2:44 p.m.
Hello,
I'd like to ask community, what is the best way to use oVirt in the
following hardware configuration:
Three servers connected 1GB network. Each server - 32 threads, 256GB
RAM, 4TB RAID.
Please note that a local storage and an 1GB network is a typical
hardware configuration for almost any dedicated hosting.
Unfortunately, oVirt doesn't support multi-node local storage clusters.
And Gluster/CEPH doesn't work well over 1G network. It looks like that
the only way to use oVirt in a three-node cluster is to share local
storages over NFS. At least it makes possible to migrate VMs and move
disks among hardware nodes.
Does somebody have such setup?
Thanks
5:09 p.m.
Hi,
We have all nodes like you (5 currently), and have them setup as NFS instead of local
storage.
You have slight overhead because it's NFS, but not so much, and it allows you to
migrate VMs and disks, even if it's a manual disk, eg no HA will be possible.
So yeah, to me, it's a good option given your setup.
Best,
12:46 a.m.
--_000_2e54f1f30c004db3ab5621ff68a2ffeeacroniscom_
Content-Type: text/plain; charset="us-ascii"
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Christophe,
Where is the engine running? Did you use one of NFSs for hosted-engine?
Thank you
From: Christophe TREFOIS <christophe.trefois(a)uni.lu Sent: Mar
4, 2016 2:09 AM
To: Pavel Gashev; users(a)ovirt.org
Subject: RE: Multi-node cluster with local storage
Hi,
We have all nodes like you (5 currently), and have them setup as NFS instea=
d of local storage.
You have slight overhead because it's NFS, but not so much, and it allows y=
ou to migrate VMs and disks, even if it's a manual disk, eg no HA will be p=
ossible.
So yeah, to me, it's a good option given your setup.
Best,
wing
e
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<div <div
style=3D"font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12.=
0pt; color:#1F497D" <p
dir=3D"ltr">Christophe,</p <p
dir=3D"ltr">Where is the engine running? Did you use one of NFSs for hos=
ted-engine?</p <p dir=3D"ltr">Thank
you</p <div
id=3D"x_signature-x" style=3D"font-family:Calibri,Arial,Helvetica,sans=
-serif; font-size:12.0pt; color:#1F497D"
<br </div </div <div
id=3D"x_quoted_header" style=3D"clear:both"><br <div style=3D"border:none; border-top:solid #E1E1E1
1.0pt; padding:3.0pt 0c=
m 0cm 0cm" <span
style=3D"font-size:11.0pt;
font-family:'Calibri','sans-serif'"><b>Fro=
m:</b> Christophe TREFOIS &lt;christophe.trefois(a)uni.lu&gt;<br <b>Sent:</b> Mar 4, 2016 2:09 AM<br <b>To:</b> Pavel Gashev; users(a)ovirt.org<br <b>Subject:</b> RE: Multi-node cluster with local
storage<br </span></div </div <br
type=3D"attribution" </div <font size=3D"2"><span
style=3D"font-size:10pt;" <div
class=3D"PlainText">Hi,<br
<br We have all nodes like you (5
currently), and have them setup as NFS instea=
d of local storage.<br <br You have
slight overhead because it's NFS, but not so much, and it allows y=
ou to migrate VMs and disks, even if it's a manual disk, eg no HA will be p=
ossible.<br <br So yeah,
to me, it's a good option given your setup.<br
<br Best,<br <br > -----Original
Message-----<br > From:
users-bounces(a)ovirt.org [<a href=3D"mailto:users-bounces@ovirt.o=
rg">mailto:users-bounces@ovirt.org</a>] On Behalf<br > Of Pavel Gashev<br >
Sent: jeudi 3 mars 2016 21:44<br >
To: users(a)ovirt.org<br > Subject: [ovirt-users]
Multi-node cluster with local storage<br >
<br > Hello,<br >
<br > I'd like to ask community, what is the best way to
use oVirt in the fo=
llowing<br > hardware
configuration:<br > <br > Three servers connected 1GB network. Each server - 32
threads, 256GB R=
AM,<br > 4TB RAID.<br > <br >
Please note that a local storage and an 1GB network is a typical hardw=
are<br > configuration for almost
any dedicated hosting.<br > <br > Unfortunately, oVirt doesn't support multi-node
local storage clusters=
.<br > And Gluster/CEPH doesn't work well over 1G
network. It looks like that=
the<br > only way to use oVirt in a
three-node cluster is to share local storag=
es over<br > NFS. At least it makes
possible to migrate VMs and move disks among<br=
> hardware nodes.<br >
<br > Does somebody have such setup?<br > <br >
Thanks<br >
_______________________________________________<br >
Users mailing list<br > Users(a)ovirt.org<br > <a
href=3D"http://lists.ovirt.org/mailman/listinfo/users">http:...
.ovirt.org/mailman/listinfo/users</a><br
</div </span></font </body
</html
--_000_2e54f1f30c004db3ab5621ff68a2ffeeacroniscom_--
only way to use oVirt in a three-node cluster is to share local
storages =
over
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--_000_A59A9C5DABA740C4BC588D04B4618567unilu_--
3:22 a.m.
On 03/04/2016 02:14 AM, Pavel Gashev wrote:
Do you know of reported problems with Gluster over 1Gb network? I think
10Gb is recommended, but 1Gb can also be used for gluster.
(We use it in our lab setup, and haven't encountered any issues so far
but of course, the workload may be different - hence the question)
4:43 a.m.
On 04/03/16 12:22, "Sahina Bose" <sabose(a)redhat.com> wrote:
Let's calculate. If I have a three node replicated gluster volume, each block writing
on a node copies the block to the other two nodes. Thus, maximal write performance
can't be above 50MB/s. Even it's acceptable for my workload, things get worse in
failure recovering scenario. Gluster works with files. When a node fails and then recovers
(even it's just a plain reboot), gluster copies the whole file over network if the
file is changed during node outage. So if I have a 100GB VM disk, and guest system has
written a 512-byte block to the disk, the whole 100GB will be copied during recovery. It
might take 20 minutes for 100GB, and 3 hours for 1TB. And network will be 100% busy during
recovery, so VMs on other nodes will wait for I/O most of time. In other words, a plain
reboot of a node would result in datacenter out of service for several hours.
Things might be better if you have a distributed+replicated gluster volume. It requires at
least six nodes. But things are still bad when you try to rebalance the volume after
adding new bricks, or when a node has really failed and replaced.
Thus, 1GB network is ok for a lab, but it's not ok for production. IMHO.
4:50 a.m.
On 03/04/2016 04:13 PM, Pavel Gashev wrote:
Most of the problems that you outline here - related to healing and
replacing are addressed with the sharding translator. Sharding breaks
the large image file into smaller files, so that the entire file does
not have to be copied. More details here -
http://blog.gluster.org/2015/12/introducing-shard-translator/
6 a.m.
On 04/03/16 13:50, "Sahina Bose" <sabose(a)redhat.com> wrote:
Sure, I meant the same by mentioning distributed+replicated volumes. Actually,
distributed+striped+replicated -
https://access.redhat.com/documentation/en-US/Red_Hat_Storage/2.0/html/Ad...
7:39 a.m.
On 03/04/2016 05:30 PM, Pavel Gashev wrote:
Ok. Sharding is not the same as striped volumes in gluster. With
striping, like you mentioned, you would require more number of nodes to
form the striped set in addition to the replica set.( so 6 nodes since
you need replica 3 )
Sharding can however work with 3 nodes - so on the replica 3 gluster
volume that you create, you can turn on the volume option
"features.shard on", to turn on this feature.
3377
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3417
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10 comments
3 participants
participants (3)
-
Christophe TREFOIS -
Pavel Gashev -
Sahina Bose