Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Ok, can you show the output of iostat -x -m 1 during your drbd testcase and, if possible, of your raw raid subsystem?? Look at svctime, await and %cputil, they all help you investigating further. Regards, --matteo Il 20-12-2007 4:09, "Art Age Software" <artagesw at gmail.com> ha scritto: > Hardware RAID-10. There is no problem with the disks. We have measured > raw I/O performance through the RAID on both nodes. > > On Dec 19, 2007 6:16 PM, Matteo Tescione <matteo at rmnet.it> wrote: >> Sorry if already asked, but are you using hardware raid or software raid? If >> so, is it raid 5/6 ? I discovered an huge hole in performance like your >> reports using that kind of setup. Search in the list for previous posts >> about performance solved. >> >> Regards, >> >> -- >> #Matteo Tescione >> #RMnet srl >> >> Il 20-12-2007 1:41, "Art Age Software" <artagesw at gmail.com> ha scritto: >> >> >>> I have run some additional tests: >>> >>> 1) Disabled bonding on the network interfaces (both nodes). No >>> significant change. >>> >>> 2) Changed the DRBD communication interface. Was using a direct >>> crossover connection between the on-board NICs of the servers. I >>> switched to Intel Gigabit NIC cards in both machines, connecting >>> through a Gigabit switch. No significant change. >>> >>> 3) Ran a file copy from node1 to node2 via scp. Even with the >>> additional overhead of scp, I get a solid 65 MB/sec. throughput. >>> >>> So, at this stage I have seemingly ruled out: >>> >>> 1) Slow IO subsystem (both machines measured and check out fine). >>> >>> 2) Bonding driver (additional latency) >>> >>> 3) On-board NICs (hardware/firmware problem) >>> >>> 4) Network copy speed. >>> >>> What's left? I'm stumped as to why DRBD can only do about 3.5 BM/sec. >>> on this very fast hardware. >>> >>> Sam >> >>> _______________________________________________ >>> drbd-user mailing list >>> drbd-user at lists.linbit.com >>> http://lists.linbit.com/mailman/listinfo/drbd-user >>> >> >> >> > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user >