| Interface and switch should have the same MTU and that should not cause any issues (setting switch MTU higher is always safe, though). Aren’t you encapsulating the mon communication in some SDN like openwswitch? Is that a straight L2 connection?
I think this is worth investigating. For example are mons properly setting TCP_NODELAY on the sockets that are latency sensitive? (I just tried finding out and lsof/netstat doesn’t report that to me, I’d need to restart and strace it… I vaguely remember there was an issue with NODELAY that was fixed on OSD side.)
Jan
Seems to be something to do with our switch.
If the interface MTU is too close to the switch MTU it stops working. Thanks
for all your help :)
Cameron Scrace
Infrastructure Engineer
Mobile +64 22 610 4629
Phone +64 4 462 5085
Email cameron.scrace@xxxxxxxxxxxx
Solnet Solutions Limited
Level 12, Solnet House
70 The Terrace, Wellington 6011
PO Box 397, Wellington 6140
www.solnet.co.nz
From:
Somnath Roy <Somnath.Roy@xxxxxxxxxxx>
To:
"Cameron.Scrace@xxxxxxxxxxxx"
<Cameron.Scrace@xxxxxxxxxxxx>
Cc:
"ceph-users@xxxxxxxxxxxxxx"
<ceph-users@xxxxxxxxxxxxxx>, ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx>,
Joao Eduardo Luis <joao@xxxxxxx>
Date:
03/06/2015 11:49 a.m.
Subject:
RE:
Monitors not reaching quorum. (SELinux off, IPtables off, can see tcp traffic)
I doubt it is anything to
do with Ceph, hope you checked your switch is supporting Jumbo frames and
you have set MTU 9000 to all the devices in between. It‘s better to ping
your devices (all the devices participating in the cluster) like the way
it mentioned in the following articles , just in case you are not sure.
http://www.mylesgray.com/hardware/test-jumbo-frames-working/
http://serverfault.com/questions/234311/testing-whether-jumbo-frames-are-actually-working
Hope this helps,
Thanks & Regards
Somnath
From: Cameron.Scrace@xxxxxxxxxxxx
[mailto:Cameron.Scrace@xxxxxxxxxxxx]
Sent: Tuesday, June 02, 2015 4:32 PM
To: Somnath Roy
Cc: ceph-users@xxxxxxxxxxxxxx; ceph-users; Joao Eduardo Luis
Subject: RE: Monitors not reaching quorum. (SELinux off,
IPtables off, can see tcp traffic)
Setting the MTU to 1500 worked, monitors
reach quorum right away. Unfortunately we really want Jumbo Frames to be
on, any ideas on how to get ceph to work with them on?
Thanks!
Cameron Scrace
Infrastructure Engineer
Mobile +64 22 610 4629
Phone +64 4 462 5085
Email cameron.scrace@xxxxxxxxxxxx
Solnet Solutions Limited
Level 12, Solnet House
70 The Terrace, Wellington 6011
PO Box 397, Wellington 6140
www.solnet.co.nz
From: Somnath
Roy <Somnath.Roy@xxxxxxxxxxx>
To: "Cameron.Scrace@xxxxxxxxxxxx"
<Cameron.Scrace@xxxxxxxxxxxx>
Cc: "ceph-users@xxxxxxxxxxxxxx"
<ceph-users@xxxxxxxxxxxxxx>,
ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx>,
Joao Eduardo Luis <joao@xxxxxxx>
Date: 03/06/2015
10:34 a.m.
Subject: RE:
Monitors not reaching quorum. (SELinux off, IPtables off,
can see tcp traffic)
We have seen some communication issue with that, try to make all the server
MTU 1500 and try out…
From: Cameron.Scrace@xxxxxxxxxxxx
[mailto:Cameron.Scrace@xxxxxxxxxxxx]
Sent: Tuesday, June 02, 2015 3:31 PM
To: Somnath Roy
Cc: ceph-users@xxxxxxxxxxxxxx;
ceph-users; Joao Eduardo Luis
Subject: Re: Monitors not reaching quorum. (SELinux off,
IPtables off, can see tcp traffic)
We are running with Jumbo Frames turned on. Is that likely to be the issue?
Do I need to configure something in ceph?
The mon maps are fine and after setting debug to 10 and debug ms to 1,
I see probe timeouts in the logs: http://pastebin.com/44M1uJZc
I just set probe timeout to 10 (up from 2) and it still times out.
Thanks!
Cameron Scrace
Infrastructure Engineer
Mobile +64 22 610 4629
Phone +64 4 462 5085
Email cameron.scrace@xxxxxxxxxxxx
Solnet Solutions Limited
Level 12, Solnet House
70 The Terrace, Wellington 6011
PO Box 397, Wellington 6140
www.solnet.co.nz
From: Somnath
Roy <Somnath.Roy@xxxxxxxxxxx>
To: Joao Eduardo
Luis <joao@xxxxxxx>,
"ceph-users@xxxxxxxxxxxxxx"
<ceph-users@xxxxxxxxxxxxxx>
Date: 03/06/2015
03:49 a.m.
Subject: Re:
Monitors not reaching quorum. (SELinux off, IPtables off,
can see tcp traffic)
Sent by: "ceph-users"
<ceph-users-bounces@xxxxxxxxxxxxxx>
By any chance are you running with jumbo frame turned on ?
Thanks & Regards
Somnath
-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx]
On Behalf Of Joao Eduardo Luis
Sent: Tuesday, June 02, 2015 12:52 AM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Re: Monitors not reaching quorum. (SELinux off, IPtables
off, can see tcp traffic)
On 06/02/2015 01:42 AM, Cameron.Scrace@xxxxxxxxxxxx
wrote:
> I am trying to deploy a new ceph cluster and my monitors are not
> reaching quorum. SELinux is off, firewalls are off, I can see traffic
> between the nodes on port 6789 but when I use the admin socket to
> force a re-election only the monitor I send the request to shows the
> new election in its logs. My logs are filled entirely of the following
> two
> lines:
>
> 2015-06-02 11:31:56.447975 7f795b17a700 0 log_channel(audit)
log
> [DBG]
> : from='admin socket' entity='admin socket' cmd='mon_status' args=[]:
> dispatch
> 2015-06-02 11:31:56.448272 7f795b17a700 0 log_channel(audit)
log
> [DBG]
> : from='admin socket' entity='admin socket' cmd=mon_status args=[]:
> finished
You are running on default debug levels, so you'll hardly get anything
more than that. I suggest setting 'debug mon = 10' and 'debug ms
= 1'
for added verbosity and come back to us with the logs.
There are many reasons for this, but the more common are due to the monitors
not being able to communicate with each other. Given you see traffic
between the monitors, I'm inclined to assume that the other two monitors
do not have each other on the monmap or, if they do know each other, either
1) the monitor's auth keys do not match, or 2) the probe timeout is being
triggered before they successfully manage to find enough monitors to trigger
an election -- which may be due to latency.
Logs will tells us more.
-Joao
> Querying the admin socket with mon_status (the other two are the
> similar but with their hostnames and rank):
>
> {
> "name": "wcm1",
> "rank": 0,
> "state": "probing",
> "election_epoch": 1,
> "quorum": [],
> "outside_quorum": [
> "wcm1"
> ],
> "extra_probe_peers": [],
> "sync_provider": [],
> "monmap": {
> "epoch": 0,
> "fsid": "adb8c500-122e-49fd-9c1e-a99af7832307",
> "modified": "2015-06-02
10:43:41.467811",
> "created": "2015-06-02
10:43:41.467811",
> "mons": [
> {
> "rank":
0,
> "name":
"wcm1",
> "addr":
"10.1.226.64:6789\/0"
> },
> {
> "rank":
1,
> "name":
"wcm2",
> "addr":
"10.1.226.65:6789\/0"
> },
> {
> "rank":
2,
> "name":
"wcm3",
> "addr":
"10.1.226.66:6789\/0"
> }
> ]
> }
> }
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