Re: Time Drift Issues
by Gianluca Cecchi
On Wed, Sep 8, 2021 at 1:19 PM Nur Imam Febrianto <nur_imam(a)outlook.com>
wrote:
> Hi Marcos,
>
>
>
> Want to clarify one thing. If I’m using and oVirt Node based host (not EL
> Linux Based), does it already configured with ntp client or can I just
> configure any ntp client on the host ? If I just configure ntp client on
> the host either chronyc or ntpd, will it persist after upgrading the node ?
>
>
>
> Thanks before.
>
>
>
> Regards,
>
> Nur Imam Febrianto
>
>
>
>
Just to clarify: when using oVirt node 4.4, during installation you have
the usual way to configure ntp inside anaconda. In 4.4, based on CentOS
(stream) 8, when done that way it will configure chronyd.
In the recent past there was a bug where sometimes installation crashed
when configuring ntp in certain conditions.
If you don't configure ntp at install time you can configure it later by
modifying /etc/chrony.conf and starting/enabling the service from the
cockpit web interface (or command line with usual commands). It will remain
across reboots and/or image updates.
HIH,
Gianluca
3 years
Re: Poor gluster performances over 10Gbps network
by Mathieu Valois
Hi Paul,
thank you for your answer.
Indeed I did a `dd` inside a VM to measure the Gluster disk performance.
I've also tried `dd` on an hypervisor writing into one of the replicated
gluster bricks, which gives good performances (similar to logical volume
ones).
Le 08/09/2021 à 12:51, Staniforth, Paul a écrit :
>
> Hi Mathieu,
> How are you measuring the Gluster disk performance?
> also using dd you should use the
> oflag=dsync
>
> to avoid buffer caching.
>
>
> Regards,
>
> Paul S
> ------------------------------------------------------------------------
> *From:* Mathieu Valois <mvalois(a)teicee.com>
> *Sent:* 08 September 2021 10:12
> *To:* users <users(a)ovirt.org>
> *Subject:* [ovirt-users] Poor gluster performances over 10Gbps network
>
> *Caution External Mail:* Do not click any links or open any
> attachments unless you trust the sender and know that the content is safe.
>
> Sorry for double post but I don't know if this mail has been received.
>
> Hello everyone,
>
> I know this issue was already treated on this mailing list. However
> none of the proposed solutions is satisfying me.
>
> Here is my situation : I've got 3 hyperconverged gluster ovirt nodes,
> with 6 network interfaces, bounded in bunches of 2 (management, VMs
> and gluster). The gluster network is on a dedicated bound where the 2
> interfaces are directly connected to the 2 other ovirt nodes. Gluster
> is apparently using it :
>
> # gluster volume status vmstore
> Status of volume: vmstore
> Gluster process TCP Port RDMA Port
> Online Pid
> ------------------------------------------------------------------------------
> Brick gluster-ov1:/gluster_bricks
> /vmstore/vmstore 49152 0
> Y 3019
> Brick gluster-ov2:/gluster_bricks
> /vmstore/vmstore 49152 0
> Y 3009
> Brick gluster-ov3:/gluster_bricks
> /vmstore/vmstore
>
> where 'gluster-ov{1,2,3}' are domain names referencing nodes in the
> gluster network. This networks has 10Gbps capabilities :
>
> # iperf3 -c gluster-ov3
> Connecting to host gluster-ov3, port 5201
> [ 5] local 10.20.0.50 port 46220 connected to 10.20.0.51 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 1.16 GBytes 9.92 Gbits/sec 17 900 KBytes
> [ 5] 1.00-2.00 sec 1.15 GBytes 9.90 Gbits/sec 0 900 KBytes
> [ 5] 2.00-3.00 sec 1.15 GBytes 9.90 Gbits/sec 4 996 KBytes
> [ 5] 3.00-4.00 sec 1.15 GBytes 9.90 Gbits/sec 1 996 KBytes
> [ 5] 4.00-5.00 sec 1.15 GBytes 9.89 Gbits/sec 0 996 KBytes
> [ 5] 5.00-6.00 sec 1.15 GBytes 9.90 Gbits/sec 0 996 KBytes
> [ 5] 6.00-7.00 sec 1.15 GBytes 9.90 Gbits/sec 0 996 KBytes
> [ 5] 7.00-8.00 sec 1.15 GBytes 9.91 Gbits/sec 0 996 KBytes
> [ 5] 8.00-9.00 sec 1.15 GBytes 9.90 Gbits/sec 0 996 KBytes
> [ 5] 9.00-10.00 sec 1.15 GBytes 9.90 Gbits/sec 0 996 KBytes
> - - - - - - - - - - - - - - - - - - - - - - - - -
> [ ID] Interval Transfer Bitrate Retr
> [ 5] 0.00-10.00 sec 11.5 GBytes 9.90 Gbits/sec
> 22 sender
> [ 5] 0.00-10.04 sec 11.5 GBytes 9.86
> Gbits/sec receiver
>
> iperf Done.
>
> However, VMs stored on the vmstore gluster volume has poor write
> performances, oscillating between 100KBps and 30MBps. I almost always
> observe a write spike (180Mbps) at the beginning until around 500MB
> written, then it drastically falls at 10MBps, sometimes even less
> (100KBps). Hypervisors have 32 threads (2 sockets, 8 cores per socket,
> 2 threads per core).
>
> Here is the volume settings :
>
> Volume Name: vmstore
> Type: Replicate
> Volume ID: XXX
> Status: Started
> Snapshot Count: 0
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: gluster-ov1:/gluster_bricks/vmstore/vmstore
> Brick2: gluster-ov2:/gluster_bricks/vmstore/vmstore
> Brick3: gluster-ov3:/gluster_bricks/vmstore/vmstore
> Options Reconfigured:
> performance.io-thread-count: 32 # was 16 by default.
> cluster.granular-entry-heal: enable
> storage.owner-gid: 36
> storage.owner-uid: 36
> cluster.lookup-optimize: off
> server.keepalive-count: 5
> server.keepalive-interval: 2
> server.keepalive-time: 10
> server.tcp-user-timeout: 20
> network.ping-timeout: 30
> server.event-threads: 4
> client.event-threads: 8 # was 4 by default
> cluster.choose-local: off
> features.shard: on
> cluster.shd-wait-qlength: 10000
> cluster.shd-max-threads: 8
> cluster.locking-scheme: granular
> cluster.data-self-heal-algorithm: full
> cluster.server-quorum-type: server
> cluster.quorum-type: auto
> cluster.eager-lock: enable
> performance.strict-o-direct: on
> network.remote-dio: off
> performance.low-prio-threads: 32
> performance.io-cache: off
> performance.read-ahead: off
> performance.quick-read: off
> auth.allow: *
> user.cifs: off
> storage.fips-mode-rchecksum: on
> transport.address-family: inet
> nfs.disable: on
> performance.client-io-threads: on
>
> When I naively write directly on the logical volume, which is mounted
> on a material RAID5 3-disks array, I have interesting performances:
>
> # dd if=/dev/zero of=a bs=4M count=2048
> 2048+0 records in
> 2048+0 records out
> 8589934592 bytes (8.6 GB, 8.0 GiB) copied, 17.2485 s, 498 MB/s
> #urandom gives around 200MBps
>
> Moreover, hypervisors have SSD which have been configured as lvcache,
> but I'm unsure how to test it efficiently.
>
> I can't find where is the problem, as every piece of the chain is
> apparently doing well ...
>
> Thanks anyone for helping me :)
>
> --
> téïcée
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.tei...>
> *Mathieu Valois*
>
> Bureau Caen: Quartier Kœnig - 153, rue Géraldine MOCK - 14760
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3 years
Re: Time Drift Issues
by Nur Imam Febrianto
Hi Marcos,
Want to clarify one thing. If I’m using and oVirt Node based host (not EL Linux Based), does it already configured with ntp client or can I just configure any ntp client on the host ? If I just configure ntp client on the host either chronyc or ntpd, will it persist after upgrading the node ?
Thanks before.
Regards,
Nur Imam Febrianto
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
From: Marcos Sungaila<mailto:marcos.sungaila@oracle.com>
Sent: Tuesday, 07 September 2021 20:54
To: Nur Imam Febrianto<mailto:nur_imam@outlook.com>; oVirt Users<mailto:users@ovirt.org>
Subject: RE: Time Drift Issues
Hi Nur,
ntpd has a 300sec limit for synchronization. If you want a more flexible NTP client, use chronyd.
If you prefer to use ntpd, you should have ntpdate as a boot client and ntpd as a runtime client.
When the server boots, the ntpdate client will sync time no matter the difference. As a boot client, it runs only once and exits. Then the ntpd service starts, and keep your server clock in sync with an external source.
On distributions like CentOS and similar, ntpdate reads the external time sources configuration from ntpd.conf. You should need booth packages and services installed and enabled:
I prefer chronyd since it does not need any extra service or procedure to keep clock synchronization.
Regards,
Marcos
From: Nur Imam Febrianto <nur_imam(a)outlook.com>
Sent: terça-feira, 7 de setembro de 2021 01:08
To: oVirt Users <users(a)ovirt.org>
Subject: [External] : [ovirt-users] Time Drift Issues
Hi All,
Recently I got an warning in our cluster about time drift :
Host xxxxx has time-drift of 672 seconds while maximum configured value is 300 seconds.
What should I do to address this issue ? Should I reconfigure / configure ntp client on all host ?
Thanks before.
Regards,
Nur Imam Febrianto
Sent from Mail<https://apac01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldef...> for Windows
3 years
mom-vdsm doesn't restart after upgrade
by Nathanaël Blanchet
Hello,
I performed a host upgrade from 4.4.5 to 4.4.8, and vdsmd failed to
launch with this log:
Sep 07 16:16:52 kamen systemd[1]: mom-vdsm.service: Job
mom-vdsm.service/start failed with result 'dependency'.
Sep 07 16:16:54 kamen systemd[1]: Dependency failed for MOM instance
configured for VDSM purposes.
Following this ticket
https://bugzilla.redhat.com/show_bug.cgi?id=1557735, I managed to launch
mom-vdsm and so vdsmd doing:
vdsm-tool configure
--
Nathanaël Blanchet
Supervision réseau
SIRE
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet(a)abes.fr
3 years
GlusterFS Monitoring/Alerting
by simon＠justconnect.ie
Hi All,
Does anyone have recommendations for GlusterFS monitoring/alerting software and or plugins.
Kind regards
Simon...
3 years
Re: Time Drift Issues
by Marcos Sungaila
Hi Nur,
ntpd has a 300sec limit for synchronization. If you want a more flexible NTP client, use chronyd.
If you prefer to use ntpd, you should have ntpdate as a boot client and ntpd as a runtime client.
When the server boots, the ntpdate client will sync time no matter the difference. As a boot client, it runs only once and exits. Then the ntpd service starts, and keep your server clock in sync with an external source.
On distributions like CentOS and similar, ntpdate reads the external time sources configuration from ntpd.conf. You should need booth packages and services installed and enabled:
I prefer chronyd since it does not need any extra service or procedure to keep clock synchronization.
Regards,
Marcos
From: Nur Imam Febrianto <nur_imam(a)outlook.com>
Sent: terça-feira, 7 de setembro de 2021 01:08
To: oVirt Users <users(a)ovirt.org>
Subject: [External] : [ovirt-users] Time Drift Issues
Hi All,
Recently I got an warning in our cluster about time drift :
Host xxxxx has time-drift of 672 seconds while maximum configured value is 300 seconds.
What should I do to address this issue ? Should I reconfigure / configure ntp client on all host ?
Thanks before.
Regards,
Nur Imam Febrianto
Sent from Mail<https://urldefense.com/v3/__https:/go.microsoft.com/fwlink/?LinkId=550986...> for Windows
3 years
Re: Time Drift Issues
by dhanaraj.ramesh＠yahoo.com
change the host and engine time to local Time zone and ensure NTP client pointed to same NTP server
3 years
Hostedengine Database broken
by marcel＠deheureu.se
Hi ovirt list,
in our test system is the engine crashed and the database is broken. Of cause it was a test system which has no database backup but there are three importent VMs there.
Our Plan is to deploy a new hosted engine and connect it to the old datacenter and glusterfs.
if i am remember right, the vms will be stopped but we will not lose them. So if i connect the existing data center and click of one VM he will ask me to import it right?
Or did you have an better idea?
Br
Marcel
3 years
