Thank you Gianni. I tried to ask on the mailing list first because if I try to write on the backing device, probably I need to resync drbd device when the cluster goes up again. Anyway, I will send tests on /dev/sdb as soon as possible. Thank you
Il Lun 6 Mag 2019, 13:20 Gianni Milo <gianni.mil...@gmail.com> ha scritto: > I would do same tests on the backing storage first, without drbd, cluster > management or any other complexity involved. Then after confirming that > there's no any kind of bottleneck there, I would slowly move to the "upper > layers" ... > > > > On Mon, 6 May 2019 at 09:49, Marco Marino <marino....@gmail.com> wrote: > >> Hello, I'm using drbd 8.4.11 on a two node cluster on top of centos 7. >> Both servers have the same hardware configuration: same cpu, ram, >> disks,...More precisely there is a Megaraid lsi SAS 9361-8i with a raid5 >> volume. CacheCade is enabled for both controllers and I have a raid0 volume >> with 4x256GB SSD disks. >> I'm trying to do same test with fio: >> >> fio --filename=/dev/mapper/vg1-vol2 --direct=1 --rw=randrw >> --refill_buffers --norandommap --randrepeat=0 --ioengine=libaio --bs=16k >> --rwmixread=30 --iodepth=32 --numjobs=32 --runtime=60 --group_reporting >> --name=16k7030test >> >> On node 1 I have: >> >> Run status group 0 (all jobs): >> READ: bw=259MiB/s (272MB/s), 259MiB/s-259MiB/s (272MB/s-272MB/s), >> io=15.2GiB (16.3GB), run=60021-60021msec >> WRITE: bw=605MiB/s (635MB/s), 605MiB/s-605MiB/s (635MB/s-635MB/s), >> io=35.5GiB (38.1GB), run=60021-60021msec >> >> I'm doing the test after this command: >> pcs cluster standby --> on node 2. So, there are no write through the >> replication network and I can test the effective speed of the disk >> >> if I try to do the same thing from node2 I have a degraded performance: >> Run status group 0 (all jobs): >> READ: bw=101MiB/s (105MB/s), 101MiB/s-101MiB/s (105MB/s-105MB/s), >> io=6039MiB (6332MB), run=60068-60068msec >> WRITE: bw=234MiB/s (245MB/s), 234MiB/s-234MiB/s (245MB/s-245MB/s), >> io=13.7GiB (14.7GB), run=60068-60068msec >> >> >> Someone can give me an advice? Why this happens? I repeat: there is the >> same configuration on both servers. I can check any parameter and I can >> give more details if needed. >> >> Thank you >> >> _______________________________________________ >> drbd-user mailing list >> drbd-user@lists.linbit.com >> http://lists.linbit.com/mailman/listinfo/drbd-user >> >
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