[Linux-cluster] GFS hangs, nodes die

Sebastian Walter sebastian.walter at fu-berlin.de
Fri Aug 24 10:37:15 UTC 2007

Hi list,

just an update. In my scripts, there is nothing about searching the
whole file system, but I see several "df" processes blocking the system
with 100 % CPU. I will update firmwares now and check for better QLogic
drivers. Thanks!


Marc Grimme wrote:
> On Tuesday 21 August 2007 09:52:32 Sebastian Walter wrote:
>> Hi,
>> Marc Grimme wrote:
>>> Do you also see some messages on the console of the nodes. And the
>>> gfs_tool
>>> counters would help before that problem occures. So let it run sometimes
>>> before to see if locks increase.
>>> What kind of stress tests are you doing? I bet searching the whole
>>> filesystem. What makes me wonder is that the gfs_tool glock_purge does
>>> not work whereas it worked for me with exactly the same problems. Did you
>>> set it _AFTER_ the fs was mounted?
> Sorry I mean after is right and before not ;-( .
> And are you using the latest version of CS/GFS?
> Do you have a lot of memory in your machines 16G or more?
>> That makes me optimistic. I set it after the volume was mounted, so I
>> will give it another try setting it before mounting it. Then I will also
>> mail myself the output of the counters every 10 minuts. Let's see...
> I would be interested in the counters.
> Also add the process list in order to see if how much CPU-Time gfs_scand 
> consumes.
> i.e.
> ps axwwww | sort -k4 -n | tail -10
> Have fun Marc.
>> ...with best thanks
>> Sebastian
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