<HTML><BODY><div> </div><div>Folks!</div><div>Is there anybody who knows drbd well enough to help with performance question?</div><div>I configured drbd in standalone mode and produced load to drbd device — random 8K writes.</div><div> </div><div>iostat shows me, that on drbd device queue is 32 but on the backed device queue is empty.</div><div>It looks like drbd is not using queuing and send next write request only after acknowledge.</div><div> </div><div><div>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<br>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<br>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</div></div><div> </div><div>is it possible to enable queue on the drbd’s backed device?</div><div>BR</div><div>Sergey</div><div> </div><div> </div><div> </div></BODY></HTML>