Hi,
As mentioned in my previous emails, I'm extremely new to ceph, so please
forgive my lack of knowledge.
I'm trying to find a good way to mount ceph rbd images for export by
LIO/targetcli
rbd-nbd isn't good as it stops at 16 block devices (/dev/nbd0-15)
kernel rbd mapping doesn't have support for new features.
I thought rbd-fuse looked good, except write performance is abysmal.
rados bench gives me ~250MB/s of write speed. an image mounted with
rbd-fuse gives me ~2MB/s of write speed. CephFS write speeds are good as
well.
Is something wrong with my testing method or configuration?
root@stor-vm1:/# ceph osd pool create rbd_storage 128 128
root@stor-vm1:/# rbd create --pool=rbd_storage --size=25G rbd_25g1
root@stor-vm1:/# mkdir /mnt/rbd
root@stor-vm1:/# cd /mnt
root@stor-vm1:/# rbd-fuse rbd -p rbd_storage
root@stor-vm1:/# cd rbd
root@stor-vm1:/# dd if=/dev/zero of=rbd_25g1 bs=4M count=2 status=progress
8388608 bytes (8.4 MB, 8.0 MiB) copied, 4.37754 s, 1.9 MB/s
2+0 records in
2+0 records out
8388608 bytes (8.4 MB, 8.0 MiB) copied, 4.3776 s, 1.9 MB/s
rados bench:
root@stor-vm1:/mnt/rbd# rados bench -p rbd_storage 10 write
2017-06-27 18:56:59.505647 7fb9c24a7e00 -1 WARNING: the following dangerous
and experimental features are enabled: bluestore
2017-06-27 18:56:59.505768 7fb9c24a7e00 -1 WARNING: the following dangerous
and experimental features are enabled: bluestore
2017-06-27 18:56:59.507385 7fb9c24a7e00 -1 WARNING: the following dangerous
and experimental features are enabled: bluestore
hints = 1
Maintaining 16 concurrent writes of 4194304 bytes to objects of size
4194304 for up to 10 seconds or 0 objects
Object prefix: benchmark_data_stor-vm1_8786
sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
lat(s)
0 0 0 0 0 0 -
0
1 16 63 47 187.989 188 0.620617
0.285428
2 16 134 118 235.976 284 0.195319
0.250789
3 16 209 193 257.306 300 0.198448
0.239798
4 16 282 266 265.972 292 0.232927
0.233386
5 16 362 346 276.771 320 0.222398
0.226373
6 16 429 413 275.303 268 0.193111
0.226703
7 16 490 474 270.828 244 0.0879974
0.228776
8 16 562 546 272.97 288 0.125843
0.230455
9 16 625 609 270.637 252 0.145847
0.232388
10 16 701 685 273.97 304 0.411055
0.230831
Total time run: 10.161789
Total writes made: 702
Write size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 276.329
Stddev Bandwidth: 38.1925
Max bandwidth (MB/sec): 320
Min bandwidth (MB/sec): 188
Average IOPS: 69
Stddev IOPS: 9
Max IOPS: 80
Min IOPS: 47
Average Latency(s): 0.231391
Stddev Latency(s): 0.107305
Max latency(s): 0.774406
Min latency(s): 0.0828756
Cleaning up (deleting benchmark objects)
Removed 702 objects
Clean up completed and total clean up time :1.190687
Thanks,
Dan
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