[DRBD-user] bad side-effect: bug in inactive config stops other resources

Helmut Wollmersdorfer helmut.wollmersdorfer at fixpunkt.de
Thu Jan 24 12:34:53 CET 2013



Am 24.01.2013 um 10:37 schrieb Lars Ellenberg:

> On Thu, Jan 24, 2013 at 10:09:30AM +0100, Helmut Wollmersdorfer wrote:
>>
>>
>> The error-message comes from drbd/user/drbdadm_parser.c ->
>> vcheck_uniq(). It checks if certain keys like resource-name in the
>> config are unique. For some reasons this check seems to be activated
>> via pacemaker/crm -> ocf:linbit:drbd -> monitor(?) -- as far as I
>> understand the code.
>
> Right.
>
> pacemaker monitor for some resource (maybe drbd8_1) was executed,

First it was executed for drbd5_1.

Jan  8 15:29:31 xen11 lrmd: [2403]: info: RA output:  
(xen_drbd5_1:1:monitor:stderr) drbd.d/drbd8_1.res:1: conflicting use  
of resource section 'drbd8_1' ...#012drbd.d/drbd10_1.res:1: resource  
section 'drbd8_1' first used here.

from here

primitive xen_drbd5_1 ocf:linbit:drbd \
     params drbd_resource="drbd5_1" \
     op monitor interval="15s" \
     op start interval="0" timeout="240s" \
     op stop interval="0" timeout="100s"

> but found two definitions of that resource.
> Did not know what to do, was confused, errors out with "generic  
> error".
>
> Pacemaker recovery for "generic error" is -> stop.

It stopped all resources running on node xen11:

Jan  8 15:29:37 xen11 Xen[32084]: INFO: Xen domain www will be stopped  
(timeout: 26s)
Jan  8 15:29:37 xen11 Xen[32089]: INFO: Xen domain mail4 will be  
stopped (timeout: 26s)
Jan  8 15:29:37 xen11 Xen[32086]: INFO: Xen domain typo3 will be  
stopped (timeout: 26s)

www: 	drbd1_1, drbd1_2
mail4: 	drbd8_1 [*], drbd8_2
typo3: 	drbd2_1, drbd2_2

[*] This is the only "suspicious" one.

In my naive point of view I never would expect this behaviour.

BTW: I remember something like a state-transition graph existing for  
DRBD-0.7. Would be nice to have something human (and machine) readable  
to create automated tests, resp. review the current test-coverage.

Helmut Wollmersdorfer
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