6:31 a.m.
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Hi everyone!
There's a use case for the $subject that is really favorable for us (CI guy=
s)
and I want to ask you if it's possible, if it's viable and if not already t=
here
if I should open a rfe.
The case is when you want to spin up vms from a template, but use them only
once and remove them afterwards (for example, running tests), if you had the
option to have a shared storage where you store the templates, and then a l=
ocal
storage where you spin up the vms, that allows really fast (local) storage =
for
the vms and avoids you having to setup a clustered storage (gluster, etc) f=
or
those vms that do not need any of those features.
So is that already possible? (For other threads and what I've tested seems =
not)
Is that viable? Can it be implemented on ovirt?
Thanks!
--=20
David Caro
Red Hat S.L.
Continuous Integration Engineer - EMEA ENG Virtualization R&D
Tel.: +420 532 294 605
Email: dcaro(a)redhat.com
Web: www.redhat.com
RHT Global #: 82-62605
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8:13 a.m.
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On 08/05/15 13:31, David Caro wrote:
Hi everyone!
There's a use case for the $subject that is really favorable for us
(CI guys) and I want to ask you if it's possible, if it's viable
and if not already there if I should open a rfe.
The case is when you want to spin up vms from a template, but use
them only once and remove them afterwards (for example, running
tests), if you had the option to have a shared storage where you
store the templates, and then a local storage where you spin up the
vms, that allows really fast (local) storage for the vms and avoids
you having to setup a clustered storage (gluster, etc) for those
vms that do not need any of those features.
So is that already possible? (For other threads and what I've
tested seems not) Is that viable? Can it be implemented on ovirt?
I guess you talk about this feature:
http://www.ovirt.org/Features/Mixed_Types_Data_Center
but imho the feature page is out of date
- --
Mit freundlichen Grüßen / Regards
Sven Kieske
Systemadministrator
Mittwald CM Service GmbH & Co. KG
Königsberger Straße 6
32339 Espelkamp
T: +49-5772-293-100
F: +49-5772-293-333
https://www.mittwald.de
Geschäftsführer: Robert Meyer
St.Nr.: 331/5721/1033, USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhaus
en
Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad
Oeynhausen
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12:22 p.m.
----- Original Message -----
From: "Sven Kieske" <s.kieske(a)mittwald.de>
Sent: Friday, May 8, 2015 9:13:08 AM
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Hash: SHA1
On 08/05/15 13:31, David Caro wrote:
>
> Hi everyone!
>
>
> There's a use case for the $subject that is really favorable for us
> (CI guys) and I want to ask you if it's possible, if it's viable
> and if not already there if I should open a rfe.
>
> The case is when you want to spin up vms from a template, but use
> them only once and remove them afterwards (for example, running
> tests), if you had the option to have a shared storage where you
> store the templates, and then a local storage where you spin up the
> vms, that allows really fast (local) storage for the vms and avoids
> you having to setup a clustered storage (gluster, etc) for those
> vms that do not need any of those features.
>
>
> So is that already possible? (For other threads and what I've
> tested seems not) Is that viable? Can it be implemented on ovirt?
>
I guess you talk about this feature:
http://www.ovirt.org/Features/Mixed_Types_Data_Center
http://www.ovirt.org/Features/Mixed_Types_Data_Center is about being
able to mix different types of shared storage domains (NFS, iSCSI, FC,
...) within the same Data-Center.
We have this capability since oVirt 3.4 IIRC.
It is not related to mixing shared storage and local storage within
the same Data-Center, which is what David is asking here.
but imho the feature page is out of date
- --
Mit freundlichen Grüßen / Regards
Sven Kieske
Systemadministrator
Mittwald CM Service GmbH & Co. KG
Königsberger Straße 6
32339 Espelkamp
T: +49-5772-293-100
F: +49-5772-293-333
https://www.mittwald.de
Geschäftsführer: Robert Meyer
St.Nr.: 331/5721/1033, USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhaus
en
Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad
Oeynhausen
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_______________________________________________
Devel mailing list
Devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/devel
10:58 a.m.
On 08-05-2015 8:31, David Caro wrote:
[...]
The case is when you want to spin up vms from a template, but use them only
once and remove them afterwards (for example, running tests), if you had the
option to have a shared storage where you store the templates, and then a local
storage where you spin up the vms, that allows really fast (local) storage for
the vms and avoids you having to setup a clustered storage (gluster, etc) for
those vms that do not need any of those features.
So is that already possible? (For other threads and what I've tested seems not)
Is that viable? Can it be implemented on ovirt?
Hi David,
You could use a local replica-1 gluster storage domain for this.
replica-1 => no split brains + local performance + no complexity + no
overhead + gluster benefits
It just works fine.
PS: I'm currently researching the best way to live replicate local
replica-1 volumes by using geo-replication, adding a replica-2 brick,
using libvirt blockcopy or oVirt API.
Best regards,
Christopher.
11:17 a.m.
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Thanks Christopher!
That will force me to have as many gluster storages as hosts? Or it will a=
llow
to have one gluster setup with each of the hosts accessing to the local sto=
rage?
I will investigate, but I'd prefer if I did not have to use any external
service at all (in the end, is just local storage)
On 05/11, Christopher Pereira wrote:
On 08-05-2015 8:31, David Caro wrote:
>[...]
>The case is when you want to spin up vms from a template, but use them o=
nly
>once and remove them afterwards (for example, running tests), if
you had=
the
>option to have a shared storage where you store the templates,
and then =
a local
>storage where you spin up the vms, that allows really fast
(local) stora=
ge for
>the vms and avoids you having to setup a clustered storage
(gluster, etc=
) for
>those vms that do not need any of those features.
>
>So is that already possible? (For other threads and what I've tested see=
ms not)
>Is that viable? Can it be implemented on ovirt?
=20
Hi David,
=20
You could use a local replica-1 gluster storage domain for this.
replica-1 =3D> no split brains + local performance + no complexity + no
overhead + gluster benefits
It just works fine.
=20
PS: I'm currently researching the best way to live replicate local replic=
a-1
volumes by using geo-replication, adding a replica-2 brick, using
libvirt
blockcopy or oVirt API.
=20
Best regards,
Christopher.
=20
--=20
David Caro
Red Hat S.L.
Continuous Integration Engineer - EMEA ENG Virtualization R&D
Tel.: +420 532 294 605
Email: dcaro(a)redhat.com
Web: www.redhat.com
RHT Global #: 82-62605
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11:33 a.m.
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On 11-05-2015 13:17, David Caro wrote:
Thanks Christopher!
That will force me to have as many gluster storages as hosts? Or it will allow
to have one gluster setup with each of the hosts accessing to the local storage?
You will need one volume (with 1 local brick) for each host that needs
local storage.
If you need this for many hosts, you could use a script for creating the
local volumes.
Something like this.
HOST=host1
VOL=local-$HOST
BRICK=/mnt/disk/gluster-bricks/$VOL
mkdir $BRICK
*chown vdsm:kvm *$BRICK
*gluster vol create $VOL* <localhost>:$BRICK
*gluster vol start $VOL
*Then *in oVirt engine, you add *this new**storage manually or use the
rest API to automate it.
Use appropriate volume names referencing the host.
I will investigate, but I'd prefer if I did not have to use any
external
service at all (in the end, is just local storage)
IMO, it's quite easy to
setup gluster (2 commands), it is well supported
by oVirt and it gives you many benefits you could use in the future like
migrating the VM to other host, create snapshots, geo-replicate the
storage, etc.
--------------010709080006080305070302
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<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 11-05-2015 13:17, David Caro
wrote:<br>
</div>
<blockquote cite="mid:20150511161732.GD24123@brete.redhat.com"
type="cite">
<pre wrap="">Thanks Christopher!
That will force me to have as many gluster storages as hosts? Or it will allow
to have one gluster setup with each of the hosts accessing to the local
storage?</pre>
</blockquote>
You will need one volume (with 1 local brick) for each host that
needs local storage.<br>
<br>
If you need this for many hosts, you could use a script for creating
the local volumes.<br>
Something like this.<br>
<br>
HOST=host1<br>
VOL=local-$HOST<br>
BRICK=/mnt/disk/gluster-bricks/$VOL<br>
<meta charset="utf-8">
mkdir $BRICK<br>
<meta charset="utf-8">
<b style="font-weight:normal;"
id="docs-internal-guid-4b7e62b6-43c9-7949-bcd1-87d25ffc2ed1"><span
style="font-size:15px;font-family:Arial;color:#000000;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">chown
vdsm:kvm </span></b>$BRICK<br>
<meta charset="utf-8">
<b style="font-weight:normal;"
id="docs-internal-guid-4b7e62b6-43c9-e058-1522-5f8f6c2f42cd"><span
style="font-size:15px;font-family:Arial;color:#000000;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">gluster
vol create $VOL</span></b> <localhost>:$BRICK<br>
<b style="font-weight:normal;"
id="docs-internal-guid-4b7e62b6-43c9-e058-1522-5f8f6c2f42cd"><span
style="font-size:15px;font-family:Arial;color:#000000;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">gluster
vol start $VOL<br>
<br>
</span></b>Then <b style="font-weight:normal;"
id="docs-internal-guid-4b7e62b6-43c9-e058-1522-5f8f6c2f42cd"><span
style="font-size:15px;font-family:Arial;color:#000000;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">in
oVirt engine, you add </span></b>this new<b
style="font-weight:normal;"
id="docs-internal-guid-4b7e62b6-43c9-e058-1522-5f8f6c2f42cd"><span
style="font-size:15px;font-family:Arial;color:#000000;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">
</span></b>storage manually or use the rest API to automate
it.<br>
Use appropriate volume names referencing the host.<br>
<br>
<blockquote cite="mid:20150511161732.GD24123@brete.redhat.com"
type="cite">
<pre wrap="">I will investigate, but I'd prefer if I did not
have to use any external
service at all (in the end, is just local storage)</pre>
</blockquote>
IMO, it's quite easy to setup gluster (2 commands), it is well
supported by oVirt and it gives you many benefits you could use in
the future like migrating the VM to other host, create snapshots,
geo-replicate the storage, etc.<br>
<br>
</body>
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3266
days inactive
3269
days old
5 comments
4 participants
participants (4)
-
Christopher Pereira -
David Caro -
Einav Cohen -
Sven Kieske