9:28 a.m.
Hi,
I see a strange behaviour -
Setup:
1 ovirtmgmt / ovirt-engine hsot
2 ovirt nodes / HVs
2 storage domains in same cluster & DC
HV1 => storage domain 1 (master)
HV2 => storage domain 2
Issue:
When I create a host with say ~40GB disk to be on HV2/storage_domain_2, it
does that via HV1 ? Why is that ? I realize a storage domain is "attached
to the cluster/dc", however, when creating the VM I explicitly seleted to
only run on HV2, so why would it still create the disk via HV1 ? The mgmt
network (for now) is only just that, a mgmt network, not meant to create 40
GB disks (dd from /dev/null) over NFS .. it's currently only a 100mbit
switch
Question:
How, if at all, can I make Ovirt create the Disk from the host where it's
meant to run on ?
Thanks,
Alex
--
| RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
1:39 p.m.
Hi Alex,
The storage domains are part of the Data Center, and should not be
related to clusters.
Clusters are used for migrating VMs, which are the qemu processes,
between hosts.
Disks are created on the storage domains regardless to clusters.
The host which write the data in the storage domain to create the disk
is the SPM.
You should have only one SPM in each Data Center (You can spot which
host is your SPM by looking at the SPM column in the hosts tab)
When you create a disk you should be able to choose the storage domain
which you want the disk to be created on.
Regards,
Maor
On 01/17/2013 05:28 PM, Alex Leonhardt wrote:
Hi,
I see a strange behaviour -
Setup:
1 ovirtmgmt / ovirt-engine hsot
2 ovirt nodes / HVs
2 storage domains in same cluster & DC
HV1 => storage domain 1 (master)
HV2 => storage domain 2
Issue:
When I create a host with say ~40GB disk to be on HV2/storage_domain_2,
it does that via HV1 ? Why is that ? I realize a storage domain is
"attached to the cluster/dc", however, when creating the VM I explicitly
seleted to only run on HV2, so why would it still create the disk via
HV1 ? The mgmt network (for now) is only just that, a mgmt network, not
meant to create 40 GB disks (dd from /dev/null) over NFS .. it's
currently only a 100mbit switch
Question:
How, if at all, can I make Ovirt create the Disk from the host where
it's meant to run on ?
1. You can create a new Data Center and separate the
host and the
sotrage domain to be used only there.
2. You can move your current SPM host to maintenance which will cause
your other host to become SPM and write the data to the storage domain
it self.
What is the reason you want it to act like this?
Thanks,
Alex
--
| RHCE | Senior Systems Engineer | www.vcore.co <http://www.vcore.co> |
www.vsearchcloud.com <http://www.vsearchcloud.com> |
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2:04 p.m.
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Hiya,
Yes i can choose the storage domain, but I cannot force the host that is
to be used for creating it. Even with 1Gbit network, creating a 80GB
disk / 40 GB disk is still significantly longer process than actually
required when doing a "dd" of /dev/null over the network.
Is it possible to manually change who is SPM master, create the
disks/VMs required, and change it back ? How would that change affect
the running VMs / would they try to migrate to the other HV ?
Alex
On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
Hi Alex,
The storage domains are part of the Data Center, and should not be
related to clusters.
Clusters are used for migrating VMs, which are the qemu processes,
between hosts.
Disks are created on the storage domains regardless to clusters.
The host which write the data in the storage domain to create the disk
is the SPM.
You should have only one SPM in each Data Center (You can spot which
host is your SPM by looking at the SPM column in the hosts tab)
When you create a disk you should be able to choose the storage domain
which you want the disk to be created on.
Regards,
Maor
--------------030502000706000808000203
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<font size="-1"><font face="Tahoma">Hiya,<br>
<br>
Yes i can choose the storage domain, but I cannot force the host
that is to be used for creating it. Even with 1Gbit network,
creating a 80GB disk / 40 GB disk is still significantly longer
process than actually required when doing a "dd" of /dev/null
over the network. <br>
<br>
Is it possible to manually change who is SPM master, create the
disks/VMs required, and change it back ? How would that change
affect the running VMs / would they try to migrate to the other
HV ? <br>
<br>
Alex<br>
<br>
</font></font><br>
On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
<blockquote cite="mid:50F85373.4080101@redhat.com"
type="cite">
<pre wrap="">Hi Alex,
The storage domains are part of the Data Center, and should not be
related to clusters.
Clusters are used for migrating VMs, which are the qemu processes,
between hosts.
Disks are created on the storage domains regardless to clusters.
The host which write the data in the storage domain to create the disk
is the SPM.
You should have only one SPM in each Data Center (You can spot which
host is your SPM by looking at the SPM column in the hosts tab)
When you create a disk you should be able to choose the storage domain
which you want the disk to be created on.
Regards,
Maor
</pre>
</blockquote>
</body>
</html>
--------------030502000706000808000203--
2:42 p.m.
Hi Alex,
See my last respond, I add a comment inline there.
See my comments inline
Regards,
Maor.
On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
Hiya,
Yes i can choose the storage domain, but I cannot force the host that is
to be used for creating it. Even with 1Gbit network, creating a 80GB
disk / 40 GB disk is still significantly longer process than actually
required when doing a "dd" of /dev/null over the network.
Is it possible to manually change who is SPM master, create the
disks/VMs required, and change it back ?
You can maintain your SPM host, and active
it back again, this will
change the SPM to be the other host which you want.
How would that change affect the running VMs / would they try to
migrate to the other HV ?
The VM migration will still be under the same cluster.
SPM is simply used to write to the storage domains, one of the reasons
we use the SPM is to avoid collisions when hosts write to the same
storage domain.
Alex
On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
> Hi Alex,
> The storage domains are part of the Data Center, and should not be
> related to clusters.
> Clusters are used for migrating VMs, which are the qemu processes,
> between hosts.
> Disks are created on the storage domains regardless to clusters.
>
> The host which write the data in the storage domain to create the disk
> is the SPM.
> You should have only one SPM in each Data Center (You can spot which
> host is your SPM by looking at the SPM column in the hosts tab)
> When you create a disk you should be able to choose the storage domain
> which you want the disk to be created on.
>
> Regards,
> Maor
3:34 a.m.
Hmmm, but if I put the SPM host into Maint mode, then all the VMs would
either be migrated or (in my case, all set to manual) not available during
that time, correct ?
Would changing the SPM priority in the host config have the desired effect
w/o putting the host into Maint mode ? Or can I only do that when the host
is in Maint mode ?
On 17 January 2013 20:42, Maor Lipchuk <mlipchuk(a)redhat.com> wrote:
Hi Alex,
See my last respond, I add a comment inline there.
See my comments inline
Regards,
Maor.
On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
> Hiya,
>
> Yes i can choose the storage domain, but I cannot force the host that is
> to be used for creating it. Even with 1Gbit network, creating a 80GB
> disk / 40 GB disk is still significantly longer process than actually
> required when doing a "dd" of /dev/null over the network.
>
> Is it possible to manually change who is SPM master, create the
> disks/VMs required, and change it back ?
You can maintain your SPM host, and active it back again, this will
change the SPM to be the other host which you want.
> How would that change affect the running VMs / would they try to migrate
to the other HV ?
The VM migration will still be under the same cluster.
SPM is simply used to write to the storage domains, one of the reasons
we use the SPM is to avoid collisions when hosts write to the same
storage domain.
>
> Alex
>
>
> On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
>> Hi Alex,
>> The storage domains are part of the Data Center, and should not be
>> related to clusters.
>> Clusters are used for migrating VMs, which are the qemu processes,
>> between hosts.
>> Disks are created on the storage domains regardless to clusters.
>>
>> The host which write the data in the storage domain to create the disk
>> is the SPM.
>> You should have only one SPM in each Data Center (You can spot which
>> host is your SPM by looking at the SPM column in the hosts tab)
>> When you create a disk you should be able to choose the storage domain
>> which you want the disk to be created on.
>>
>> Regards,
>> Maor
--
| RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
3:36 a.m.
I was just thinking - maybe adding a setting to storage domains who's the
"master" for that specific storage domain would get around this ?
e.g. storage_domain_1 => master = HV1, storage_domain_2 => master = HV2,
etc. etc.
What do you think ?
Alex
On 18 January 2013 09:34, Alex Leonhardt <alex.tuxx(a)gmail.com> wrote:
Hmmm, but if I put the SPM host into Maint mode, then all the VMs
would
either be migrated or (in my case, all set to manual) not available during
that time, correct ?
Would changing the SPM priority in the host config have the desired effect
w/o putting the host into Maint mode ? Or can I only do that when the host
is in Maint mode ?
On 17 January 2013 20:42, Maor Lipchuk <mlipchuk(a)redhat.com> wrote:
> Hi Alex,
> See my last respond, I add a comment inline there.
> See my comments inline
>
> Regards,
> Maor.
>
> On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
> > Hiya,
> >
> > Yes i can choose the storage domain, but I cannot force the host that is
> > to be used for creating it. Even with 1Gbit network, creating a 80GB
> > disk / 40 GB disk is still significantly longer process than actually
> > required when doing a "dd" of /dev/null over the network.
> >
> > Is it possible to manually change who is SPM master, create the
> > disks/VMs required, and change it back ?
> You can maintain your SPM host, and active it back again, this will
> change the SPM to be the other host which you want.
> > How would that change affect the running VMs / would they try to
> migrate to the other HV ?
> The VM migration will still be under the same cluster.
>
> SPM is simply used to write to the storage domains, one of the reasons
> we use the SPM is to avoid collisions when hosts write to the same
> storage domain.
>
> >
> > Alex
> >
> >
> > On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
> >> Hi Alex,
> >> The storage domains are part of the Data Center, and should not be
> >> related to clusters.
> >> Clusters are used for migrating VMs, which are the qemu processes,
> >> between hosts.
> >> Disks are created on the storage domains regardless to clusters.
> >>
> >> The host which write the data in the storage domain to create the disk
> >> is the SPM.
> >> You should have only one SPM in each Data Center (You can spot which
> >> host is your SPM by looking at the SPM column in the hosts tab)
> >> When you create a disk you should be able to choose the storage domain
> >> which you want the disk to be created on.
> >>
> >> Regards,
> >> Maor
>
>
>
--
| RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
--
| RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
3:08 a.m.
Hi Alex,
What that you suggest is pretty similar to have two different Data Center.
One with host HV1 and storage domain 1.
The other with storage_domain_2 and HV2 host.
This might work, and your two hosts will be SPM, one for DC1 and the
other for DC2
I'm not sure that I follow your suggestion about setting the storage
domains who is the master (the SPM will still stay the same host as before).
Regards,
Maor
On 01/18/2013 11:36 AM, Alex Leonhardt wrote:
I was just thinking - maybe adding a setting to storage domains
who's
the "master" for that specific storage domain would get around this ?
e.g. storage_domain_1 => master = HV1, storage_domain_2 => master = HV2,
etc. etc.
What do you think ?
Alex
On 18 January 2013 09:34, Alex Leonhardt <alex.tuxx(a)gmail.com
<mailto:alex.tuxx@gmail.com>> wrote:
Hmmm, but if I put the SPM host into Maint mode, then all the VMs
would either be migrated or (in my case, all set to manual) not
available during that time, correct ?
Would changing the SPM priority in the host config have the desired
effect w/o putting the host into Maint mode ? Or can I only do that
when the host is in Maint mode ?
On 17 January 2013 20:42, Maor Lipchuk <mlipchuk(a)redhat.com
<mailto:mlipchuk@redhat.com>> wrote:
Hi Alex,
See my last respond, I add a comment inline there.
See my comments inline
Regards,
Maor.
On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
> Hiya,
>
> Yes i can choose the storage domain, but I cannot force the
host that is
> to be used for creating it. Even with 1Gbit network, creating
a 80GB
> disk / 40 GB disk is still significantly longer process than
actually
> required when doing a "dd" of /dev/null over the network.
>
> Is it possible to manually change who is SPM master, create the
> disks/VMs required, and change it back ?
You can maintain your SPM host, and active it back again, this will
change the SPM to be the other host which you want.
> How would that change affect the running VMs / would they try
to migrate to the other HV ?
The VM migration will still be under the same cluster.
SPM is simply used to write to the storage domains, one of the
reasons
we use the SPM is to avoid collisions when hosts write to the same
storage domain.
>
> Alex
>
>
> On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
>> Hi Alex,
>> The storage domains are part of the Data Center, and should
not be
>> related to clusters.
>> Clusters are used for migrating VMs, which are the qemu
processes,
>> between hosts.
>> Disks are created on the storage domains regardless to clusters.
>>
>> The host which write the data in the storage domain to create
the disk
>> is the SPM.
>> You should have only one SPM in each Data Center (You can
spot which
>> host is your SPM by looking at the SPM column in the hosts tab)
>> When you create a disk you should be able to choose the
storage domain
>> which you want the disk to be created on.
>>
>> Regards,
>> Maor
--
| RHCE | Senior Systems Engineer | www.vcore.co
<http://www.vcore.co> | www.vsearchcloud.com
<http://www.vsearchcloud.com> |
--
| RHCE | Senior Systems Engineer | www.vcore.co <http://www.vcore.co> |
www.vsearchcloud.com <http://www.vsearchcloud.com> |
2:59 a.m.
Hi Alex,
Please, see my comments inline.
Regards,
Maor
On 01/18/2013 11:34 AM, Alex Leonhardt wrote:
Hmmm, but if I put the SPM host into Maint mode, then all the VMs
would
either be migrated or (in my case, all set to manual) not available
during that time, correct ?
Yes, the other way that you can do to change your SPM
host is to ssh
into your SPM host and restart your VDSM service (service vdsmd restart).
I would recommend you, first to check if there are no running tasks
there (vdsClient 0 getAllTasksStatuses), simply because restart of VDSM
will cancel them.
Would changing the SPM priority in the host config have the desired
effect w/o putting the host into Maint mode ? Or can I only do that when
the host is in Maint mode ?
You can't change your SPM host while your host is
up and running.
On 17 January 2013 20:42, Maor Lipchuk <mlipchuk(a)redhat.com
<mailto:mlipchuk@redhat.com>> wrote:
Hi Alex,
See my last respond, I add a comment inline there.
See my comments inline
Regards,
Maor.
On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
> Hiya,
>
> Yes i can choose the storage domain, but I cannot force the host
that is
> to be used for creating it. Even with 1Gbit network, creating a 80GB
> disk / 40 GB disk is still significantly longer process than actually
> required when doing a "dd" of /dev/null over the network.
>
> Is it possible to manually change who is SPM master, create the
> disks/VMs required, and change it back ?
You can maintain your SPM host, and active it back again, this will
change the SPM to be the other host which you want.
> How would that change affect the running VMs / would they try to
migrate to the other HV ?
The VM migration will still be under the same cluster.
SPM is simply used to write to the storage domains, one of the reasons
we use the SPM is to avoid collisions when hosts write to the same
storage domain.
>
> Alex
>
>
> On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
>> Hi Alex,
>> The storage domains are part of the Data Center, and should not be
>> related to clusters.
>> Clusters are used for migrating VMs, which are the qemu processes,
>> between hosts.
>> Disks are created on the storage domains regardless to clusters.
>>
>> The host which write the data in the storage domain to create the
disk
>> is the SPM.
>> You should have only one SPM in each Data Center (You can spot which
>> host is your SPM by looking at the SPM column in the hosts tab)
>> When you create a disk you should be able to choose the storage
domain
>> which you want the disk to be created on.
>>
>> Regards,
>> Maor
--
| RHCE | Senior Systems Engineer | www.vcore.co <http://www.vcore.co> |
www.vsearchcloud.com <http://www.vsearchcloud.com> |
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