[Linux-cluster] Re: Linux-cluster Digest, Vol 46, Issue 48
Balaji
balajisundar at midascomm.com
Mon Mar 3 07:18:45 UTC 2008
linux-cluster-request at redhat.com wrote:
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>Today's Topics:
>
> 1. RE: is clvm a must all the time in a cluster ? (Roger Pe?a)
> 2. Re: gfs_tool: Cannot allocate memory (Bob Peterson)
> 3. Ethernet Channel Bonding Configuration in RHEL Cluster Suite
> Setup (Balaji)
> 4. R: [Linux-cluster] Ethernet Channel Bonding Configuration in
> RHELCluster Suite Setup (Leandro Dardini)
> 5. probe a special port and fence according to the result (Peter)
> 6. Re: probe a special port and fence according to the result
> (Lon Hohberger)
> 7. Re: Ethernet Channel Bonding Configuration in RHEL Cluster
> Suite Setup (Lon Hohberger)
> 8. Re: probe a special port and fence according to the result
> (Brian Kroth)
> 9. Re: probe a special port and fence according to the result (Peter)
> 10. Re: Redundant (multipath)/Replicating NFS (isplist at logicore.net)
> 11. Re: Redundant (multipath)/Replicating NFS (gordan at bobich.net)
> 12. Re: Redundant (multipath)/Replicating NFS (isplist at logicore.net)
> 13. Re: gfs_tool: Cannot allocate memory (rhurst at bidmc.harvard.edu)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 28 Feb 2008 22:00:04 -0500 (EST)
>From: Roger Pe?a <orkcu at yahoo.com>
>Subject: RE: [Linux-cluster] is clvm a must all the time in a cluster
> ?
>To: linux clustering <linux-cluster at redhat.com>
>Message-ID: <233538.63310.qm at web50602.mail.re2.yahoo.com>
>Content-Type: text/plain; charset=iso-8859-1
>
>
>--- Roger Peña <orkcu at yahoo.com> wrote:
>
>
>
>>--- Steffen Plotner <swplotner at amherst.edu> wrote:
>>
>>
>>
>>>Hi,
>>>
>>>You asked below: can I run the cluster with GFS
>>>without clvmd? The answer is yes. I believe in
>>>having the least number of components running, and
>>>found that clvmd had start up problems (and then
>>>refuses to stop) after doing an update of RHEL4
>>>during December.
>>>
>>>
>>>
>>I apply those updates this month so I guess I am
>>seeing the same as you
>>
>>
>>
>>>It is clearly possible to use GFS directly on a
>>>
>>>
>>SAN
>>
>>
>>>based LUN.
>>>
>>>
>>I know that but, as you already said, the problem is
>>"having a uniq name for the filesystem to all the
>>nodes"
>>
>>
>>
>>>The trick of course is how to deal with
>>>the /dev/sdb reference which will probably not be
>>>the same on all hosts. To fix that use udev rules
>>>that provide a symlink (using the serial number of
>>>the LUN, for example) by which the GFS file system
>>>can be referred to in /etc/fstab.
>>>
>>>
>>I am sure udev rules works but definitly seting that
>>enviroment is more complex that use a LV :-)
>>so, what happen is I use the shared LV just as a
>>local
>>LV?
>>each node will treated the same way as it treat the
>>LV
>>from the local disks. I guess that will not be a
>>problem as far as I do not work with the VG
>>metadata,
>>am I right?
>>
>>
>>
>>
>>
>>
>>>We have converted 2 clusters in the past few
>>>
>>>
>>months
>>
>>
>>>because we have had real problems with clvmd
>>>misbehaving itself during startup. At this point
>>>
>>>
>>it
>>
>>
>>>is a pleasure to let the cluster boot by itself
>>>
>>>
>>and
>>
>>
>>>not to have to worry about GFS file systems not
>>>being mounted (ccsd, cman, fenced, iscsi, gfs).
>>>
>>>
>>not activating LV even when clvmd is running? it
>>happen to me several times in the last month
>>;-)
>>that is why I want to get rid of lvm :-)
>>
>>
> ^^^
>I mean clvm
>
>sorry, I want to use lvm, but I dont want to use clvm
>all the time, just when, very rarely, need to create
>or resize shared lv
>
>cu
>roger
>
>__________________________________________
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>
>------------------------------
>
>Message: 2
>Date: Thu, 28 Feb 2008 21:03:36 -0600
>From: Bob Peterson <rpeterso at redhat.com>
>Subject: Re: [Linux-cluster] gfs_tool: Cannot allocate memory
>To: linux clustering <linux-cluster at redhat.com>
>Message-ID: <1204254216.3272.15.camel at technetium.msp.redhat.com>
>Content-Type: text/plain
>
>On Thu, 2008-02-28 at 10:28 -0500, rhurst at bidmc.harvard.edu wrote:
>
>
>>ioctl(3, 0x472d, 0x7fbfffe300) = -1 ENOMEM (Cannot allocate
>>
>>
>
>Hi Robert,
>
>The gfs_tool does most of its work using ioctl calls to the gfs kernel
>module. Often, it tries to allocate and pass in a huge buffer to make
>sure it doesn't ask for more than the kernel needs to respond with.
>
>In some cases, it doesn't need to allocate such a big buffer.
>I fixed "gfs_tool counters" for a similar ENOMEM problem with
>bugzilla record 229461 about a year ago. (I don't know if that bug
>record is public or locked so you may not be able to access it, which
>is out of my control--sorry).
>
>I should probably go through all the other gfs_tool functions, including
>the two you mentioned, and figure out their minimum memory requirements
>and change the code so it doesn't ask for so much memory.
>
>Perhaps you can open up a bugzilla record so I can schedule this work?
>Also, you didn't say whether you're on RHEL4/Centos4/similar, or
>RHEL5/Centos5/similar.
>
>Regards,
>
>Bob Peterson
>Red Hat GFS
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Fri, 29 Feb 2008 17:58:00 +0530
>From: Balaji <balajisundar at midascomm.com>
>Subject: [Linux-cluster] Ethernet Channel Bonding Configuration in
> RHEL Cluster Suite Setup
>To: ClusterGrp <linux-cluster at redhat.com>
>Message-ID: <47C7FA50.8080202 at midascomm.com>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Dear All,
>
> I am new in RHEL Cluster Suite.
>
> I have Configure Cluster and Rebooted the system and then cluster
>become active in primary node and other node as passive and member
>status becomes Online for both the cluster nodes
>
> In Cluster Suite i am monitoring the resources as scripts files and
>ipaddress and During network failure one of the node or both the nodes
>are removed from the cluster member and All the resources are stopped
>and then rebooted the system only both the system are joining into the
>cluster member.
>
> I have followed the RHEL Cluster Suite Configuration document
>"rh-cs-en-4.pdf" and I have found out Ethernet Channel Bonding in Each
>Cluster Nodes will avoid the network single point failure in cluster
>system.
>
> I have configured the Ethernet Channel Bonding with mode as
>active-backup without fence device.
>
> Ethernet Channel Bonding Configuration Details are
> 1. In " /etc/modprobe.conf" file added the following bonding driver
>support
> alias bond0 bonding
> options bonding miimon=100 mode=1
> 2. Edited the "/etc/sysconfig/network-scripts/ifcfg-eth0" file added
>the following configuration
> DEVICE=eth0
> USERCTL=no
> ONBOOT=yes
> MASTER=bond0
> SLAVE=yes
> BOOTPROTO=none
> 3. Edited the "/etc/sysconfig/network-scripts/ifcfg-eth1" file added
>the following configuration
> DEVICE=eth1
> USERCTL=no
> ONBOOT=yes
> MASTER=bond0
> SLAVE=yes
> BOOTPROTO=none
> 4. Created a network script for the bonding device
>"/etc/sysconfig/network-scripts/ifcfg-bond0"
> DEVICE=bond0
> USERCTL=no
> ONBOOT=yes
> IPADDR=192.168.13.109
> NETMASK=255.255.255.0
> GATEWAY=192.168.13.1
> 5. Reboot the system for the changes to take effect.
> 6. Configure Ethernet Channel Bonding
> 7. Rebooted the system and then cluster services are active on both
>the nodes and member status of current node is Online and other node as
>Offline
>
> I need clarification about Ethernet Channel Bonding will work with
>Fence Device or not.
>
> I am not sure why this is happening. Can some one throw light on this.
>
>Regards
>-S.Balaji
>
>
>
>
>
>
>
>
>
>
>
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>
>------------------------------
>
>Message: 4
>Date: Fri, 29 Feb 2008 13:51:05 +0100
>From: "Leandro Dardini" <l.dardini at comune.prato.it>
>Subject: R: [Linux-cluster] Ethernet Channel Bonding Configuration in
> RHELCluster Suite Setup
>To: "linux clustering" <linux-cluster at redhat.com>
>Message-ID:
> <6F861500A5092B4C8CD653DE20A4AA0D511B91 at exchange3.comune.prato.local>
>Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
>
>>-----Messaggio originale-----
>>Da: linux-cluster-bounces at redhat.com
>>[mailto:linux-cluster-bounces at redhat.com] Per conto di Balaji
>>Inviato: venerdì 29 febbraio 2008 13.28
>>A: ClusterGrp
>>Oggetto: [Linux-cluster] Ethernet Channel Bonding
>>Configuration in RHELCluster Suite Setup
>>
>>Dear All,
>>
>> I am new in RHEL Cluster Suite.
>>
>> I have Configure Cluster and Rebooted the system and then
>>cluster become active in primary node and other node as
>>passive and member status becomes Online for both the cluster nodes
>>
>> In Cluster Suite i am monitoring the resources as scripts
>>files and ipaddress and During network failure one of the
>>node or both the nodes are removed from the cluster member
>>and All the resources are stopped and then rebooted the
>>system only both the system are joining into the cluster member.
>>
>> I have followed the RHEL Cluster Suite Configuration
>>document "rh-cs-en-4.pdf" and I have found out Ethernet
>>Channel Bonding in Each Cluster Nodes will avoid the network
>>single point failure in cluster system.
>>
>> I have configured the Ethernet Channel Bonding with mode
>>as active-backup without fence device.
>>
>> Ethernet Channel Bonding Configuration Details are
>> 1. In " /etc/modprobe.conf" file added the following
>>bonding driver support
>> alias bond0 bonding
>> options bonding miimon=100 mode=1
>> 2. Edited the "/etc/sysconfig/network-scripts/ifcfg-eth0"
>>file added the following configuration
>> DEVICE=eth0
>> USERCTL=no
>> ONBOOT=yes
>> MASTER=bond0
>> SLAVE=yes
>> BOOTPROTO=none
>> 3. Edited the "/etc/sysconfig/network-scripts/ifcfg-eth1"
>>file added the following configuration
>> DEVICE=eth1
>> USERCTL=no
>> ONBOOT=yes
>> MASTER=bond0
>> SLAVE=yes
>> BOOTPROTO=none
>> 4. Created a network script for the bonding device
>>"/etc/sysconfig/network-scripts/ifcfg-bond0"
>> DEVICE=bond0
>> USERCTL=no
>> ONBOOT=yes
>> IPADDR=192.168.13.109
>> NETMASK=255.255.255.0
>> GATEWAY=192.168.13.1
>> 5. Reboot the system for the changes to take effect.
>> 6. Configure Ethernet Channel Bonding
>> 7. Rebooted the system and then cluster services are
>>active on both the nodes and member status of current node is
>>Online and other node as Offline
>>
>> I need clarification about Ethernet Channel Bonding will
>>work with Fence Device or not.
>>
>> I am not sure why this is happening. Can some one throw
>>light on this.
>>
>>Regards
>>-S.Balaji
>>
>>
>>
>
>When there is a network failure, each member cannot reach the other one. Each member trigger the fence script to turn off the other one. Unfortunately the network is off, so the low level network interface take the fence script connection request in mind and wait for the network to come up. When the network is again available, each member can reach the fencing device and turn off the other. There is no simple way to avoid this. You can make network near 100% fault proof using bond device or you can use a STONITH fencing device, so the first member who regain network prevents the other to fence, or you can use three members. In a network failure no one have the quorum to fence the others.
>
>Leandro
>
>
>
>------------------------------
>
>Message: 5
>Date: Fri, 29 Feb 2008 15:05:23 +0100
>From: Peter <p.elmers at gmx.de>
>Subject: [Linux-cluster] probe a special port and fence according to
> the result
>To: linux clustering <linux-cluster at redhat.com>
>Message-ID: <99FC135E-6367-41B5-B6B5-AA1FEC5D9833 at gmx.de>
>Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
>Hi!
>
>I am planning to test a service for availability and if the service is
>not available anymore, fence the node and start the service on another
>node. Therefore, i need a clue how to probe a port with system tools.
>Sure, with telnet there is a possibility to check. But i have no idea
>to avoid the interactivity. So it is too difficult for me to implement
>and usually not allowed in this environment.
>
>On Solaris, there is the "ping -p" command to test the availability of
>a application waiting on a port. But for Redhat, i have no clue.
>
>Could you please help?
>
>
>Peter
>
>
>
>------------------------------
>
>Message: 6
>Date: Fri, 29 Feb 2008 09:20:23 -0500
>From: Lon Hohberger <lhh at redhat.com>
>Subject: Re: [Linux-cluster] probe a special port and fence according
> to the result
>To: linux clustering <linux-cluster at redhat.com>
>Message-ID: <20080229142023.GD6571 at redhat.com>
>Content-Type: text/plain; charset=us-ascii
>
>On Fri, Feb 29, 2008 at 03:05:23PM +0100, Peter wrote:
>
>
>>Hi!
>>
>>I am planning to test a service for availability and if the service is not
>>available anymore, fence the node and start the service on another node.
>>Therefore, i need a clue how to probe a port with system tools.
>>Sure, with telnet there is a possibility to check. But i have no idea to
>>avoid the interactivity. So it is too difficult for me to implement and
>>usually not allowed in this environment.
>>
>>On Solaris, there is the "ping -p" command to test the availability of a
>>application waiting on a port. But for Redhat, i have no clue.
>>
>>Could you please help?
>>
>>
>
>Net Cat? (man nc ) ?
>
>
>
Dear All,
Ping is working but the members are not in cluster and its forming a new
cluster at both the nodes
The following Messages are logged in "/var/log/messages"
CMAN: forming a new cluster
CMAN: quorum regained, resuming activity
Regards
-S.Balaji
then cluster services are active on both
the nodes and member status of current node is Online and other node as
Offline
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