[Linux-cluster] Trouble setting up a new cluster

[Todd Merritt]

And after several reboots, it's all online:

[root at uaz-so-w52 ~]# clustat
Cluster Status for SOA @ Fri Aug 27 12:21:09 2010
Member Status: Quorate

 Member Name                             ID   Status
 ------ ----                             ---- ------
 uaz-so-w52.mosaic.arizona.edu               1 Online, Local
 uaz-so-w51.mosaic.arizona.edu               2 Online
 /dev/mapper/soap1                           0 Online, Quorum Disk


I've seen it show up all as online before briefly and then go offline.
Any ideas what could cause this erratic behavior ?

Todd

On 08/27/2010 09:16 AM, Todd Merritt wrote:
> On 08/27/2010 08:46 AM, Jason_Henderson at Mitel.com wrote:
>> linux-cluster-bounces at redhat.com wrote on 08/27/2010 11:28:27 AM:
>>
>>> I'm trying unsuccessfully to set up a new cluster on redhat 5.  The
>>> nodes seem to see each other, but they alway start up inquorate and
>>> never join up.  I'm not sure what else I should be looking at.  Iptables
>>> is not running.
>>>
>>> [root at uaz-so-w52 ~]# group_tool
>>> type             level name       id       state
>>> fence            0     default    00010001 none
>>> [1]
>>> dlm              1     clvmd      00020001 none
>>> [1]
>>> dlm              1     rgmanager  00030001 none
>>> [1]
>>>
>>> [root at uaz-so-w51 ~]# group_tool
>>> type             level name  id       state
>>>
>>> [root at uaz-so-w51 ~]# cman_tool nodes
>>> Node  Sts   Inc   Joined               Name
>>>    0   X      0                        /dev/mapper/soap1
>>>    1   X      0                        uaz-so-w52.mosaic.arizona.edu
>>>    2   M   7920   2010-08-26 10:04:51  uaz-so-w51.mosaic.arizona.edu
>>>
>>> [root at uaz-so-w52 ~]# cman_tool nodes
>>> Node  Sts   Inc   Joined               Name
>>>    0   M      0   2010-08-26 09:59:16  /dev/mapper/soap1
>>>    1   M   7436   2010-08-26 09:59:04  uaz-so-w52.mosaic.arizona.edu
>>>    2   X      0                        uaz-so-w51.mosaic.arizona.edu
>>>
>>> Any help would be greatly appreciated.
>>
>> Looks like they are each a member of their own cluster. Perhaps multicast 
>> communication between the two nodes is not working. Are you using RedHat 
>> 5.5?
>>
> Yes, it's rh 5.5.  And multicast not working is the track I've been
> running down.  Our network team tells me multicast is enabled within the
> switch.  I had used ssmping to test multicast and it seemed to be
> working.  I just ran it (ssmping) again, and if I start ssmpingd on node
> 1 and run ssmping from node 2 it works fine.  If I start ssmpingd from
> node 2 and run ssmping from node 1 I get connection refused errors from
> ssmping.
> 
> Thanks,
> Todd
> 
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