[Linux-cluster] GFS hangs, nodes die

[Marc Grimme]

Hello Sebastian,
what do gfs_tool counters on the fs tell you?
And ps axf? Do you have a lot of "D" processes?
Regards Marc.
On Sunday 19 August 2007 02:06:30 Sebastian Walter wrote:
> Dear list,
>
> this is the tragical story of my cluster running rhel/csgfs 4u5: the
> cluster in generally is running fine, but when I increase the load to a
> certain level (heavy I/O), it collapses. About 20% of the nodes do crash
> (not reacting any more, but no sign of kernel panic), the others can't
> access the gfs resource.
> Gfs is set up as a rgmanager service with failover domain for each node
> (same problem also exists when mounting via /etc/fstab).
>
> Who is willing to provide a happy end?
>
> Thanks, Sebastian
> **
>
> This is what /var/log/messages gives me (on nearly all nodes):
> Aug 18 04:39:06 compute-0-2 clurgmgrd[4225]: <err> #49: Failed getting
> status for RG gfs-2
> and e.g.
> Aug 18 04:45:38 compute-0-6 clurgmgrd[9074]: <err> #50: Unable to obtain
> cluster lock: Connection timed out
>
> [root at compute-0-3 ~]# cat /proc/cluster/status
> Protocol version: 5.0.1
> Config version: 53
> Cluster name: dtm
> Cluster ID: 741
> Cluster Member: Yes
> Membership state: Cluster-Member
> Nodes: 10
> Expected_votes: 11
> Total_votes: 10
> Quorum: 6
> Active subsystems: 8
> Node name: compute-0-3
> Node ID: 4
> Node addresses: 10.1.255.252
>
> [root at compute-0-6 ~]# cat /proc/cluster/services
> Service          Name                              GID LID State     Code
> Fence Domain:    "default"                           3   2 recover 4 -
> [1 2 6 10 9 8 3 7 4 11]
> DLM Lock Space:  "clvmd"                             7   3 recover 0 -
> [1 2 6 10 9 8 3 7 4 11]
> DLM Lock Space:  "Magma"                            12   5 recover 0 -
> [1 2 6 10 9 8 3 7 4 11]
> DLM Lock Space:  "homeneu"                          17   6 recover 0 -
> [10 9 8 7 2 3 6 4 1 11]
> GFS Mount Group: "homeneu"                          18   7 recover 0 -
> [10 9 8 7 2 3 6 4 1 11]
> User:            "usrm::manager"                    11   4 recover 0 -
> [1 2 6 10 9 8 3 7 4 11]
>
> [root at compute-0-10 ~]# cat /proc/cluster/dlm_stats
> DLM stats (HZ=1000)
>
> Lock operations:       4036
> Unlock operations:     2001
> Convert operations:    1862
> Completion ASTs:       7898
> Blocking ASTs:           52
>
> Lockqueue        num  waittime   ave
> WAIT_RSB        3778     28862     7
> WAIT_CONV         75       482     6
> WAIT_GRANT      2171      7235     3
> WAIT_UNLOCK      153      1606    10
> Total           6177     38185     6
>
> [root at compute-0-10 ~]# cat /proc/cluster/sm_debug
> sevent state 7
> 02000012 sevent state 9
> 00000003 remove node 5 count 10
> 01000011 remove node 5 count 10
> 0100000c remove node 5 count 10
> 01000007 remove node 5 count 10
> 02000012 remove node 5 count 10
> 0300000b remove node 5 count 10
> 00000003 recover state 0
>
>
>
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-- 
Gruss / Regards,

Marc Grimme
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