On 06/05/2014 10:36 PM, Jeff Clay wrote:

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?

change the percentage threshold then.
the idea is if you are swapping - its bad.
though, if you also have a lot of free memory, its kind of absurd to block because there is a swap, but its not needed so it remains swapped.

On Jun 5, 2014 2:34 PM, "Itamar Heim" <iheim@redhat.com

<mailto:iheim@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.











        On Thu, Jun 5, 2014 at 2:07 PM, Itamar Heim <iheim@redhat.com
        <mailto:iheim@redhat.com>

        <mailto:iheim@redhat.com <mailto:iheim@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@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@usarpaovrthost02 ~]#
                 [root@usarpaovrthost02 ~]#
                 [root@usarpaovrthost02 ~]# swapon -s
                 Filename                                Type
          Size    Used
                 Priority
                 /dev/dm-1                               partition
        129490936
                 12811000        -1
                 [root@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...)