[Linux-cluster] Linux-cluster Digest, Vol 73, Issue 7

Fri May 7 18:27:59 UTC 2010

Paul,
I will have to clear the release of my config files through our security folks.  It will take a couple days.  

Thanks for taking an interest.

Dan

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Subject: Linux-cluster Digest, Vol 73, Issue 7

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Today's Topics:

   1. cman not looking at all valid interfaces (Simmons, Dan A)
   2. Re: cman not looking at all valid interfaces (Paul Morgan)
   3. is there a master rgmanager ? (Martin Waite)
   4. Re: gfs rg and journal size (Carlos Maiolino)
   5. Re: Get qdisk to use /dev/mapper/mpathx devices instead of
      /dev/dm-x (Charlie Brady)
   6. Re: gfs rg and journal size (Bob Peterson)

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

Message: 1
Date: Fri, 7 May 2010 00:07:03 +0000
From: "Simmons, Dan A" <jds at techma.com>
To: "'linux-cluster at redhat.com'" <linux-cluster at redhat.com>
Subject: [Linux-cluster] cman not looking at all valid interfaces
Message-ID:
	<78A76986A50E6A4089BD229281D1E2990C0DDB6D at FXMAIL.techma.com>
Content-Type: text/plain; charset="us-ascii"

Hi, 
cman appears to not scan for interfaces correctly on my RHEL 5.3 64bit cluster.  When I change /etc/hosts and /etc/cluster/cluster.conf to use names "mynode1" and "mynode2" cman boots up correctly and I get a good cluster. 

If I change my configuration to use the interfaces named "mynode1-clu" and "mynode2-clu" which are defined in /etc/hosts I get an error:

Cman not started: Can't find local node name in cluster.conf /usr/sbin/cman_tool: aisexec daemon didn't start

However, if I do `hostname mynode1-clu` on the first node and `hostname mynode2-clu` on the second node and then restart cman I get a good cluster.  I think this proves that my -clu interfaces are valid and properly defined in /etc/cluster/cluster.conf.  

This node was created from a disk clone of another cluster.  Are there any cluster files that would retain system name or interface information?  I have triple checked my /etc/hosts, /etc/sysconfig/network /etc/sysconfig/network-scripts/*eth* , /etc/nsswitch.conf, /etc/cluster/cluster.conf and dns files.

Any suggestions would be appreciated.

J.Dan Simmons

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

Message: 2
Date: Thu, 6 May 2010 20:23:01 -0400
From: Paul Morgan <jumanjiman at gmail.com>
To: linux clustering <linux-cluster at redhat.com>
Subject: Re: [Linux-cluster] cman not looking at all valid interfaces
Message-ID:
	<o2u1b6fc7dd1005061723tacb8db80tffcd01ef04cebf71 at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Can you post your configs?

On May 6, 2010 8:16 PM, "Simmons, Dan A" <jds at techma.com> wrote:

Hi,
cman appears to not scan for interfaces correctly on my RHEL 5.3 64bit
cluster.  When I change /etc/hosts and /etc/cluster/cluster.conf to use
names "mynode1" and "mynode2" cman boots up correctly and I get a good
cluster.

If I change my configuration to use the interfaces named "mynode1-clu" and
"mynode2-clu" which are defined in /etc/hosts I get an error:

Cman not started: Can't find local node name in cluster.conf
/usr/sbin/cman_tool: aisexec daemon didn't start

However, if I do `hostname mynode1-clu` on the first node and `hostname
mynode2-clu` on the second node and then restart cman I get a good cluster.
 I think this proves that my -clu interfaces are valid and properly defined
in /etc/cluster/cluster.conf.

This node was created from a disk clone of another cluster.  Are there any
cluster files that would retain system name or interface information?  I
have triple checked my /etc/hosts, /etc/sysconfig/network
/etc/sysconfig/network-scripts/*eth* , /etc/nsswitch.conf,
/etc/cluster/cluster.conf and dns files.

Any suggestions would be appreciated.

J.Dan Simmons

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Message: 3
Date: Fri, 7 May 2010 10:38:47 +0100
From: "Martin Waite" <Martin.Waite at datacash.com>
To: "linux clustering" <linux-cluster at redhat.com>
Subject: [Linux-cluster] is there a master rgmanager ?
Message-ID:
	<A78DB34D00374344A0AB65B6523C05DC05739B92 at marsden.win.datacash.com>
Content-Type: text/plain; charset="us-ascii"

Hi,

Is there a master rgmanager instance that makes decisions for the whole
cluster, or does each rgmanager arrive at exactly the same decision as
all the other instances based on the totally-ordered sequence of cluster
events that update their state machines ?

If there is a master rgmanager instance, is it possible to identify
which node it is running on ?  

regards,

Martin

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Message: 4
Date: Fri, 7 May 2010 10:13:15 -0300
From: Carlos Maiolino <cmaiolino at redhat.com>
To: linux clustering <linux-cluster at redhat.com>
Subject: Re: [Linux-cluster] gfs rg and journal size
Message-ID: <20100507131315.GA2474 at andromeda.usersys.redhat.com>
Content-Type: text/plain; charset=us-ascii

On Thu, May 06, 2010 at 09:21:05AM -0600, Andrew A. Neuschwander wrote:
> Is there a ways to determine to rg size and the journal size and count of a mounted gfs filesystems?
> 
> Thanks,
> -Andrew
> --
> Andrew A. Neuschwander, RHCE
> Manager, Systems Engineer
> Science Compute Services
> College of Forestry and Conservation
> The University of Montana
> http://www.ntsg.umt.edu
> andrew at ntsg.umt.edu - 406.243.6310
> 
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster

I don't remember if there is a tool for it, but if you do not make a gfs FS with different parameters, the default is 128 MB

-- 
---

Best Regards

Carlos Eduardo Maiolino
Red Hat - Global Support Services

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

Message: 5
Date: Fri, 7 May 2010 09:26:38 -0400 (EDT)
From: Charlie Brady <charlieb-linux-cluster at budge.apana.org.au>
To: linux clustering <linux-cluster at redhat.com>
Subject: Re: [Linux-cluster] Get qdisk to use /dev/mapper/mpathx
	devices instead of /dev/dm-x
Message-ID:
	<Pine.LNX.4.64.1005070924180.9013 at e-smith.charlieb.ott.istop.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Wed, 5 May 2010, Celso K. Webber wrote:

> In my experience, I tend no to use the label in qdisk specification, 
> because it leads qdisk to use the first device it encounters containing 
> that label.

Your qdisk label should be unique, and you should be controlling 
visibility of qdisks.

> Another case is when the device is not found at all, this 
> happened to me before.

If that happens, you have a bigger problem than just using the qdisk label 
to identify the qdisk, don't you?

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

Message: 6
Date: Fri, 7 May 2010 09:57:51 -0400 (EDT)
From: Bob Peterson <rpeterso at redhat.com>
To: linux clustering <linux-cluster at redhat.com>
Subject: Re: [Linux-cluster] gfs rg and journal size
Message-ID:
	<569169375.245311273240671353.JavaMail.root at zmail06.collab.prod.int.phx2.redhat.com>

Content-Type: text/plain; charset=utf-8

----- "Andrew A. Neuschwander" <andrew at ntsg.umt.edu> wrote:
| Is there a ways to determine to rg size and the journal size and count
| of a mounted gfs filesystems?
| 
| Thanks,
| -Andrew

In gfs2, there's an easy way:

[root at roth-01 ~]# gfs2_tool journals /mnt/gfs2
journal2 - 128MB
journal1 - 128MB
journal0 - 128MB
3 journal(s) found.

With gfs1, gfs_tool df tells you how many journals but it doesn't tell
you their size, and there's no "journals" option in gfs_tool.
You could use gfs_tool jindex, but the output is cryptic; it prints
out the number of 64K segments, so 2048 corresponds to 128MB,
assuming a default 4K block size.

Regards,

Bob Peterson
Red Hat File Systems

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

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