On Wed, Apr 24 2013, Tim Rohwedder wrote: > Hello, > > i'm getting unexpected results benchmarking our new storages bandwidth running XFS in a DRBD RAID 1 over Ethernet. > > The two peers are connected via DRBD 8.3 on Debian Wheezy x64. > I'm running Fio 2.0.8 > The hardware is a hybrid RAID10 on an adaptec 71605Q. Build of 2x 3TB Seagate Conestellation CS SED and 2x Samsung 840 500GB. > > My jobfile: > [global] > disable_lat=1 > disable_clat=1 > disable_slat=1 > clat_percentiles=0 > direct=1 > buffered=0 > create_on_open=1 > > [randrw] > filename=rand.fio > rw=randrw > size=1g > runtime=180 > stonewall > > [randwrite] > filename=rand.fio > rw=randwrite > size=1g > runtime=180 > stonewall > > [seqwrite] > filename=seq.fio > rw=write > size=2g > runtime=180 > stonewall > > [dualseqwrite] > filename=seq.fio > rw=write > size=2g > numjobs=2 > runtime=180 > stonewall > > [seqread] > filename=seq.fio > rw=read > size=2g > runtime=180 > stonewall > > I'm only measuring the bandwidth. > > The results on the device without drbd are like this: > Randrw: 5564kb/s > Randrwr: 5575kb/s > Randw: 4520kb/s > Write: 74266kb/s > Dualwrite thread1: 44761kb/s > Dualwrite thread2: 44497kb/s > Read: 74619kb/s > > The moment I start DRBD and set the node to primary the highest result is 500-700kb/s on every test. I tried various performance improving tweaks and even asynchronous sync for drbd. > > Is there any way that these results emerge through the combination of fio and drbd? You should probably get in touch with the drbd developers about that, not much I can say about it. This is unlikely to be specific to fio. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
