Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello, On 12/19/2011 04:06 PM, Volker wrote: > hi, > >>> No, the network link is performing fine syncing at 25MB/s without any >>> problems. >> >> are you saying that your machines are still syncing in the background? > No, theres no (re)sync going on at the moment. I was referring to what > is currently configured as syncer-rate. If the two systems resync after > a disconnect, the full 25MB/s are being used without causing any delay. > > the load on the primary even rises, if the drbd-replication is disabled > while the dd is run. > >> I'd request another brief overview then: >> - which machine ist primary/secondary and synctarget/-source > > the setup is described here: > http://public.blafoo.org/drbd/system-specs.txt > > please notice the 'perftest' logical-volume. doing heavy i/o on that > one, does not cause any harm to the load of the primary OR secondary. > > i've created two top-files while doing the dd. the very first top-output > shows, what the load usually looks like: > > http://public.blafoo.org/drbd/top-primary.txt > http://public.blafoo.org/drbd/top-secondary.txt ok ... still drbd 8.3.8 ... what does "iostat -dx" say during your test? cat /proc/meminfo is unsuspicious? Regards, Andreas -- Need help with DRBD? http://www.hastexo.com/now > > this shows quite clearly what happens. > > to make it complete, here's the current output of > > "drbdsetup /dev/drbd0 show" > http://public.blafoo.org/drbd/current-primary.conf > http://public.blafoo.org/drbd/current-secondary.conf > > >> - what type of network link is in use (you're talking of a switch; no >> good: use a back-to-back connection for optimal performance) > see above schematic. sadly a dedicated connection is not possible > because all the nics are in use (eth0 primary connection, eth1 being > backup and drbd). but see below, the network does not seem to be the > problem. > >> - what network throughput can you achieve with a simple TCP test > about 35-40MB/s > > $ scp test-data.dd root at fallback: > test-data.dd 100% 392MB 39.2MB/s 00:10 > >> - what latencies are you seeing i.e. ping times when idle, ping times >> during dd > idle and while dd'ing: > 64 bytes from fallback.content.domain.de.de (184.108.40.206): icmp_seq=3 > ttl=64 time=0.093 ms > > - volker > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 286 bytes Desc: OpenPGP digital signature URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20111219/db3dcc74/attachment.pgp>