Re: [Drbd-dev] Problem with DRBD0.7 on Debian Sarge.

[Szymon Madej <szymon.madej@nask.pl>]

Thanks for fast answer.

>>kernel: drbd0: Resync done (total 1 sec; paused 0 sec; 0 K/sec)
>>kernel: drbd1: sock_recvmsg returned -14
>>kernel: drbd1: drbd1_receiver [699]: cstate SyncTarget --> BrokenPipe
>>kernel: drbd1: short read receiving data block: read -14 expected 4096
>>kernel: drbd1: error receiving RSDataReply, l: 4112!
>>    
>>
>
>you probably hit the bug which was fixed in 0.7.12:
> * Fixed a connection flip-flop bug when the two peers used different
>    user provided sizes.
>
>to verify this, first, do "drbdadm disconnect <bad_resource>".
>then "drbdsetup /dev/drbdX show", as well as "cat /proc/partitions",
>on both nodes.  compare the results.
>
>  
>

And this is the second strange thing. The device sizes are identical on
both nodes:
primary_node# cat /proc/partitions
...
   8     8   12048718 sda8
   8     9   12851968 sda9
   8    10    1004031 sda10
 147     0   11917644 drbd0
 147     1   12720896 drbd1

secondary_node# cat /proc/partitions
...
   8     8   12048718 sda8
   8     9   12851968 sda9
   8    10    1004031 sda10
 147     0   11917644 drbd0
 147     1   12720896 drbd1

where drbd0 is built over sda8, drbd1 is built over sda9, sda10 is swap
and sda1-7 are system partitions (/ /usr /home etc.). Is there any
chance that this error could really happen?

And another thing, when secondary went into infinite loop trying to get
drbd1 in sync (every try ended with NetworkError and BrokenPipe) the
drbd1 mounted on primary as /data hanged on listing with "ls -la". The
fast and brutal solution was to disconnect both machines cross link on
eth1 (used by DRBD) and reboot both nodes, and then reconnect them...
but this is not a good  method to get HA cluster back to action, isn't
it? :-)

>the solution is probably to either make sure (using some --size
>parameter if possible) that your devices are of the very same size,
>or upgrade to 0.7.15, which should fix the problem.
>
>  
>
The company I work in, is using Debian stable tree (currently Sarge, but
some mochines are still Woody) very strictly. Packages which are not
from inside this tree are treated as suspicious, and it is required to
do extensive testing. Sarge provides DRBD in version 0.7.10 and of
course testing it never broke so it was considered stable.. untill
yesterday... but change to 0.7.15 is almost imposible :-(

Tha