[rrd-users] rrdtool on a XFS filesystem

Tobias Oetiker tobi at oetiker.ch
Thu Oct 6 12:18:02 CEST 2011

Hi Christian,

Today Illinger Christian wrote:

> Hello,
> I am new to rrdtool, i have looked a little bit on list archives by saw
> nothing to help me.
> My problem is the following :
> I have rrd files on a XFS file system under Linux 2.6.18 and it seems that
> the date of the rrd files are not changing after an update : the content
> is updated but not the date of the files,
> "> ls -l" command shows no changes, this meen that the modified files
> are not saved in my nightly backup !
> This only happens on XFS filesystems  not on EXT3.
> Is this behaviour normal ?
> Is there some workaround ?
> Thanks for advice.

this is a bug in connection with memory mappped io in the fs code
... rrdtool tries to detect the problem at compile time and will
add code to compensate ...

you can also compile without mmap support to avoid the issue

> Christian
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> rrd-users at lists.oetiker.ch
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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