[Linux-cluster] rhcs doubts.

[Allyson - Listas]

Lon Hohberger wrote:

>On Tue, 2006-03-14 at 15:27 -0300, Allyson - Listas wrote:
>  
>
>>Hi guys,
>>
>>I'm new at redhat cluster suite.  Could Anybody help me in some questions?
>>
>>1st) I installed rhcs on 2 virtual machines and create a new cluster, 
>>setup a manual fence, a failvoer domain, create a IP resource and a 
>>service that uses just that IP for tests. Well, I'd like to know how can 
>>I force a failover of the service between nodes. This option is not 
>>available at system-config-cluster that allow just disable and enable 
>>the service.   
>>    
>>
>
>Drag it to the other node in the gui.
>  
>
    -->  I couldn't find this option at gui, but i find how to do it at 
command line..
[root at cs02 /]# clustat
Member Status: Quorate

  Member Name                              Status
  ------ ----                              ------
  cs01.example.com                         Online, rgmanager
  cs02.example.com                         Online, Local, rgmanager

  Service Name         Owner (Last)                   State
  ------- ----         ----- ------                   -----
  vip50                cs02.example.com               started
  oracle-ha-fs         cs02.example.com               started
[root at cs02 /]# clusvcadm -r oracle-ha-fs -m cs01.example.com
Trying to relocate oracle-ha-fs to cs01.example.com...success
[root at cs02 /]# clusvcadm -r vip50 -m cs01.example.com
Trying to relocate vip50 to cs01.example.com...success
[root at cs02 /]# clustat
Member Status: Quorate

  Member Name                              Status
  ------ ----                              ------
  cs01.example.com                         Online, rgmanager
  cs02.example.com                         Online, Local, rgmanager

  Service Name         Owner (Last)                   State
  ------- ----         ----- ------                   -----
  vip50                cs01.example.com               started
  oracle-ha-fs         cs01.example.com               started

>
>  
>
>>I noticed that the ip service created is not a virtual 
>>interface like eth0:1, but it was working because I could ping it, Is it 
>>Normal?
>>    
>>
>
>Yes, try "/sbin/ip addr list", which is noted in the documentation.
>
>
>  
>
tks

>>2nd) What is the real fuction of a fence device?
>>    
>>
>
>Prevent data corruption in the event of a live-hang of a node with
>outstanding dirty buffers.
>
>
>  
>
>>3rd) How can I setup a quorum device, and isn't necessary for a failover 
>>service?  I read that it was needed at rhel3 but at rhel4 is not 
>>anymore, could you explain me that.
>>    
>>
>
>What do you need to know?  It's not needed because of the way CMAN
>recovers - see
>
>http://people.redhat.com/teigland/sca.pdf
>
>-- Lon
>
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>
>  
>


-- 
Allyson A. Brito
MSN: allysonbrito78 at hotmail.com
SKYPE: allysonbrito
RHCE / LPI-1 / SCSA
OCP DBA 9i / OCA PL/SQL 9i