[rrd-users] buffers flush every midnight
kuleshov at org.vrn.ru
Thu Oct 30 12:32:29 CET 2008
On Thu, 30 Oct 2008 09:39:21 +0100 (CET)
Tobias Oetiker <tobi at oetiker.ch> wrote:
> if you have an RRA storing daily values, then this is bound to get
> updated at midnight GMT ...
Yes, I have. Typical rrd created like this:
> this will use more memory as more diskblocks go to cache
> and it will cause a lot of disk activity as the data blocks get
> read in for the updates.
You seem to be right... Two-hour values computation is slightly slowed
down too. Not that critical, but noticeably.
One unexplained thing is that 'Buffers' values decreases, but not
'Cached'. As far as I know, in modern kernels 'Buffers' shows amount of
RAM allocated for file-system metadata cache and actual content stored
in 'Cached' memory.
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