[ovirt-users] Memory and swap issue

[Jeff Clay]

I'm concerned about disabling it and having unexpected behavior if the
system actually does end up using all of its swap space. Any insight?
On Jun 5, 2014 2:34 PM, "Itamar Heim" <iheim at redhat.com> wrote:

> On 06/05/2014 10:30 PM, Jeff Clay wrote:
>
>> 126455 MB total, 863 MB used, 125592 MB free
>>   That's what I'm showing right now, but I don't have as many VM's
>> running at the moment. There are currently 8 running and I was getting
>> that issue yesterday when I got around the 15 vm mark.
>>
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>> On Thu, Jun 5, 2014 at 2:07 PM, Itamar Heim <iheim at redhat.com
>> <mailto:iheim at redhat.com>> wrote:
>>
>>     On 06/05/2014 02:24 AM, Jeff Clay wrote:
>>
>>         I'm getting the following error trying to start a VM. I have 64
>>         gb of
>>         RAM on this host. I got this error once before and found that my
>>         swap
>>         partition was only 2gb or so. I increased the swap size to 124GB
>>         and the
>>         problem went away. Below is the error when trying to start a VM
>> and
>>         below that is what my output from "free -g". I don't see why I'm
>>         getting
>>         a swap file error when there's plenty of it available.
>>
>>
>>            * Cannot run VM. Host swap percentage is above the defined
>>         threshold.
>>
>>              - Check your configuration parameters for Host Swap
>> Percentage.
>>            * Cannot run VM. There is no host that satisfies current
>>         scheduling
>>
>>              constraints. See below for details:
>>            * The host USARPAOVRTHOST02 did not satisfy internal filter
>>         Memory.
>>
>>
>>
>>
>>         [root at usarpaovrthost02 ~]# free -g
>>                        total       used       free     shared    buffers
>>              cached
>>         Mem:            62         62          0          0          0
>>                12
>>         -/+ buffers/cache:         50         12
>>         Swap:          123         12        110
>>         [root at usarpaovrthost02 ~]#
>>         [root at usarpaovrthost02 ~]#
>>         [root at usarpaovrthost02 ~]# swapon -s
>>         Filename                                Type            Size
>>  Used
>>         Priority
>>         /dev/dm-1                               partition       129490936
>>         12811000        -1
>>         [root at usarpaovrthost02 ~]#
>>
>>
>>
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>>
>>
>>     what do you see under host general subtab for swap percentage?
>>
>>
>>
> iirc, you can either disable the swap check via the config
> EnableSwapCheck, or change the threshold via BlockMigrationOnSwapUsagePerce
> ntage
> (which would be a confusing name if it affects RunVm and not only
> migration...)
>
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