Hi,
I'm using ceph nautilus for openstack, I found an odd problem(or a bug?)
while turn on the rbd cache:
1. run a rbd read bench
rbd -c /etc/ceph/ceph.conf -k /etc/ceph/keyring2 -n
client.rbd-openstack-002 bench \
--io-size 4K \
--io-threads 1 \
--io-pattern rand \
--io-type read \
--io-total 100G \
openstack-volumes/image1
bench type read io_size 4096 io_threads 1 bytes 107374182400 pattern random
SEC OPS OPS/SEC BYTES/SEC
1 180 176.75 723985.61
2 369 185.37 759263.46
3 581 194.26 795669.09
4 742 184.27 754778.64
2. run another test for write(the same host or not)
rbd -n client.rbd-openstack-002 -c /etc/ceph/ceph.conf -k
/etc/ceph/keyring.rbd-openstack-002 bench \
--io-size 4K \
--io-threads 1 \
--io-pattern rand \
--io-type write \
--io-total 100G \
openstack-volumes/image2
3. waiting for seconds, check the read ops:
bench type read io_size 4096 io_threads 1 bytes 107374182400 pattern random
SEC OPS OPS/SEC BYTES/SEC
1 140 137.16 561794.28
2 249 125.50 514046.00
3 384 128.16 524942.96
10 432 39.83 163128.47
11 435 39.48 161700.52
12 457 28.86 118208.87
25 473 9.38 38414.24
26 483 4.30 17621.06
29 494 3.42 14005.46
30 536 5.33 21828.19
31 555 5.16 21144.12
33 558 10.77 44114.68
34 576 11.22 45938.31
36 591 12.20 49987.93
37 601 9.29 38055.28
The read op is blocked by write? I think it should not be reasonable.
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