[ovirt-users] Memory and swap issue
Jeff Clay
jeffclay at gmail.com
Thu Jun 5 15:36:28 EDT 2014
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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