[rrd-users] Re: Could not lock RRD

[Alister Burrell]

Hrm may have misread Alex's post there these 12 hour shifts take their tole
:(

Are there problems accesing rrds over NFS for graphing ? I though it was
just when it was updating as it tries to lock the file so no other process
can mess with it while it's writing to it.

Alister =)

--------------------------
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-----Original Message-----
From: Alister Burrell <aburrell at rim.net>
To: 'yves.caetano at ubizen.com' <yves.caetano at ubizen.com>
Sent: Sun Apr 28 21:39:11 2002
Subject: Re: [rrd-users] Re: Could not lock RRD

Yves,
Think you missed the point let me reclarify for you.  You are having
problems with the update of the rrd so why not run the rrdtool update from
server A rather than running it on server b on the files stored on server A
as you are doing now.  If for some reason you want to keep all the
processing and upadtes on server b why not use rsh or ssh so they are
started from server b but actually run on server a.

Hope this helps a little

Alister =)

--------------------------
Sent from my BlackBerry Wireless Handheld (www.BlackBerry.net)


-----Original Message-----
From: Yves Caetano <yves.caetano at ubizen.com>
To: Alex van den Bogaerdt <alex at slot.hollandcasino.nl>
CC: RRD users <rrd-users at list.ee.ethz.ch>
Sent: Sun Apr 28 21:26:29 2002
Subject: [rrd-users] Re: Could not lock RRD

Dear Alex,

Basicaly the Server A is the nfs server with all the files on it. Server B
is
doing the whole rrd processing. Nothing is done on Server A. I cannot do the
nfs the other way around, cause the data on server A is very big and there
is
no possibility to store this on server B :-(.

Hope you can give me some advise.
thanks

cu ycae

Alex van den Bogaerdt wrote:

> 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
> --
>    __________________________________________________________________
>  / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
> | work                                                         private |
> | My employer is capable of speaking therefore I speak only for myself |
> +----------------------------------------------------------------------+
> | Technical questions sent directly to me will be nuked. Use the list. |
> +----------------------------------------------------------------------+
> | http://faq.mrtg.org/                                                 |
> | http://rrdtool.eu.org  --> tutorial                                  |
> +----------------------------------------------------------------------+

--
Yves Caetano                 Ubizen
Security Analyst             We Secure e-Business
Phone   +352 26 31 58 60     http://www.ubizen.com
Fax     +352 26 31 58 69     http://www.securitywatch.com



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