Can you post the fio results with the ioengine using libaio? From what you posted, it seems to me that the read test hit cache. And the write performance was not good, the latency was too high (~35.4ms) while the numjobs and iodepth both were 1. Did you monitor system stat on both side (VM/Compute Node and Cluster)? ------------------ Original ------------------ From: "Tony Liu";<tonyliu0592@xxxxxxxxxxx>; Date: Sep 15, 2020 To: "ceph-users"<ceph-users@xxxxxxx>; Subject: benchmark Ceph Hi, I have a 3-OSD-node Ceph cluster with 1 480GB SSD and 8 x 2TB 12Gpbs SAS HDD on each node, to provide storage to a OpenStack cluster. Both public and cluster networks are 2x10G. WAL and DB of each OSD is on SSD and they share the same 60GB partition. I run fio with different combinations of operation, block size and io-depth to collect IOPS, bandwidth and latency. I tried fio on compute node with ioengine=rbd, also fio within VM (backed by Ceph) with ioengine=libaio. The result doesn't seem good. Here are couple examples. ==================================== fio --name=test --ioengine=rbd --clientname=admin \ --pool=benchmark --rbdname=test --numjobs=1 \ --runtime=30 --direct=1 --size=2G \ --rw=read --bs=4k --iodepth=1 test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=rbd, iodepth=1 fio-3.7 Starting 1 process Jobs: 1 (f=0): [f(1)][100.0%][r=27.6MiB/s,w=0KiB/s][r=7075,w=0 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=56310: Mon Sep 14 19:01:24 2020 read: IOPS=7610, BW=29.7MiB/s (31.2MB/s)(892MiB/30001msec) slat (nsec): min=1550, max=57662, avg=3312.74, stdev=2981.42 clat (usec): min=77, max=4799, avg=127.39, stdev=39.88 lat (usec): min=78, max=4812, avg=130.70, stdev=40.67 clat percentiles (usec): | 1.00th=[ 82], 5.00th=[ 86], 10.00th=[ 95], 20.00th=[ 98], | 30.00th=[ 100], 40.00th=[ 104], 50.00th=[ 116], 60.00th=[ 129], | 70.00th=[ 141], 80.00th=[ 157], 90.00th=[ 182], 95.00th=[ 198], | 99.00th=[ 233], 99.50th=[ 245], 99.90th=[ 359], 99.95th=[ 515], | 99.99th=[ 709] bw ( KiB/s): min=27160, max=40696, per=100.00%, avg=30474.29, stdev=2826.23, samples=59 iops : min= 6790, max=10174, avg=7618.56, stdev=706.56, samples=59 lat (usec) : 100=28.89%, 250=70.72%, 500=0.34%, 750=0.05%, 1000=0.01% lat (msec) : 2=0.01%, 10=0.01% cpu : usr=3.55%, sys=3.80%, ctx=228358, majf=0, minf=29 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=228333,0,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=1 Run status group 0 (all jobs): READ: bw=29.7MiB/s (31.2MB/s), 29.7MiB/s-29.7MiB/s (31.2MB/s-31.2MB/s), io=892MiB (935MB), run=30001-30001msec Disk stats (read/write): dm-0: ios=290/3, merge=0/0, ticks=2427/19, in_queue=2446, util=0.95%, aggrios=290/4, aggrmerge=0/0, aggrticks=2427/39, aggrin_queue=2332, aggrutil=0.95% sda: ios=290/4, merge=0/0, ticks=2427/39, in_queue=2332, util=0.95% ==================================== ==================================== fio --name=test --ioengine=rbd --clientname=admin \ --pool=benchmark --rbdname=test --numjobs=1 \ --runtime=30 --direct=1 --size=2G \ --rw=write --bs=4k --iodepth=1 test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=rbd, iodepth=1 fio-3.7 Starting 1 process Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=6352KiB/s][r=0,w=1588 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=56544: Mon Sep 14 19:03:36 2020 write: IOPS=1604, BW=6417KiB/s (6571kB/s)(188MiB/30003msec) slat (nsec): min=2240, max=45925, avg=6526.95, stdev=3486.19 clat (usec): min=399, max=35411, avg=615.88, stdev=231.41 lat (usec): min=402, max=35421, avg=622.40, stdev=232.08 clat percentiles (usec): | 1.00th=[ 420], 5.00th=[ 449], 10.00th=[ 469], 20.00th=[ 498], | 30.00th=[ 529], 40.00th=[ 562], 50.00th=[ 611], 60.00th=[ 652], | 70.00th=[ 685], 80.00th=[ 709], 90.00th=[ 766], 95.00th=[ 799], | 99.00th=[ 881], 99.50th=[ 955], 99.90th=[ 2671], 99.95th=[ 3097], | 99.99th=[ 3785] bw ( KiB/s): min= 5944, max= 6792, per=100.00%, avg=6415.95, stdev=178.72, samples=60 iops : min= 1486, max= 1698, avg=1603.93, stdev=44.67, samples=60 lat (usec) : 500=20.82%, 750=67.23%, 1000=11.55% lat (msec) : 2=0.25%, 4=0.14%, 10=0.01%, 20=0.01%, 50=0.01% cpu : usr=1.22%, sys=1.25%, ctx=48143, majf=0, minf=18 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=0,48129,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=1 Run status group 0 (all jobs): WRITE: bw=6417KiB/s (6571kB/s), 6417KiB/s-6417KiB/s (6571kB/s-6571kB/s), io=188MiB (197MB), run=30003-30003msec Disk stats (read/write): dm-0: ios=31/2, merge=0/0, ticks=342/14, in_queue=356, util=0.12%, aggrios=33/3, aggrmerge=0/0, aggrticks=390/27, aggrin_queue=404, aggrutil=0.13% sda: ios=33/3, merge=0/0, ticks=390/27, in_queue=404, util=0.13% ==================================== Does that make sense? How do you benchmark your Ceph cluster? Appreciate if you could share your experiences here. Thanks! Tony _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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