On Wed, Sep 10, 2014 at 11:57:05PM +0300, Mohyedeen Nazzal wrote: > Hi All, > I have noticed that there is a huge difference between memory reading > obtained from top or free commands, and values displayed on ovirt engine. > "Host " > > Example: > Engine Version : *ovirt-engine-3.4.3-1.el6.noarch* > *OS: Centos 6.5_x86_64* > > *Used Memory:* > *from free:* > [root@oVirt ~]# free > total used free shared buffers > cached > Mem: 65890412 65609864 280548 0 305408 53759412 > > from Egnine Webpage: > > only 12G is being used. > > Is there an explanation for this ? It's a Linux thing. When a file is opened, it is mapped into memory, but when it is closed Linux does not evict it before memory is released again. Thus, a long-running active host reaches 0 free mem sooner than later. For oVirt GUI, we found this misleading - there, "free" means "how much memory is available for new VMs to use". Therefore oVirt reports "buffred" and "cached" memory as free, too. _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users