[hobbit] Moving to new Hobbit server

[Hubbard, Greg L]

I am no RRD expert, but it must be storing data in binary format.  I
believe the x86 and SPARC processors store integer values differently --
one is "big-endian" and the other is "little-endian" (I don't remember
which is which)  and this is the root cause of the problem.  Used to
have the same problems as a young lad when moving data between the IBM
mainframe and VAX.

GLH 

-----Original Message-----
From: Ralph Mitchell [mailto:ralphmitchell at gmail.com] 
Sent: Tuesday, February 28, 2006 11:02 PM
To: hobbit at hswn.dk
Subject: Re: [hobbit] Moving to new Hobbit server

On 2/28/06, ZanDAhaR <allan at zandahar.net> wrote:
> Ok cool so basically the graphs stop updating if theyre NQR after the 
> move, I guess thats pretty effortless to test, move a host onto the 
> new box and come back in a day and see what happens I suppose.

I think you could find out sooner than that - just copy an rrd over to
the new system and try to dump it:

     rrdtool dump datafile.rrd

If you get XML, it's probably all good.  If it complains, you need to do
the export at the original host and import it on the new host.  I just
copied an rrd over from a Sparc system to an x86 system, and rrdtool
dump tells me:

   *** glibc detected *** double free or corruption (out): 0x0804a170
***
   Abort

whereas doing the same with a locally-created rrd I get a stream of xml.
Likewise, going back to the original system I can dump the original file
just fine.

Ralph Mitchell

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