Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Am Donnerstag, 13. Januar 2005 12:14 schrieb Lars Marowsky-Bree:
> On 2005-01-13T11:50:30, Philipp Reisner <philipp.reisner at linbit.com> wrote:
>
> Hi Philipp, interesting numbers, thanks!
>
> > A hint where we loose are the numbers from writing on DRBD
> > in disconnected mode:
>
> How much overhead goes into keeping the active log etc uptodate? Is the
> performance disk IO-, network IO- or CPU-limitted?
>
Ahhh, right. I had the AL at its default setting, so there were updates
to the AL, because I wrote 3G in my tests...
Now I changed the AL setting:
syncer {
rate 14M;
group 2;
al-extents 1009;
}
Now the "al:" value stays constant during a test....
43.25 MB/sec (3221225472 B / 01:11.033546)
44.91 MB/sec (3221225472 B / 01:08.403583)
44.79 MB/sec (3221225472 B / 01:08.585322)
Raw write performance to the LVs:
59.69 MB/sec (3221225472 B / 00:51.468961)
60.54 MB/sec (3221225472 B / 00:50.743192)
60.71 MB/sec (3221225472 B / 00:50.603030)
So, when the working set stays constant, we now we reach 75% of the raw
LVs performance ... with these machines.
-Philipp
--
: Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH Fax +43-1-8178292-82 :
: Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :