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Re: [Linux-cluster] Cluster environment issue



Hi,
 when your cluster gets broken, most likely the reason is, there is a
network problem (switch restart or multicast traffic is lost for a while)
on the interface where serverX-priv IPs are configured. Having a quorum
disk may help by giving a quorum vote to one of the servers, so it can
fence the others, but the best thing to do is to fix your network and
preferably add a redundant link for the cluster communication to avoid
breakage in the first place

On Mon, 30 May 2011 12:17:07 -0700 (PDT), Srija <swap_project yahoo com>
wrote:
> Hi,
> 
> I am very new to the redhat cluster. Need some help and suggession for
the
> cluster configuration.
> We have sixteen node cluster of 
> 
>             OS : Linux Server release 5.5 (Tikanga)
>             kernel :  2.6.18-194.3.1.el5xen.
> 
> The problem is sometimes the cluster is getting  broken. The solution is
> (still yet)to reboot the 
> sixteen nodes. Otherwise the nodes are not joining
> 
> We are using  clvm and not using any quorum disk. The quorum is by
default.
> 
> When it is getting broken, clustat commands shows  evrything  offline
> except the node from where
> the clustat command executed.  If we execute vgs, lvs command, those
> commands are getting hung.
> 
> Here is at present the clustat report
> -------------------------------------
> 
> [server1]# clustat
> Cluster Status for newcluster @ Mon May 30 14:55:10 2011
> Member Status: Quorate
> 
>  Member Name                      ID   Status
>  ------ ----                      ---- ------
>  server1                          1 Online
>  server2                          2 Online, Local
>  server3                          3 Online
>  server4                          4 Online
>  server5                          5 Online
>  server6                          6 Online
>  server7                          7 Online
>  server8                          8 Online
>  server9                          9 Online
>  server10                         10 Online
>  server11                         11 Online
>  server12                         12 Online
>  server13                         13 Online
>  server14                         14 Online
>  server15                         15 Online
>  server16                         16 Online
> 
> Here the cman_tool status  output  from one server
> --------------------------------------------------
> 
> [server1 ~]# cman_tool status
> Version: 6.2.0
> Config Version: 23
> Cluster Name: newcluster
> Cluster Id: 53322
> Cluster Member: Yes
> Cluster Generation: 11432
> Membership state: Cluster-Member
> Nodes: 16
> Expected votes: 16
> Total votes: 16
> Quorum: 9  
> Active subsystems: 8
> Flags: Dirty 
> Ports Bound: 0 11  
> Node name: server1
> Node ID: 1
> Multicast addresses: xxx.xxx.xxx.xx 
> Node addresses: 192.168.xxx.xx 
> 
> 
> Here is the cluster.conf file.
> ------------------------------
> 
> <?xml version="1.0"?>
> <cluster alias="newcluster" config_version="23" name="newcluster">
> <fence_daemon clean_start="1" post_fail_delay="0" post_join_delay="15"/>
> 
> <clusternodes>
> 
> <clusternode name="server1-priv" nodeid="1" votes="1">
>                  <fence><method name="1">
>                  <device name="ilo-server1r"/></method>
>                  </fence>
> </clusternode>
> 
> <clusternode name="server2-priv" nodeid="3" votes="1">
>         <fence><method name="1">
>         <device name="ilo-server2r"/></method>
>         </fence>
> </clusternode>
> 
> <clusternode name="server3-priv" nodeid="2" votes="1">
>         <fence><method name="1">
>         <device name="ilo-server3r"/></method>
>         </fence>
> </clusternode>
> 
> [ ... sinp .....]
> 
> <clusternode name="server16-priv" nodeid="16" votes="1">
>        <fence><method name="1">
>        <device name="ilo-server16r"/></method>
>        </fence>
> </clusternode>
> 
> </clusternodes>
> <cman/>
> 
> <dlm plock_ownership="1" plock_rate_limit="0"/>
> <gfs_controld plock_rate_limit="0"/>
> 
> <fencedevices>
>         <fencedevice agent="fence_ilo" hostname="server1r" login="Admin"
>         name="ilo-server1r" passwd="xxxxx"/>
>         ..........
>         <fencedevice agent="fence_ilo" hostname="server16r"
login="Admin"
>         name="ilo-server16r" passwd="xxxxx"/>
> </fencedevices>
> <rm>
> <failoverdomains/>
> <resources/>
> </rm></cluster>
> 
> Here is the lvm.conf file
> --------------------------
> 
> devices {
> 
>     dir = "/dev"
>     scan = [ "/dev" ]
>     preferred_names = [ ]
>     filter = [ "r/scsi.*/","r/pci.*/","r/sd.*/","a/.*/" ]
>     cache_dir = "/etc/lvm/cache"
>     cache_file_prefix = ""
>     write_cache_state = 1
>     sysfs_scan = 1
>     md_component_detection = 1
>     md_chunk_alignment = 1
>     data_alignment_detection = 1
>     data_alignment = 0
>     data_alignment_offset_detection = 1
>     ignore_suspended_devices = 0
> }
> 
> log {
> 
>     verbose = 0
>     syslog = 1
>     overwrite = 0
>     level = 0
>     indent = 1
>     command_names = 0
>     prefix = "  "
> }
> 
> backup {
> 
>     backup = 1
>     backup_dir = "/etc/lvm/backup"
>     archive = 1
>     archive_dir = "/etc/lvm/archive"
>     retain_min = 10
>     retain_days = 30
> }
> 
> shell {
> 
>     history_size = 100
> }
> global {
>     library_dir = "/usr/lib64"
>     umask = 077
>     test = 0
>     units = "h"
>     si_unit_consistency = 0
>     activation = 1
>     proc = "/proc"
>     locking_type = 3
>     wait_for_locks = 1
>     fallback_to_clustered_locking = 1
>     fallback_to_local_locking = 1
>     locking_dir = "/var/lock/lvm"
>     prioritise_write_locks = 1
> }
> 
> activation {
>     udev_sync = 1
>     missing_stripe_filler = "error"
>     reserved_stack = 256
>     reserved_memory = 8192
>     process_priority = -18
>     mirror_region_size = 512
>     readahead = "auto"
>     mirror_log_fault_policy = "allocate"
>     mirror_image_fault_policy = "remove"
> }
> dmeventd {
> 
>     mirror_library = "libdevmapper-event-lvm2mirror.so"
>     snapshot_library = "libdevmapper-event-lvm2snapshot.so"
> }
> 
> 
> If you need more  information,  I can provide ...
> 
> Thanks for your help
> Priya
> 
> --
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> https://www.redhat.com/mailman/listinfo/linux-cluster


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