[gpfsug-discuss] Local event

[Buterbaugh, Kevin L]

Hi All,

According to the man page for mmaddcallback:

A local
         event triggers a callback only on the node on which the
         event occurred, such as mounting a file system on one of
         the nodes.


We have two GPFS clusters here (well, three if you count our small test cluster).  Cluster one has 8 NSD servers and one client, which is used only for tape backup … i.e. no one logs on to any of the nodes in the cluster.  Files on it are accessed one of three ways:  1) CNFS mount to local computer, 2) SAMBA mount to local computer, 3) GPFS multi-cluster remote mount to cluster two.  On cluster one there is a user callback for softQuotaExceeded that e-mails the user … and that we know works.

Cluster two has two local GPFS filesystems and over 600 clients natively mounting those filesystems (it’s our HPC cluster).  I’m trying to implement a similar callback for softQuotaExceeded events on cluster two as well.  I’ve tested the callback by manually running the (Python) script and passing it in the parameters I want and it works - I get the e-mail.  Then I added it via mmcallback, but only on the GPFS servers.

I did that because I thought that since callbacks work on cluster one with no local access to the GPFS servers that “local” must mean “when an NSD server does a write that puts the user over quota”.  However, on cluster two the callback is not being triggered.  Does this mean that I actually need to install the callback on every node in cluster two?  If so, then how / why are callbacks working on cluster one?

Thanks…

Kevin

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633



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