[DRBD-user] Poor DRBD performance, HELP!

Florian Haas florian.haas at linbit.com
Sat Jun 18 20:27:35 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On 06/17/2011 05:04 PM, Noah Mehl wrote:
> Below is the script I ran to do the performance testing.  I basically took the script from the user guide and removed the oflag=direct,

... which means that dd wrote to your page cache (read: RAM). At this
point, you started kidding yourself about your performance.

> because when it was in there, it brought the performance down to 26MB/s (not really my focus here, but maybe related?).

"Related" doesn't begin to describe it.

Rerun the tests with oflag=direct and then repost them.

Florian

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