[DRBD-user] drbd performance question

[Сергей Сызько]

Folks!
Is there anybody who knows drbd well enough to help with performance question?
I configured drbd in standalone mode and produced load to drbd device — random 8K writes.
 
iostat shows me, that on drbd device queue is 32 but on the backed device queue is empty.
It looks like drbd is not using queuing and send next write request only after acknowledge.
 
Device            r/s     w/s     rkB/s     wkB/s   rrqm/s   wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util
zd32             0.00 1780.00      0.00  10870.67     0.00     0.00   0.00   0.00    0.00    0.64   1.13     0.00     6.11   0.55  98.53
drbd1            0.00  937.67      0.00   7501.33     0.00     0.00   0.00   0.00    0.00   33.81  31.73     0.00     8.00   1.07  99.97
 
is it possible to enable queue on the drbd’s backed device?
BR
Sergey
 
 
 
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