Re: [Linux-cluster] How to take down a CS/GFS setup with minimum downtime

[Gary Romo <garromo us ibm com>]

If exactly half or more of the expected
votes disappear, a quorum no longer exists (except in the two-node special
case).

The voting values cam be seen with a


# cman_tool status

If there is quorum, and exit code of
0 (zero) should be returned to the shell wht the clustat -Q command (which
produces no output) is run;

# clustat -Q
# echo $?

Gary Romo
IBM Global Technology Services
303.458.4415
Email: garromo us ibm com
Pager:1.877.552.9264
Text message: gromo skytel com

Sævaldur Arnar Gunnarsson <addi hugsmidjan is>
Sent by: linux-cluster-bounces redhat com

10/26/2007 09:29 AM

Please respond to
linux clustering <linux-cluster redhat com>

To	linux-cluster redhat com
cc
Subject	[Linux-cluster] How to take down a CS/GFS setup with minimum        downtime

I've got five RHEL4 systems with CS and about 800
GB of data on a shared
GFS filesystem.
I've been tasked to take down the cluster and divide the content of the
shared GFS filesystem to the local disks on each system with minimum
downtime.

I've removed two nodes from the cluster already and am somewhat scared
of a quorum problem if I remove another node.

>From what I've been able to gather I should use cman_tool leave remove
on a node once it is ready to leave the cluster and thus be able to
remove four nodes from a five node cluster without disolving the quorum
or risking losing access to the GFS data on the last remaining node.

Is that correct ?

With best regards,
-- 
Saevaldur Arnar Gunnarsson
System Administrator | RHCE

Hugsmidjan ehf.
Snorrabraut 56 | 105 Reykjavik
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