[Linux-cluster] GFS lockups ?

[Janar Kartau]

Hm.. didn't notice it before. Anyway, i didn't notice that dlm was doing
any more job than usually. The most CPU-consuming processes on the alive
nodes was "top" itself (although the load was around 600 because of the
hang Apache procs).

Janar

Shawn Hood wrote:
> See my thread from yesterday.  Same general thing, but the dlm kernel
> threads were eating cycles.
>
> Sent from my iPhone
>
> On Oct 8, 2008, at 7:24 PM, Janar Kartau <janar.kartau at gmail.com> wrote:
>
>> Hi,
>> Recently our three-node webserver cluster started randomly crashing. I
>> never had time to investigate what the problem was, cause i needed to
>> bring them back online again. But it seemed like alla Apache processes
>> just hang (couldn't even kill them).. waiting for something. The only
>> thing that helped, was a reboot for all or couple of the nodes. Anyway,
>> today i encountered this problem at night and i could look into it a
>> little more. I noticed that some of the GFS filesystems were
>> unaccessable (we have 5 of them, mounted on every nide) and of the nodes
>> was completely unaccessable. So i guessed that this half-dead node was
>> holding locks on the filesystems or sth. Did a hard reset on this dead
>> node and all stabilized.
>> Absolutely no cluster/GFS errors in the logs (besides the ones which
>> tell that the half-dead node was leaving the cluster when i reset it).
>> Nodes have CentOS 4.6 installed (2.6.9-67.0.7.ELsmp, dlm-1.0.7-1,
>> GFS-6.1.15-1, cman-1.0.17-0.el4_6.5). We use EMC CX3-10c for GFS storage
>> (over iSCSI) and EMC PowerPath for multipathing. Separate VLAN is used
>> for CMAN/DLM traffic.
>> Please give me ideas how to solve this or atleast some debugging tips as
>> it's happening twice a day now and seems i simply can't help it. :(
>>
>> Janar Kartau
>>
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