10:58 p.m.
On 06/05/2014 10:48 PM, Jeff Clay wrote:
Am I correct in understanding that vm's which aren't being
actively used
are moved to swap space to free more available RAM? If so, that might be
what is causing my issue, since we usually have several VM's idle and
not in direct use.
yes, though i don't they are supposed to be swapped if there is enough
available memory.
On Thu, Jun 5, 2014 at 2:45 PM, Itamar Heim <iheim(a)redhat.com
<mailto:iheim@redhat.com>> wrote:
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(a)redhat.com
<mailto:iheim@redhat.com>
<mailto: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(a)redhat.com <mailto:iheim@redhat.com>
<mailto:iheim@redhat.com <mailto:iheim@redhat.com>>
<mailto: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...)