1:20 a.m.
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Can someone explain the cluster policies to me? The explanation at
http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite clicking for me.
* HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as overloaded. (
Understood )
* MigrationThreshold - defines a buffer before we start migrating VMs from the host (
Not quite grasping. If my High limit is 5 does this mean that it will only begin to move
VMs when the count reaches 10? )
* SPMVMCountGrace - defines how many slots for VMs should be reserved on SPM hosts
(the SPM host should have less load than others, so this variable defines how many VM less
it should have) ( Does this mean that if I have a host with only 3 VMs the SPM will 3 VMs
minus the SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
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<html><body><div style=3D"font-family: times new roman, new york,
times, se=
rif; font-size: 12pt; color: #000000"><div>Can someone explain the cluster
=
policies to me? The explanation at <a href=3D"http://www.ovirt.org/Features=
/Even_VM_Count_Distribution">http://www.ovirt.org/Features/Even_VM_Count_Di=
stribution</a> is not quite clicking for me.<br
data-mce-bogus=3D"1"></div>=
<div><br></div><div><ul style=3D"padding: 0px; margin:
0.3em 0px 0px 1.6em;=
color: #2e3436; font-family: 'Source Sans Pro', sans-serif; font-size: 14p=
x; font-style: normal; font-variant: normal; font-weight: normal; letter-sp=
acing: normal; line-height: 20px; orphans: auto; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; widows: auto; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff;" dat=
a-mce-style=3D"padding: 0px; margin: 0.3em 0px 0px 1.6em; color: #2e3436; f=
ont-family: 'Source Sans Pro', sans-serif; font-size: 14px; font-style: nor=
mal; font-variant: normal; font-weight: normal; letter-spacing: normal; lin=
e-height: 20px; orphans: auto; text-align: start; text-indent: 0px; text-tr=
ansform: none; white-space: normal; widows: auto; word-spacing: 0px; -webki=
t-text-stroke-width: 0px; background-color: #ffffff;"><li
style=3D"line-hei=
ght: 20px;" data-mce-style=3D"line-height: 20px;"><b
style=3D"font-weight: =
600;" data-mce-style=3D"font-weight:
600;">HighVMSCount</b><span class=3D"A=
pple-converted-space"> </span>- Maximum VM limit. Exceeding it
qualifi=
es the host as overloaded. (<strong>Understood</strong>)</li><li
style=3D"l=
ine-height: 20px; margin-top: 10px;" data-mce-style=3D"line-height: 20px; m=
argin-top: 10px;"><b style=3D"font-weight: 600;"
data-mce-style=3D"font-wei=
ght: 600;">MigrationThreshold</b><span
class=3D"Apple-converted-space">&nbs=
p;</span>- defines a buffer before we start migrating VMs from the host (<s=
trong>Not quite grasping. If my High limit is 5 does this mean that it will=
only begin to move VMs when the count reaches 10?</strong>)</li><li
style=
=3D"line-height: 20px; margin-top: 10px;" data-mce-style=3D"line-height:
20=
px; margin-top: 10px;"><b style=3D"font-weight: 600;"
data-mce-style=3D"fon=
t-weight: 600;">SPMVMCountGrace</b><span
class=3D"Apple-converted-space">&n=
bsp;</span>- defines how many slots for VMs should be reserved on SPM hosts=
(the SPM host should have less load than others, so this variable defines =
how many VM less it should have) (<strong>Does this mean that if I ha=
ve a host with only 3 VMs the SPM will 3 VMs minus the SpmWmGrace? Or is th=
is HighVmCount minus SpmVmGrace
count?)</strong></li></ul></div><div><br></=
div><div><br></div></div></body></html>
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6:56 p.m.
New subject: Spam Re: Spam Cluster Polcies
------=_Part_9498_745562110.1403884598181
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Can anyone shed any light for me?
----- Original Message -----
From: "Maurice James" <mjames(a)media-node.com>
To: "users" <users(a)ovirt.org>
Sent: Thursday, June 26, 2014 6:20:23 PM
Subject: [ovirt-users] Spam Cluster Polcies
Can someone explain the cluster policies to me? The explanation at
http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite clicking for me.
* HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as overloaded. (
Understood )
* MigrationThreshold - defines a buffer before we start migrating VMs from the host (
Not quite grasping. If my High limit is 5 does this mean that it will only begin to move
VMs when the count reaches 10? )
* SPMVMCountGrace - defines how many slots for VMs should be reserved on SPM hosts
(the SPM host should have less load than others, so this variable defines how many VM less
it should have) ( Does this mean that if I have a host with only 3 VMs the SPM will 3 VMs
minus the SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
------=_Part_9498_745562110.1403884598181
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
<html><body><div style=3D"font-family: times new roman, new york,
times, se=
rif; font-size: 12pt; color: #000000"><div>Can anyone shed any light for
me=
?<br></div><hr id=3D"zwchr"><div
style=3D"color:#000;font-weight:normal;fon=
t-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;=
font-size:12pt;" data-mce-style=3D"color: #000; font-weight: normal; font-s=
tyle: normal; text-decoration: none; font-family: Helvetica,Arial,sans-seri=
f; font-size: 12pt;"><b>From: </b>"Maurice James"
&lt;mjames(a)media-node.com=
><br><b>To: </b>"users"
&lt;users(a)ovirt.org&gt;<br><b>Sent: </b>Thursday=
, June 26, 2014 6:20:23 PM<br><b>Subject: </b>[ovirt-users] Spam
Clus=
ter Polcies<br><div><br></div><div style=3D"font-family:
times new roman, n=
ew york, times, serif; font-size: 12pt; color: #000000" data-mce-style=3D"f=
ont-family: times new roman, new york, times, serif; font-size: 12pt; color=
: #000000;"><div>Can someone explain the cluster policies to me? The
explan=
ation at <a href=3D"http://www.ovirt.org/Features/Even_VM_Count_Distributio=
n" target=3D"_blank"
data-mce-href=3D"http://www.ovirt.org/Features/Even_VM=
_Count_Distribution">http://www.ovirt.org/Features/Even_VM_Count_...
on</a> is not quite clicking for
me.<br></div><div><br></div><div><ul style=
=3D"padding: 0px; margin: 0.3em 0px 0px 1.6em; color: #2e3436; font-family:=
'Source Sans Pro', sans-serif; font-size: 14px; font-style: normal; font-v=
ariant: normal; font-weight: normal; letter-spacing: normal; line-height: 2=
0px; orphans: auto; text-align: start; text-indent: 0px; text-transform: no=
ne; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stro=
ke-width: 0px; background-color: #ffffff;" data-mce-style=3D"padding: 0px; =
margin: 0.3em 0px 0px 1.6em; color: #2e3436; font-family: 'Source Sans Pro'=
, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; fo=
nt-weight: normal; letter-spacing: normal; line-height: 20px; orphans: auto=
; text-align: start; text-indent: 0px; text-transform: none; white-space: n=
ormal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; bac=
kground-color: #ffffff;"><li style=3D"line-height: 20px;"
data-mce-style=3D=
"line-height: 20px;"><b style=3D"font-weight: 600;"
data-mce-style=3D"font-=
weight: 600;">HighVMSCount</b><span
class=3D"Apple-converted-space"> <=
/span>- Maximum VM limit. Exceeding it qualifies the host as overloaded. (<=
strong>Understood</strong>)</li><li style=3D"line-height: 20px;
margin-top:=
10px;" data-mce-style=3D"line-height: 20px; margin-top: 10px;"><b
style=3D=
"font-weight: 600;" data-mce-style=3D"font-weight:
600;">MigrationThreshold=
</b><span class=3D"Apple-converted-space"> </span>-
defines a buffer b=
efore we start migrating VMs from the host (<strong>Not quite grasping. If =
my High limit is 5 does this mean that it will only begin to move VMs when =
the count reaches 10?</strong>)</li><li style=3D"line-height: 20px;
margin-=
top: 10px;" data-mce-style=3D"line-height: 20px; margin-top:
10px;"><b styl=
e=3D"font-weight: 600;" data-mce-style=3D"font-weight:
600;">SPMVMCountGrac=
e</b><span class=3D"Apple-converted-space"> </span>-
defines how many =
slots for VMs should be reserved on SPM hosts (the SPM host should have les=
s load than others, so this variable defines how many VM less it should hav=
e) (<strong>Does this mean that if I have a host with only 3 VMs the =
SPM will 3 VMs minus the SpmWmGrace? Or is this HighVmCount minus SpmVmGrac=
e
count?)</strong></li></ul></div><div><br></div><div><br></div></div><br>_=
______________________________________________<br>Users mailing list<br>Use=
rs@ovirt.org<br>http://lists.ovirt.org/mailman/listinfo/users<br></div><div=
<br></div></div></body></html>
------=_Part_9498_745562110.1403884598181--
2:54 p.m.
New subject: Spam Re: Spam Cluster Polcies
Answered it the other thread you've opened..
Thanks,
Gilad.
----- Original Message -----
From: "Maurice James" <mjames(a)media-node.com>
To: "users" <users(a)ovirt.org>
Sent: Friday, June 27, 2014 6:56:38 PM
Subject: [ovirt-users] Spam Re: Spam Cluster Polcies
Can anyone shed any light for me?
From: "Maurice James" <mjames(a)media-node.com>
To: "users" <users(a)ovirt.org>
Sent: Thursday, June 26, 2014 6:20:23 PM
Subject: [ovirt-users] Spam Cluster Polcies
Can someone explain the cluster policies to me? The explanation at
http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
clicking for me.
* HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as
overloaded. ( Understood )
* MigrationThreshold - defines a buffer before we start migrating VMs
from the host ( Not quite grasping. If my High limit is 5 does this mean
that it will only begin to move VMs when the count reaches 10? )
* SPMVMCountGrace - defines how many slots for VMs should be reserved on
SPM hosts (the SPM host should have less load than others, so this
variable defines how many VM less it should have) ( Does this mean that
if I have a host with only 3 VMs the SPM will 3 VMs minus the
SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
2:53 p.m.
----- Original Message -----
From: "Maurice James" <mjames(a)media-node.com>
To: "users" <users(a)ovirt.org>
Sent: Friday, June 27, 2014 1:20:23 AM
Subject: [ovirt-users] Spam Cluster Polcies
Can someone explain the cluster policies to me? The explanation at
http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
clicking for me.
* HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as
overloaded. ( Understood )
minimal #vms on host to enable the module (i.e worst host should have more than
HighVMSCount vms).
* MigrationThreshold - defines a buffer before we start migrating
VMs
from the host ( Not quite grasping. If my High limit is 5 does this mean
that it will only begin to move VMs when the count reaches 10? )
don't think that there's any relation with "HighLimit".
It means that migration will happen only if there is a difference of X vms or more between
worst host (source host) to destination host.
let say that you have 2 hosts. one has 10 vms and the second 8. if the threshold is 3, no
migration will happen (10-8 !> 3).
* SPMVMCountGrace - defines how many slots for VMs should be
reserved on
SPM hosts (the SPM host should have less load than others, so this
variable defines how many VM less it should have) ( Does this mean that
if I have a host with only 3 VMs the SPM will 3 VMs minus the
SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
you're right, the SPM host will have current + grace VMs in terms of module
calculations.
I think that this is problematic, it is likely to be selected as worst host candidate and
that's not the wanted behavior iiuc
imo, we should subtract (-) in overloaded hosts and add (+) in underutilized.
@Jirka?
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
3:57 p.m.
On 06/30/2014 01:53 PM, Gilad Chaplik wrote:
----- Original Message -----
> From: "Maurice James" <mjames(a)media-node.com>
> To: "users" <users(a)ovirt.org>
> Sent: Friday, June 27, 2014 1:20:23 AM
> Subject: [ovirt-users] Spam Cluster Polcies
>
> Can someone explain the cluster policies to me? The explanation at
> http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
> clicking for me.
>
>
>
> * HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as
> overloaded. ( Understood )
minimal #vms on host to enable the module (i.e worst host should have more than
HighVMSCount vms).
> * MigrationThreshold - defines a buffer before we start migrating VMs
> from the host ( Not quite grasping. If my High limit is 5 does this mean
> that it will only begin to move VMs when the count reaches 10? )
don't think that there's any relation with "HighLimit".
It means that migration will happen only if there is a difference of X vms or more
between worst host (source host) to destination host.
let say that you have 2 hosts. one has 10 vms and the second 8. if the threshold is 3, no
migration will happen (10-8 !> 3).
- exactly
> * SPMVMCountGrace - defines how many slots for VMs should be reserved on
> SPM hosts (the SPM host should have less load than others, so this
> variable defines how many VM less it should have) ( Does this mean that
> if I have a host with only 3 VMs the SPM will 3 VMs minus the
> SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
you're right, the SPM host will have current + grace VMs in terms of module
calculations.
I think that this is problematic, it is likely to be selected as worst host candidate and
that's not the wanted behavior iiuc
imo, we should subtract (-) in overloaded hosts and add (+) in underutilized.
- I think it's correct as it is, if the SpmVmGrace+currentVms >
HighVmCount it is overutilized and should be freed if possible.
--J
@Jirka?
>
>
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
4:11 p.m.
----- Original Message -----
From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
To: "Gilad Chaplik" <gchaplik(a)redhat.com>, "Maurice James"
<mjames(a)media-node.com>
Cc: "users" <users(a)ovirt.org>
Sent: Monday, June 30, 2014 3:57:29 PM
Subject: Re: [ovirt-users] Spam Cluster Polcies
On 06/30/2014 01:53 PM, Gilad Chaplik wrote:
> ----- Original Message -----
>> From: "Maurice James" <mjames(a)media-node.com>
>> To: "users" <users(a)ovirt.org>
>> Sent: Friday, June 27, 2014 1:20:23 AM
>> Subject: [ovirt-users] Spam Cluster Polcies
>>
>> Can someone explain the cluster policies to me? The explanation at
>> http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
>> clicking for me.
>>
>>
>>
>> * HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as
>> overloaded. ( Understood )
>
> minimal #vms on host to enable the module (i.e worst host should have more
> than HighVMSCount vms).
>
>> * MigrationThreshold - defines a buffer before we start migrating VMs
>> from the host ( Not quite grasping. If my High limit is 5 does this
>> mean
>> that it will only begin to move VMs when the count reaches 10? )
>
> don't think that there's any relation with "HighLimit".
> It means that migration will happen only if there is a difference of X vms
> or more between worst host (source host) to destination host.
>
> let say that you have 2 hosts. one has 10 vms and the second 8. if the
> threshold is 3, no migration will happen (10-8 !> 3).
- exactly
>
>> * SPMVMCountGrace - defines how many slots for VMs should be reserved
>> on
>> SPM hosts (the SPM host should have less load than others, so this
>> variable defines how many VM less it should have) ( Does this mean
>> that
>> if I have a host with only 3 VMs the SPM will 3 VMs minus the
>> SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
>
> you're right, the SPM host will have current + grace VMs in terms of module
> calculations.
> I think that this is problematic, it is likely to be selected as worst host
> candidate and that's not the wanted behavior iiuc
> imo, we should subtract (-) in overloaded hosts and add (+) in
> underutilized.
- I think it's correct as it is, if the SpmVmGrace+currentVms >
HighVmCount it is overutilized and should be freed if possible.
not sure I understand, let's take an example
2 hosts: spm: 8 #vms, hsm: 8 #vms.
SPMVMCountGrace = 2.
in this case the 'worst' host will be the SPM... shouldn't we deduct 2 from
spm and not add? we want less noise there.
--J
>
> @Jirka?
>
>>
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
4:19 p.m.
On 06/30/2014 03:11 PM, Gilad Chaplik wrote:
----- Original Message -----
> From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
> To: "Gilad Chaplik" <gchaplik(a)redhat.com>, "Maurice James"
<mjames(a)media-node.com>
> Cc: "users" <users(a)ovirt.org>
> Sent: Monday, June 30, 2014 3:57:29 PM
> Subject: Re: [ovirt-users] Spam Cluster Polcies
>
> On 06/30/2014 01:53 PM, Gilad Chaplik wrote:
>> ----- Original Message -----
>>> From: "Maurice James" <mjames(a)media-node.com>
>>> To: "users" <users(a)ovirt.org>
>>> Sent: Friday, June 27, 2014 1:20:23 AM
>>> Subject: [ovirt-users] Spam Cluster Polcies
>>>
>>> Can someone explain the cluster policies to me? The explanation at
>>> http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
>>> clicking for me.
>>>
>>>
>>>
>>> * HighVMSCount - Maximum VM limit. Exceeding it qualifies the host as
>>> overloaded. ( Understood )
>>
>> minimal #vms on host to enable the module (i.e worst host should have more
>> than HighVMSCount vms).
>>
>>> * MigrationThreshold - defines a buffer before we start migrating VMs
>>> from the host ( Not quite grasping. If my High limit is 5 does this
>>> mean
>>> that it will only begin to move VMs when the count reaches 10? )
>>
>> don't think that there's any relation with "HighLimit".
>> It means that migration will happen only if there is a difference of X vms
>> or more between worst host (source host) to destination host.
>>
>> let say that you have 2 hosts. one has 10 vms and the second 8. if the
>> threshold is 3, no migration will happen (10-8 !> 3).
>
> - exactly
>
>>
>>> * SPMVMCountGrace - defines how many slots for VMs should be reserved
>>> on
>>> SPM hosts (the SPM host should have less load than others, so this
>>> variable defines how many VM less it should have) ( Does this mean
>>> that
>>> if I have a host with only 3 VMs the SPM will 3 VMs minus the
>>> SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
>>
>> you're right, the SPM host will have current + grace VMs in terms of module
>> calculations.
>> I think that this is problematic, it is likely to be selected as worst host
>> candidate and that's not the wanted behavior iiuc
>> imo, we should subtract (-) in overloaded hosts and add (+) in
>> underutilized.
>
> - I think it's correct as it is, if the SpmVmGrace+currentVms >
> HighVmCount it is overutilized and should be freed if possible.
not sure I understand, let's take an example
2 hosts: spm: 8 #vms, hsm: 8 #vms.
SPMVMCountGrace = 2.
in this case the 'worst' host will be the SPM... shouldn't we deduct 2 from
spm and not add? we want less noise there.
- that's correct, the SPM will be marked as overutilized and the engine
will try to find a host to migrate some vms from the SPM. The SpmGrace
is not about lowering the noise it's about keeping the host less
utilized by running less VMs on it (which will also lower the noise,
because it will give the SPM host worse score when looking for target to
migrate to)
--J
>
> --J
>
>>
>> @Jirka?
>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users(a)ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>
>
4:20 p.m.
----- Original Message -----
From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
To: "Gilad Chaplik" <gchaplik(a)redhat.com>
Cc: "Maurice James" <mjames(a)media-node.com>, "users"
<users(a)ovirt.org>
Sent: Monday, June 30, 2014 4:19:06 PM
Subject: Re: [ovirt-users] Spam Cluster Polcies
On 06/30/2014 03:11 PM, Gilad Chaplik wrote:
> ----- Original Message -----
>> From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
>> To: "Gilad Chaplik" <gchaplik(a)redhat.com>, "Maurice
James"
>> <mjames(a)media-node.com>
>> Cc: "users" <users(a)ovirt.org>
>> Sent: Monday, June 30, 2014 3:57:29 PM
>> Subject: Re: [ovirt-users] Spam Cluster Polcies
>>
>> On 06/30/2014 01:53 PM, Gilad Chaplik wrote:
>>> ----- Original Message -----
>>>> From: "Maurice James" <mjames(a)media-node.com>
>>>> To: "users" <users(a)ovirt.org>
>>>> Sent: Friday, June 27, 2014 1:20:23 AM
>>>> Subject: [ovirt-users] Spam Cluster Polcies
>>>>
>>>> Can someone explain the cluster policies to me? The explanation at
>>>> http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
>>>> clicking for me.
>>>>
>>>>
>>>>
>>>> * HighVMSCount - Maximum VM limit. Exceeding it qualifies the
host
>>>> as
>>>> overloaded. ( Understood )
>>>
>>> minimal #vms on host to enable the module (i.e worst host should have
>>> more
>>> than HighVMSCount vms).
>>>
>>>> * MigrationThreshold - defines a buffer before we start migrating
>>>> VMs
>>>> from the host ( Not quite grasping. If my High limit is 5 does
>>>> this
>>>> mean
>>>> that it will only begin to move VMs when the count reaches 10? )
>>>
>>> don't think that there's any relation with "HighLimit".
>>> It means that migration will happen only if there is a difference of X
>>> vms
>>> or more between worst host (source host) to destination host.
>>>
>>> let say that you have 2 hosts. one has 10 vms and the second 8. if the
>>> threshold is 3, no migration will happen (10-8 !> 3).
>>
>> - exactly
>>
>>>
>>>> * SPMVMCountGrace - defines how many slots for VMs should be
>>>> reserved
>>>> on
>>>> SPM hosts (the SPM host should have less load than others, so
this
>>>> variable defines how many VM less it should have) ( Does this
mean
>>>> that
>>>> if I have a host with only 3 VMs the SPM will 3 VMs minus the
>>>> SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
>>>
>>> you're right, the SPM host will have current + grace VMs in terms of
>>> module
>>> calculations.
>>> I think that this is problematic, it is likely to be selected as worst
>>> host
>>> candidate and that's not the wanted behavior iiuc
>>> imo, we should subtract (-) in overloaded hosts and add (+) in
>>> underutilized.
>>
>> - I think it's correct as it is, if the SpmVmGrace+currentVms >
>> HighVmCount it is overutilized and should be freed if possible.
>
> not sure I understand, let's take an example
> 2 hosts: spm: 8 #vms, hsm: 8 #vms.
> SPMVMCountGrace = 2.
> in this case the 'worst' host will be the SPM... shouldn't we deduct 2
from
> spm and not add? we want less noise there.
>
- that's correct, the SPM will be marked as overutilized and the engine
will try to find a host to migrate some vms from the SPM. The SpmGrace
is not about lowering the noise it's about keeping the host less
utilized by running less VMs on it (which will also lower the noise,
because it will give the SPM host worse score when looking for target to
migrate to)
got it, thanks :-)
--J
>>
>> --J
>>
>>>
>>> @Jirka?
>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users(a)ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>
>>
5:31 p.m.
New subject: Spam Re: Spam Cluster Polcies
Thanks I think I got it now. I can adjust my cluster policy accordingly
----- Original Message -----
From: "Gilad Chaplik" <gchaplik(a)redhat.com>
To: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
Cc: "Maurice James" <mjames(a)media-node.com>, "users"
<users(a)ovirt.org>
Sent: Monday, June 30, 2014 9:20:31 AM
Subject: Re: [ovirt-users] Spam Cluster Polcies
----- Original Message -----
From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
To: "Gilad Chaplik" <gchaplik(a)redhat.com>
Cc: "Maurice James" <mjames(a)media-node.com>, "users"
<users(a)ovirt.org>
Sent: Monday, June 30, 2014 4:19:06 PM
Subject: Re: [ovirt-users] Spam Cluster Polcies
On 06/30/2014 03:11 PM, Gilad Chaplik wrote:
> ----- Original Message -----
>> From: "Jiri Moskovcak" <jmoskovc(a)redhat.com>
>> To: "Gilad Chaplik" <gchaplik(a)redhat.com>, "Maurice
James"
>> <mjames(a)media-node.com>
>> Cc: "users" <users(a)ovirt.org>
>> Sent: Monday, June 30, 2014 3:57:29 PM
>> Subject: Re: [ovirt-users] Spam Cluster Polcies
>>
>> On 06/30/2014 01:53 PM, Gilad Chaplik wrote:
>>> ----- Original Message -----
>>>> From: "Maurice James" <mjames(a)media-node.com>
>>>> To: "users" <users(a)ovirt.org>
>>>> Sent: Friday, June 27, 2014 1:20:23 AM
>>>> Subject: [ovirt-users] Spam Cluster Polcies
>>>>
>>>> Can someone explain the cluster policies to me? The explanation at
>>>> http://www.ovirt.org/Features/Even_VM_Count_Distribution is not quite
>>>> clicking for me.
>>>>
>>>>
>>>>
>>>> * HighVMSCount - Maximum VM limit. Exceeding it qualifies the
host
>>>> as
>>>> overloaded. ( Understood )
>>>
>>> minimal #vms on host to enable the module (i.e worst host should have
>>> more
>>> than HighVMSCount vms).
>>>
>>>> * MigrationThreshold - defines a buffer before we start migrating
>>>> VMs
>>>> from the host ( Not quite grasping. If my High limit is 5 does
>>>> this
>>>> mean
>>>> that it will only begin to move VMs when the count reaches 10? )
>>>
>>> don't think that there's any relation with "HighLimit".
>>> It means that migration will happen only if there is a difference of X
>>> vms
>>> or more between worst host (source host) to destination host.
>>>
>>> let say that you have 2 hosts. one has 10 vms and the second 8. if the
>>> threshold is 3, no migration will happen (10-8 !> 3).
>>
>> - exactly
>>
>>>
>>>> * SPMVMCountGrace - defines how many slots for VMs should be
>>>> reserved
>>>> on
>>>> SPM hosts (the SPM host should have less load than others, so
this
>>>> variable defines how many VM less it should have) ( Does this
mean
>>>> that
>>>> if I have a host with only 3 VMs the SPM will 3 VMs minus the
>>>> SpmWmGrace? Or is this HighVmCount minus SpmVmGrace count?)
>>>
>>> you're right, the SPM host will have current + grace VMs in terms of
>>> module
>>> calculations.
>>> I think that this is problematic, it is likely to be selected as worst
>>> host
>>> candidate and that's not the wanted behavior iiuc
>>> imo, we should subtract (-) in overloaded hosts and add (+) in
>>> underutilized.
>>
>> - I think it's correct as it is, if the SpmVmGrace+currentVms >
>> HighVmCount it is overutilized and should be freed if possible.
>
> not sure I understand, let's take an example
> 2 hosts: spm: 8 #vms, hsm: 8 #vms.
> SPMVMCountGrace = 2.
> in this case the 'worst' host will be the SPM... shouldn't we deduct 2
from
> spm and not add? we want less noise there.
>
- that's correct, the SPM will be marked as overutilized and the engine
will try to find a host to migrate some vms from the SPM. The SpmGrace
is not about lowering the noise it's about keeping the host less
utilized by running less VMs on it (which will also lower the noise,
because it will give the SPM host worse score when looking for target to
migrate to)
got it, thanks :-)
--J
>>
>> --J
>>
>>>
>>> @Jirka?
>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users(a)ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>
>>
3798
days inactive
3802
days old
8 comments
3 participants
participants (3)
-
Gilad Chaplik -
Jiri Moskovcak -
Maurice James