[DRBD-user] testing drbd without real deices

Maros Timko timkom at gmail.com
Thu Jul 30 23:29:58 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


No,

I meant:
http://www.gossamer-threads.com/lists/drbd/users/17212
http://www.gossamer-threads.com/lists/drbd/users/17356
http://www.gossamer-threads.com/lists/drbd/users/16962

Tino

2009/7/30 Rupert <rupertt at gmail.com>

> Maros Timko wrote:
>
>> Rupertt,
>>  TOE - TCP Offloading Engine is HW support of network card to improve
>> performance. It is usually enabled by default on your network card.
>> Check "ethtool -k" option and search on this list.
>> Tino
>> 2009/7/30 Rupert <rupertt at gmail.com <mailto:rupertt at gmail.com>>
>>
>>    Maros Timko wrote:
>>
>>        Heiko,
>>        whhich machine crashes? Primary only, both?
>>        I think it is primary but only in case xen VM is running on
>>        top of DRBD. You can prevent crashes by disabling TOE. Or use
>>        DRBD 8.3.2, AFAIK there should be a parameter that should help
>>        in such setups.
>>        Check older posts in this list.
>>         Tino
>>
>> Hello tino,
>
> you mean this post?
>
> http://archives.free.net.ph/message/20071214.134353.11ba93b1.de.html
>
> this is what ethtool show me:
> ethtool -k eth0
> Offload parameters for eth0:
> Cannot get device rx csum settings: Operation not supported
> Cannot get device udp large send offload settings: Operation not supported
> rx-checksumming: off
> tx-checksumming: on
> scatter-gather: on
> tcp segmentation offload: on
> udp fragmentation offload: off
> generic segmentation offload: off
>
> will disabling tx have any affect on traffic over this device?
> there are 3 other VM that use that device, so i hesitate to just change
> this setting.
>
>
> cheers
>
>
> .r
>
>     Hello Tino,
>>
>>    in one case I have a primary on each machine, means 2 drbd devices.
>>    In the other case we have only 1 drbd device, and there only the
>>    primary crashed.
>>    What means TOE, havent found anything about that yet?
>>    Someone on this list suggested that I should use protocol A, but
>>    we dont want to loose
>>    any data, so we cant use that.
>>    I am thinking about updating, but I first have to test if these
>>    packages work with our system,
>>    CentOS 5.x.
>>
>>    so long
>>
>>        2009/7/27 Heiko <rupertt at gmail.com <mailto:rupertt at gmail.com>
>>        <mailto:rupertt at gmail.com <mailto:rupertt at gmail.com>>>
>>
>>
>>
>>
>>           On Mon, Jul 27, 2009 at 2:18 PM, Martin Gombac
>>        <martin at isg.si <mailto:martin at isg.si>
>>            <mailto:martin at isg.si <mailto:martin at isg.si>>> wrote:
>>
>>               In my humble opinion, drbd does't crash if you loose
>>        network
>>               connections. :-)
>>               Would be a first in history.
>>               Maybe heartbeat puts both sources to primary and when they
>>               join you got split brain.
>>               In this case you didn't set up heartbeat correctly.
>>
>>           Hello M.,
>>
>>           i had some people here that confirmed a bug in protocol C that
>>           causes these crashes.
>>           I also thought of heartbeat, but I now have 2 ucast devices
>>        and we
>>           still have crashes and
>>           no entries in the logfile that say it does a reboot on purpose:
>>
>>           only these messages:
>>
>>           heartbeat[2880]: 2009/07/27_11:59:37 ERROR: glib: Unable to
>>        send
>>           [-1] ucast packet: No such device
>>           heartbeat[2880]: 2009/07/27_11:59:37 ERROR: write_child: write
>>           failure on ucast eth0.: No such device
>>
>>
>>
>>
>>           my ha config looks like this
>>
>>           #use_logd on
>>           logfile /var/log/ha-log
>>           debugfile /var/log/ha-debug
>>           logfacility local0
>>           keepalive 2
>>           deadtime 10
>>           warntime 3
>>           initdead 20
>>           udpport 694
>>           ucast eth0 172.17.8.201
>>           ucast eth0 172.17.8.202
>>           ucast eth1 172.31.0.1
>>           ucast eth1 172.31.0.2
>>           node xen-a1.fra1
>>           node xen-b1.fra1
>>           auto_failback on
>>
>>           haresources:
>>
>>           xen-a1.fra1 drbddisk::blrg  xen::blrg-vm1
>>
>>           thnx a lot
>>
>>
>>           .r
>>
>>
>>               Regards,
>>               M.
>>
>>
>>               On 27, Jul2009, at 1:47 PM, Heiko wrote:
>>
>>                   Hello,
>>
>>                   i have to convince my boss that our server crashes i
>>                   reported on this list are due
>>                   to a non exsiting dedicated line! We have all our drbd
>>                   traffic routed through switches
>>                   and they often just crash.
>>
>>                   Now I have to create a test setup to show them that
>>        when I
>>                   plug the corg/shutdown the networkdevice
>>                   the machines tend to crash.
>>                   Since I dont have any spare machines I would like
>>        to use
>>                   loopback devices,
>>                   are these supported by now? I found some list
>>        entries that
>>                   say this is not supported by drbd!
>>                   would this be enough to get the machines crashing?
>>                   We use drbd8.0 and 8.2 and have on both these crashes.
>>
>>
>>                   cheers.
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>>
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>>
>>
>>
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