On Sat, Feb 5, 2011 at 4:45 AM, ionral <[email protected]> wrote:
> if I check the status of drbd the following response is:
>
> 0: cs: Connected ro: Primary / Primary ds: UpToDate / UpToDate C r ----
> ns: 640864680 nr: 135234784 dw: 776099464 dr: 1520599328 al: 836478 bm:
> 2185 lo: 0 pe: 0 ua: 0 ap: 0 ep: 1 wo: b OOS: 0
>
> I do not know if it is positive that the method is to write after is
> Barrier
> .... reading the manuals of drbd I noticed that in these cases (BBU)
> performance would be better for a wo:n
>
> What do you think?
>
Modify your drbd.conf to look more like:
disk {
on-io-error detach;
# It is good to have backed up write caches
no-disk-barrier;
no-disk-flushes;
no-disk-drain;
no-md-flushes;
use-bmbv;
}
This will completely turn off write ordering which. I have measured
performance gains doing this with backed-up write caches.
-JR
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