[DRBD-user] testing drbd without real deices

Rupert rupertt at gmail.com
Thu Jul 30 07:23:55 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.


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,

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>>
>
>
>
>     On Mon, Jul 27, 2009 at 2:18 PM, Martin Gombac <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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