SUMMARY: Sun Cluster Problem

From: Arunachalam Jayaraman <arjayara_at_in.ibm.com>
Date: Tue Aug 21 2007 - 06:45:47 EDT
Hello Managers,

Thanks very much for your rapid response.   I got replay from Graeme and
Martin. Thanks a lot. I appreciate your time and help.   To summarize!!

Problem Reported:

I am trying to migrate the  two node SUN cluster shared storage from one
EMC  box to another EMC ( New DMX) box.   I prefer to  add new DMX disks
to the existing shared storage disk group and do the veritas level
mirroring volume by volume. Once the mirroring is completed 100%  I will
break the mirror and cut over to new EMC disks.

Here I am worried with the Quorum disk existing in the old EMC disk group.
 Please  advice me how should I move the quorum disk from old EMC disk to
new EMC disks without corrupting cluster configurations

Solution Advised by Sun Managers  Marin and Graeme
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
-------------------------------------------------------

The quorum device doesn't have data on it, it just needs to exist, so you
don't have to do the same mirror/unmirror process as you do with file
system devices.

You have two options:

1. Add a new quorum device from the new array and then delete the one from
the old array.
2. Delete the old, add the new.

Either way you will only have problems if you suffer a failure some time
between the two steps of both options.

You add and remove quorum devices with the scconf -a -q
globaldev={newdevice} or scconf -r -q globaldev={olddevice} commands
(assuming SC 3.1).  Not sure what the SC 3.2 commands are.

Cheers,
Graeme.
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
----------------------------------------------------

I've done such a job from HDS to HDS last month, just add a new quorum
from the new storage and remove the old one...

SC 3.1 -> scsetup -> quorum -> add/del
SC 3.2 -> clsetup -> quorum -> add/del

SC 3.1 -> scconf -a -q globaldev=d<nr>, scconf -r -q globaldev=d<nr>
SC 3.2 -> clquorum add d<nr>, clquorum remove d<nr>

regards
- martin


Thanks and Regards
Arun
Arunachalam Jayaraman, Technical Services Professional - ITD ? Global
Delivery, India
IBM Certified Advanced Technical Expert, Sun Certified System
Administrator & Network Administrator
 +: Block D(EGD-3C-355), Embassy Golf Links, Inner Ring Road, Bangalore -
560071. India. ): T: +91-80-41775627,  (M): 91-9880866774, ::
arjayara@in.ibm.com


----- Forwarded by Arunachalam Jayaraman/India/IBM on 21/08/2007 16:07
-----

Graeme Elsworthy <graeme@unixsm.com.au>
21/08/2007 15:20

To
Arunachalam Jayaraman/India/IBM@IBMIN
cc

Subject
Re: Sun Cluster Problem






Hi Arun,

The quorum device doesn't have data on it, it just needs to exist, so you
don't have to do the same mirror/unmirror process as you do with file
system devices.

You have two options:

1. Add a new quorum device from the new array and then delete the one from
the old array.
2. Delete the old, add the new.

Either way you will only have problems if you suffer a failure some time
between the two steps of both options.

You add and remove quorum devices with the scconf -a -q
globaldev={newdevice} or scconf -r -q globaldev={olddevice} commands
(assuming SC 3.1).  Not sure what the SC 3.2 commands are.

Cheers,
Graeme.



Arunachalam Jayaraman wrote:
Dear  Managers,

I am trying to migrate the  two node SUN cluster shared storage from one
EMC  box to another EMC ( New DMX) box.   I prefer to  add new DMX disks
to the existing shared storage disk group and do the veritas level
mirroring volume by volume. Once the mirroring is completed 100%  I will
break the mirror and cut over to new EMC disks.

Here I am worried with the Quorum disk existing in the old EMC disk group.
 Please  advice me how should I move the quorum disk from old EMC disk to
new EMC disks without corrupting cluster configurations

Command Output  of scstat -pv

------------------------------------------------------------------

-- Quorum Summary --

  Quorum votes possible:      3
  Quorum votes needed:        2
  Quorum votes present:       3


-- Quorum Votes by Node --

                    Node Name           Present Possible Status
                    ---------           ------- -------- ------
  Node votes:       Node-A                      1        1       Online
  Node votes:       Node-B                      1        1       Online


-- Quorum Votes by Device --

                    Device Name         Present Possible Status
                    -----------         ------- -------- ------
  Device votes:     /dev/did/rdsk/d17s2 1        1       Online

------------------------------------------------------------------

Thanks and Regards
Arun
Arunachalam Jayaraman, Technical Services Professional - ITD ? Global
Delivery, India
IBM Certified Advanced Technical Expert, Sun Certified System
Administrator & Network Administrator
 +: Block D(EGD-3C-355), Embassy Golf Links, Inner Ring Road, Bangalore -
560071. India. ): T: +91-80-41775627,  (M): 91-9880866774, ::
arjayara@in.ibm.com

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Received on Tue Aug 21 06:45:43 2007

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