[rrd-users] Re: Could not lock RRD

[Alex van den Bogaerdt]

Yves Caetano wrote:

> i have a small problem with the rrdtool.....or may be a bigger problem.
> when trying to update the rrd file, i get an error message "Could not
> lock RRD". I read some messages in the mailinglist that there are
> problems running the rrdtool over nfs.

Indeed there are.  The problem is that locking over nfs cannot be
done in a reliable way.

> The rrd files are on a file server, and a processing server is connected
> to this file server through nfs to get the rrd files to process.

Let's give the two servers a name: A and B.

What I think you said is:
- on server A you have your RRD files
- on server A you run "rrdtool update"
- server B has mounted some of the disk of server A
- on server B you run "rrdtool graph" and receive an error

What probably works for you is to nfs mount the other way around; let
server A access server B.  Then you can start "rrdtool graph" on server
A and still write the images directly to server B

HTH
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