
To: "users at ovirt.org" <users at 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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