Am 29.03.2011 15:31, schrieb Dejan Muhamedagic:
> On Tue, Mar 29, 2011 at 08:13:49AM +0200, Christoph Bartoschek wrote:
>> Am 29.03.2011 02:35, schrieb Vadym Chepkov:
>>>
>>> On Mar 28, 2011, at 10:55 AM, Christoph Bartoschek wrote:
>>>
>>>> Am 28.03.2011 16:30, schrieb Dejan Muhamedagic:
>>>>> Hi,
>>>>>
>>>>> On Mon, Mar 21, 2011 at 11:33:49PM +0100, Christoph Bartoschek wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I am testing a NFS failover setup. During the tests I created a
>>>>>> split-brain situation and now node A thinks it is primary and uptodate
>>>>>> while node B thinks that it is Outdated.
>>>>>>
>>>>>> crm_mon however does not indicate any error to me. Why is this the case?
>>>>>> I expect to see anything that shows me the degraded status. How can this
>>>>>> be fixed?
>>>>>
>>>>> The cluster relies on the RA (in this case drbd) to report any
>>>>> problems. Do you have a monitor operation defined for that
>>>>> resource?
>>>>
>>>> I have the resource defined as:
>>>>
>>>> primitive p_drbd ocf:linbit:drbd \
>>>> params drbd_resource="home-data"
>>>> op monitor interval="15" role="Master" \
>>>> op monitor interval="30" role="Slave"
>>>>
>>>> Is this a correct monitor operation?
>
> Yes, though you should also add timeout specs.
>
>>> Just out of curiosity, you do have ms resource defined?
>>>
>>> ms ms_p_drbd p_drbd \
>>> meta master-max="1" master-node-max="1" clone-max="2"
>>> clone-node-max="1" notify="true"
>>>
>>> Because if you do and cluster is not aware of the split-brain, drbd RA has
>>> a serious flaw.
>>>
>>
>> I'm sorry. Yes, the ms resource is also defined.
>
> Well, I'm really confused. You basically say that the drbd disk
> gets into a degraded mode (i.e. it detects split brain), but the
> cluster (pacemaker) never learns about that. Perhaps you should
> open a bugzilla for this and supply hb_report. Though it's
> really hard to believe. It's like basic functionality failing.
What would you expect to see?
Currently I see the following in crm_mon:
Master/Slave Set: ms_drbd_nfs [p_drbd_nfs]
Masters: [ ries ]
Slaves: [ laplace ]
At the same time "cat /proc/drbd" on ries says:
ries:~ # cat /proc/drbd
version: 8.3.9 (api:88/proto:86-95)
srcversion: A67EB2D25C5AFBFF3D8B788
0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r-----
ns:0 nr:0 dw:4 dr:1761 al:1 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:4
And on node laplace it says:
laplace:~ # cat /proc/drbd
version: 8.3.9 (api:88/proto:86-95)
srcversion: A67EB2D25C5AFBFF3D8B788
0: cs:StandAlone ro:Secondary/Unknown ds:Outdated/DUnknown r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:4
Christoph Bartoschek
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