5:47 p.m.
Hi Guys,
As I'm still quite new in oVirt - I have some problems finding the problem on this
one.My Hosted Engine (4.3.2) is constantly dieing (even when the Global Maintenance is
enabled).My interpretation of the logs indicates some lease problem , but I don't get
the whole picture ,yet.
I'm attaching the output of 'journalctl -f | grep -Ev "Started
Session|session opened|session closed"' after I have tried to power on the hosted
engine (hosted-engine --vm-start).
The nodes are fully updated and I don't see anything in the gluster v5.5 logs, but I
can double check.
Any hints are appreciated and thanks in advance.
Best Regards,Strahil Nikolov
3:16 a.m.
On Sun, Mar 31, 2019 at 11:49 PM Strahil Nikolov <hunter86_bg(a)yahoo.com>
wrote:
Hi Guys,
As I'm still quite new in oVirt - I have some problems finding the problem
on this one.
My Hosted Engine (4.3.2) is constantly dieing (even when the Global
Maintenance is enabled).
My interpretation of the logs indicates some lease problem , but I don't
get the whole picture ,yet.
I'm attaching the output of 'journalctl -f | grep -Ev "Started
Session|session opened|session closed"' after I have tried to power on the
hosted engine (hosted-engine --vm-start).
The nodes are fully updated and I don't see anything in the gluster v5.5
logs, but I can double check.
Can you please attach gluster logs fro the same time frame?
Any hints are appreciated and thanks in advance.
Best Regards,
Strahil Nikolov
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8:31 a.m.
Hi Simone,
I am attaching the gluster logs from ovirt1.I hope you see something I missed.
Best Regards,Strahil Nikolov
7:36 a.m.
Hi Simone,
I'm attaching the sanlock.log file from ovirt1.Would you be able to share any thoughts
,as I feel hard to decode that one ?I would be happy to resolve such issues on my own - if
that is possible.
P.S.: Ignore the errors from this morning - I was trying to reinitialize dom_md/ids , but
in the end i had to restore it from the backup.
Best Regards,Strahil Nikolov
В понеделник, 1 април 2019 г., 21:58:04 ч. Гринуич+3, Simone Tiraboschi
<stirabos(a)redhat.com> написа:
Can you please add also /var/log/sanlock.log ?
On Mon, Apr 1, 2019 at 3:42 PM Strahil Nikolov <hunter86_bg(a)yahoo.com> wrote:
Hi Simone,
Sorry, it looks empty.
Sadly it's true. This one should be
OK.
Best Regards,Strahil Nikolov
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4:48 a.m.
Hi Simone,
a short mail chain in gluster-users Amar confirmed my suspicion that Gluster v5.5 is
performing a little bit slower than 3.12.15 .In result the sanlock reservations take too
much time.
I have updated my setup and uncached (used lvm caching in writeback mode) my data bricks
and used the SSD for the engine volume.Now the engine is running quite well and no more
issues were observed.
Can you share any thoughts about oVirt being updated to Gluster v6.x ? I know that there
are any hooks between vdsm and gluster and I'm not sure how vdsm will react on the new
version.
Best Regards,Strahil Nikolov
5:03 a.m.
On Fri, Apr 5, 2019 at 10:48 AM Strahil Nikolov <hunter86_bg(a)yahoo.com>
wrote:
Hi Simone,
a short mail chain in gluster-users Amar confirmed my suspicion that
Gluster v5.5 is performing a little bit slower than 3.12.15 .
In result the sanlock reservations take too much time.
Thanks for the report!
I have updated my setup and uncached (used lvm caching in writeback
mode)
my data bricks and used the SSD for the engine volume.Now the engine is
running quite well and no more issues were observed.
This definitively helps, but for my experience the network speed is really
determinant here.
Can you describe your network configuration?
A 10 Gbps net is definitively fine here.
A few bonded 1 Gbps nics could work.
A single 1 Gbps nic could be an issue.
Can you share any thoughts about oVirt being updated to Gluster v6.x
? I
know that there are any hooks between vdsm and gluster and I'm not sure how
vdsm will react on the new version.
It's definitively planned, see: https://bugzilla.redhat.com/1693998
<https://bugzilla.redhat.com/show_bug.cgi?id=1693998>
I'm not really sure about its time plan.
Best Regards,
Strahil Nikolov
8:17 a.m.
This definitively helps, but for my experience the network speed is
really determinant here.Can you describe your network >configuration?
A 10 Gbps net is definitively fine here.
A few bonded 1 Gbps nics could work.
A single 1 Gbps nic could be an issue.
I have a gigabit interface on my workstations and sadly I have no option for upgrade
without switching the hardware.
I have observed my network traffic for days with iftop and gtop and I have never reached
my Gbit interface's maximum bandwidth, not even the half of it.
Even when reseting my bricks (gluster volume reset-brick) and running a full heal - I do
not observe more than 50GiB/s utilization. I am not sure if FUSE is using network for
accessing the local brick - but I hope that it is not true.
Checking disk performance - everything is in the expected ranges.
I suspect that the Gluster v5 enhancements are increasing both network and IOPS
requirements and my setup was not dealing with it properly.
It's definitively planned,
see: https://bugzilla.redhat.com/1693998>I'm not really sure about its time plan.
I will try to get involved and provide feedback both to oVirt and Gluster dev
teams.
Best Regards,Strahil Nikolov
9:02 a.m.
On Fri, Apr 5, 2019 at 2:18 PM Strahil Nikolov <hunter86_bg(a)yahoo.com>
wrote:
>This definitively helps, but for my experience the network speed
is
really determinant here.Can you describe your network >configuration?
>A 10 Gbps net is definitively fine here.
>A few bonded 1 Gbps nics could work.
>A single 1 Gbps nic could be an issue.
I have a gigabit interface on my workstations and sadly I have no option
for upgrade without switching the hardware.
I have observed my network traffic for days with iftop and gtop and I have
never reached my Gbit interface's maximum bandwidth, not even the half of
it.
Even when reseting my bricks (gluster volume reset-brick) and running a
full heal - I do not observe more than 50GiB/s utilization. I am not sure
if FUSE is using network for accessing the local brick - but I hope that
it is not true.
GlusterFS is a scalable *network* filesystem: the network is always there.
You can use caching technique to read from the local peer first but sooner
or later you will have to compare it with data from other peers or sync the
data to other peers on writes.
According to gluster administration guide:
https://docs.gluster.org/en/latest/Administrator%20Guide/Network%20Config...
in the "when to bond" section we can read:
network throughput limit of client/server \<\< storage throughput limit
1 GbE (almost always)
10-Gbps links or faster -- for writes, replication doubles the load on the
network and replicas are usually on different peers to which the client can
transmit in parallel.
So if you are using oVirt hyper-converged in replica 3 you have to transmit
everything two times over the storage network to sync it with other peers.
I'm not really in that details, but if https://bugzilla.redhat.com/1673058
is really like it's described, we even have an 5x overhead with current
gluster 5.x.
This means that with a 1000 Mbps nic we cannot expect more than:
1000 Mbps / 2 (other replicas) / 5 (overhead in Gluster 5.x ???) / 8 (bit
per bytes) = 12.5 MByte per seconds and this is definitively enough to have
sanlock failing especially because we don't have just the sanlock load as
you can imagine.
I'd strongly advice to move to 10 Gigabit Ethernet (nowadays with a few
hundred dollars you can buy a 4/5 ports 10GBASE-T copper switch plus 3 nics
and the cables just for the gluster network) or to bond a few 1 Gigabit
Ethernet links.
Checking disk performance - everything is in the expected ranges.
I suspect that the Gluster v5 enhancements are increasing both network and
IOPS requirements and my setup was not dealing with it properly.
>It's definitively planned, see: https://bugzilla.redhat.com/1693998
<https://bugzilla.redhat.com/show_bug.cgi?id=1693998>
>I'm not really sure about its time plan.
I will try to get involved and provide feedback both to oVirt and Gluster
dev teams.
Best Regards,
Strahil Nikolov
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