I'm doing some fio tests on Giant using fio rbd driver to measure
performance on a new ceph cluster.
However with block sizes > 1M (initially noticed with 4M) I am seeing
absolutely no IOPS for *reads* - and the fio process becomes non
interrupteable (needs kill -9):
$ ceph -v
ceph version 0.86-467-g317b83d (317b83dddd1a917f70838870b31931a79bdd4dd0)
$ fio --version
fio-2.1.11-20-g9a44
$ fio read-busted.fio
env-read-4M: (g=0): rw=read, bs=4M-4M/4M-4M/4M-4M, ioengine=rbd, iodepth=32
fio-2.1.11-20-g9a44
Starting 1 process
rbd engine: RBD version: 0.1.8
Jobs: 1 (f=1): [R(1)] [inf% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta
1158050441d:06h:58m:03s]
This appears to be a pure fio rbd driver issue, as I can attach the
relevant rbd volume to a vm and dd from it using 4M blocks no problem.
Any ideas?
Cheers
Mark
[global]
ioengine=rbd
clientname=admin
pool=rbd
rbdname=rbd-fio-test
invalidate=0
iodepth=32
nrfiles=1
runtime=120
direct=1
sync=1
unlink=1
numjobs=1
thread=0
disk_util=0
[env-read-4M]
bs=4M
rw=read
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